CBSE Class 12 Chemistry 2024

What 2024 actually asked, chapter by chapter

Marks we counted in the 2024 papers themselves. CBSE allocates marks per unit, not per chapter — this is what was observed, not an official CBSE weightage.

All 308 questions from 2024

• Q1The molar ionic conductivities of Ca^2+ and Cl^- are 119.0 and 76.3 S cm^2 mol^-1 respectively. The value of limiting…1 mk
• Q1The product of oxidation of SO 3^2- with MnO 4^- in acidic medium is:1 mk
• Q1The molar ionic conductivities of Al^3+ and SO 4^2- are 189 S cm^2 mol^-1 and 160 S cm^2 mol^-1 respectively. The value…1 mk
• Q1Van't Hoff factor for K 2 SO 4 solution, assuming complete ionization is1 mk
• Q1The specific sequence in which amino acids are arranged in a protein is called its1 mkasked 4×
• Q1The most stable oxidation state of Iron is:1 mk
• Q1Which one of the following first row transition elements is expected to have the highest third ionization enthalpy?1 mk
• Q1Which of the following ligands is an ambidentate ligand?1 mk
• Q1The correct order for the increasing oxidizing power in 3d series of transition elements is:1 mk
• Q1Which of the following does not show variable oxidation states?1 mk
• Q1The equilibrium Cr 2 O 7^2- 2 CrO 4^2-:1 mk
• Q1When MnO 2 is fused with KOH in air, it gives:1 mk
• Q1The molar ionic conductivities of Mg^2+ and SO 4^2- are 106.0 S cm^2 mol^-1 and 160.0 S cm^2 mol^-1 respectively. The…1 mk
• Q1Which of the following ligands can show linkage isomerism in a coordination compound?1 mk
• Q2Ligand EDTA ^4- is an example of a:1 mk
• Q2The coordination number of Co in [Co(en) 3]^3+ is:1 mk
• Q2Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO 3)?1 mk
• Q2Which of the following is the strongest acid?1 mk
• Q2Consider the following reaction: Identify A and B from the given options:1 mkasked 3×
• Q2On adding AgNO 3 solution to 1 mole of complex NiCl 2 · 4 NH 3, two moles of AgCl are formed. The secondary valency of…1 mk
• Q2The product formed as a result of reaction of CH 3 MgBr and CO 2 followed by hydrolysis is:1 mk
• Q2The correct name of the given reaction is Ar-N 2^+ X^- Cu CN / KCN Ar-CN+N 21 mkasked 2×
• Q2On adding AgNO 3 solution to 1 mole of CoCl 3 · 4 NH 3, one mole of AgCl is precipitated. The secondary valency of Co…1 mk
• Q2The type of isomerism shown by the complex [CoCl 2(en) 2]^+ is:1 mkasked 2×
• Q3Which one of the following hybrid states is associated with low spin complex?1 mk
• Q3Maltose is made up of:1 mk
• Q3Which of the following is diamagnetic in nature?1 mk
• Q3Two among the three components of DNA are β -D-2-deoxyribose and a heterocyclic base. The third component is:1 mk
• Q3Which of the following acids represents Vitamin C?1 mkasked 3×
• Q3Which of the following elements of 3d series of transition elements has the lowest Δ a H^0?1 mk
• Q3Transition elements form alloys easily because they have:1 mk
• Q3Which one of the following complexes is non-ionisable?1 mk
• Q3Out of the following alkenes, the one which will produce tertiary butyl alcohol on acid catalysed hydration is1 mkasked 2×
• Q3Which of the following ligand forms chelate complex?1 mk
• Q3Nucleotides are composed of a:1 mk
• Q4Consider the following reaction: The major product of the reaction is:1 mk
• Q4Consider the following reaction: The major product obtained is:1 mk
• Q4Consider the following reaction: The major product obtained is:1 mk
• Q4The system that forms maximum boiling azeotrope is:1 mk
• Q4For an electrolyte undergoing association in a solvent, the van't Hoff factor:1 mk
• Q4Auto-oxidation of chloroform in air and light produces a poisonous gas known as1 mkasked 3×
• Q4Rosenmund reduction is used for the preparation of Aldehydes. The catalyst used in this reaction is1 mkasked 3×
• Q4Butanenitrile may be prepared by heating:1 mk
• Q4Which of the following contains sp^2 hybridised carbon bonded to X?1 mk
• Q4Which of the following is a benzylic halide?1 mk
• Q5Phenol dimerises in benzene having van't Hoff factor 0 · 54. Its degree of association is:1 mk
• Q5Which of the following is most acidic?1 mkasked 2×
• Q5Phenol is less acidic than:1 mk
• Q5Which alkyl halide from the given options will undergo S N 1 reaction faster?1 mkasked 3×
• Q5A zero-order reaction is one whose rate is independent of:1 mk
• Q5Which one of the following compounds has the highest pK a value?1 mk
• Q5Transition metals are known to make interstitial compounds. Formation of interstitial compounds makes the transition…1 mkasked 3×
• Q5For the reaction X+2 Y → P, the differential form equation of the rate law is:1 mk
• Q5Which one of the following compounds has the lowest pK a value?1 mk
• Q5Which of the following Grignard reagent will be used with methanal to prepare1 mk
• Q6A reaction A 2+B 2 → 2 AB occurs by the following mechanism: Its order would be:1 mk
• Q6(CH 3) 3 C-O-CH 3 reacts with HI to give:1 mk
• Q6The compound which undergoes S N 1 reaction most rapidly is:1 mk
• Q6Isotonic solutions have the same1 mkasked 3×
• Q6From the elements of 3d series given below, which element shows the maximum number of oxidation states?1 mkasked 3×
• Q6CH 3-O-CH 3 when treated with excess HI gives:1 mk
• Q6(CH 3) 2 CH-O-CH 3 when treated with HI gives:1 mk
• Q6(CH 3) 2 CH-O-CH 3 reacts with HI to give:1 mk
• Q6The correct name of the given reaction is Ar-N 2^+ X^- [ Cu powder ]HBr Ar-Br+N 2.1 mk
• Q6Anisole reacts with HI to give:1 mk
• Q6C 6 H 5-O-CH 3 when treated with HI gives:1 mk
• Q7Which of the following cell was used in Apollo space programme?1 mk
• Q7Which of the following is most reactive towards nucleophilic substitution reaction?1 mk
• Q7Decarboxylation of sodium benzoate on heating with soda lime gives:1 mk
• Q7In effective collisions the colliding molecules must have:1 mk
• Q7Ethanol on heating with conc. H 2 SO 4 at 413 K gives:1 mk
• Q7Which of the following compounds on treatment with benzene sulphonyl choride forms product insoluble in alkali?1 mk
• Q7The fraction of molecules having energy equal to or greater than activation energy is:1 mk
• Q7The correct Mathematical expression of Arrhenius equation is1 mk
• Q7Aspirin is formed by the acetylation of:1 mk
• Q7Acetic acid reacts with PCl 5 to give:1 mk
• Q7A compound (X) with the molecular formula C 3 H 8 O can be oxidized by strong oxidizing agents to another compound (Y)…1 mk
• Q7Visha took 4 text-tubes namely A, B, C & D containing CH 3 CH=CH 2, CH 3 CH 2 CH=CH 2, CH 3 CH=CH-CH 3 and (CH 3) 2…1 mk
• Q7Which of the following compounds will not react with benzene sulphonyl chloride?1 mk
• Q7Which of the following compounds on treatment with benzene sulphonyl choride forms an alkali-soluble precipitate?1 mk
• Q8Identify the primary amine from the given options:1 mk
• Q8Identify the secondary amine from the given options:1 mk
• Q8Identify the tertiary amine from the following:1 mk
• Q8Van't Hoff factor for KCl solution assuming the complete dissociation is1 mk
• Q8Which of the following amines gives carbylamine reaction?1 mk
• Q8The product (X) obtained in the following reaction is:1 mk
• Q8An azeotropic solution of two liquids has boiling point higher than either of them when it:1 mk
• Q8The order of increasing basicities of CH 3 NH 2(I),(CH 3) 2 NH(II), (CH 3) 3 N (III) and C 6 H 5 NH 2 (IV) in aqueous…1 mk
• Q8The rate of a reaction increases sixteen times when the concentration of the reactant increases four times. The order…1 mkasked 2×
• Q8An azeotropic solution of two liquids has boiling point lower than either of them when it:1 mk
• Q8The formation of cyanohydrin from an aldehyde is an example of:1 mk
• Q8'Scurvy' is caused by the deficiency of vitamin:1 mk
• Q8The IUPAC name of is:1 mk
• Q8On mixing 10 mL of acetone with 50 mL of chloroform, the total volume of the solution will be:1 mk
• Q9Dehydration of tertiary alcohols with Cu at 573 K gives:1 mk
• Q9The unit of cell constant is:1 mk
• Q9Which of the following has the highest boiling point?1 mk
• Q9The vitamin which plays an important role in coagulating blood is:1 mk
• Q9The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0225. The mole…1 mkasked 3×
• Q9Nucleophilic addition of Grignard reagent to ketones followed by hydrolysis with dilute acids forms:1 mkasked 3×
• Q9In the Arrhenius equation, when log k is plotted against 1/T, a straight line is obtained whose:1 mkasked 3×
• Q9During electrolysis of aqueous CuCl 21 mk
• Q9'Night-Blindness' is caused by the deficiency of Vitamin:1 mk
• Q10In a given graph of zero order reaction, the slope and intercept are:1 mkasked 3×
• Q10Which of the following species can act as the strongest base?1 mkasked 3×
• Q10Which of the following cell is used in inverter?1 mk
• Q10During electrolysis of aqueous solution of NaCl:1 mk
• Q10The reaction of an alkyl halide with sodium alkoxide forming ether is known as:1 mk
• Q10For a certain reaction R → products, a plot of log [R] vs. time gives a straight line with a slope of -1 · 25 s^-1. The…1 mk
• Q10Half-life period of a first order reaction is 1386 seconds. The rate constant (k) of the reaction is:1 mk
• Q10When a catalyst increases the rate of a chemical reaction, then the rate constant (k):1 mk
• Q10The half life of a first order reaction with rate constant (k) of 3 min^-1 is:1 mk
• Q10Phenol does not undergo nucleophilic substitution reaction easily due to:1 mk
• Q11Which of the following cells is used in hearing aids?1 mkasked 2×
• Q11Match the reagents required for the given reactions: I. Oxidation of primary alcohols to (p) NaBH 4 aldehydes II.…1 mkasked 3×
• Q11For a zero order reaction A → products, t 1 / 2 is:1 mk
• Q11The suitable Grignard reagent used for the synthesis of CH 3-CH-CH 2-OH with methanal is:1 mk
• Q11The correct order of the ease of dehydration of the following alcohols by the action of conc. H 2 SO 4 is:1 mk
• Q11The addition of catalyst during a chemical reaction alters which of the following quantities of the reaction?1 mk
• Q11Phenol on reaction with aqueous bromine at room temperature gives:1 mk
• Q11A 1% solution of solute 'X' is isotonic with a 6% solution of sucrose (molar mass =342 g mol^-1 ). The molar mass of…1 mkasked 3×
• Q11When the initial concentration of a reactant is doubled in the reaction, the half life period remains same. The order…1 mk
• Q11In which of the following molecules, C atom marked with asterisk is chiral? (I) (II) (III) (IV)1 mkasked 3×
• Q11Dilution affects both conductivity as well as molar conductivity. Effect of dilution on both is as follows:1 mkasked 2×
• Q12During the electrolysis of aqueous NaCl, the cathodic reaction is:1 mk
• Q12The rate of the reaction 2 A+B 2 → 2 AB is given by Rate =k[A]^2[ B 2]. The value of rate constant (k) can be increased…1 mk
• Q12The general electronic configuration of d-block elements is:1 mkasked 3×
• Q12Which functional groups of glucose interact to form cyclic hemiacetal leading to pyranose structure?1 mk
• Q12All proteins on hydrolysis give:1 mk
• Q12Aniline on reaction with Bromine water gives:1 mk
• Q12Van't Hoff factor for Na 2 SO 4 · 10 H 2 O solution, assuming complete ionization is1 mk
• Q12For the reaction A+2 B → C+D. The order of the reaction is1 mk
• Q12For the elementary reaction P → Q, the rate of disappearance of 'P' increases by a factor of 8 upon doubling the…1 mk
• Q12Which of the following is a secondary cell?1 mk
• Q13Assertion: Aliphatic primary amines can be prepared by Gabriel phthalimide synthesis. Reason (R): Alkyl halides undergo…1 mk
• Q13Assertion: p-nitrophenol is less acidic than phenol. Reason (R): Nitro group is electron withdrawing and helps in the…1 mk
• Q13Assertion: Zr and Hf are of almost similar atomic radii. Reason (R): This is due to Lanthanoid contraction.1 mkasked 3×
• Q13Assertion: Fluoroacetic acid is stronger acid than chloroacetic acid. Reason (R): This is due to greater electron…1 mk
• Q13Assertion: Addition of ethylene glycol to water lowers its freezing point. Reason (R): Ethylene glycol is insoluble in…1 mk
• Q13Assertion: Aniline is a weaker base than cyclohexylamine ( -NH 2 ). Reason (R): Aniline is resonance stabilized.1 mk
• Q13Assertion: Phenols are stronger acids than alcohols. Reason (R): Alkoxide ion is more stable than phenoxide ion.1 mk
• Q13Assertion: Bromination of Phenol can be carried out even in the absence of Lewis acid. Reason (R): - OH group of Phenol…1 mk
• Q13Assertion: When NaCl is added to water a depression in freezing point is observed. Reason (R): NaCl undergoes…1 mk
• Q13Assertion: Δ mix H and Δ mix V are zero for an ideal solution. Reason (R): The solution which obeys Raoult's law over…1 mk
• Q13Assertion: Aromatic primary amines can be prepared by Gabriel phthalimide synthesis. Reason (R): Alkyl halide undergoes…1 mk
• Q13Assertion: Δ mix H and Δ mix V are zero for non-ideal solutions. Reason (R): Solute-solvent interactions are not same…1 mk
• Q14Assertion: Benzoic acid does not undergo Friedel - Crafts reaction. Reason (R): Carboxyl group is deactivating and the…1 mkasked 3×
• Q14Assertion: Uracil base is present in DNA. Reason (R): DNA undergoes self-replication.1 mk
• Q14Assertion: Order of reaction and molecularity are always same for complex reactions. Reason (R): Order is determined…1 mk
• Q14Assertion: Rate of reaction increases with increase in temperature. Reason (R): Number of effective collisions increase…1 mk
• Q14Assertion: The pK a of O 2 N-CH 2-COOH is lower than that of CH 3-COOH. Reason (R): -NO 2 group shows electron…1 mk
• Q14Assertion: Vitamin C cannot be stored in our body. Reason (R): Vitamin C is water soluble and readily excreted in urine.1 mkasked 2×
• Q14Assertion: Rate of reaction decreases with increase in temperature. Reason (R): Number of effective collisions…1 mk
• Q14Assertion: Separation of Zr and Hf is difficult. Reason (R): Zr and Hf have similar radii due to lanthanoid contraction.1 mk
• Q14Assertion: Uracil base is present in RNA. Reason (R): RNA undergoes self-replication.1 mk
• Q14Assertion: p -nitroaniline is a weaker base than p -toluidine. Reason(R): The electron donating -NO 2 group in p…1 mk
• Q15Assertion: Ammonolysis of alkyl halides involves reaction between alkyl halide and ethanolic solution of ammonia.…1 mk
• Q15Assertion: Δ mix H for an ideal solution is not equal to zero. Reason (R): A - B interactions in an ideal solution are…1 mk
• Q15Assertion: Phenol on reaction with aqueous NaOH gives sodium phenoxide. Reason (R): This reaction supports the acidic…1 mk
• Q15Assertion: Diazonium salts of aromatic amines are more stable than those of aliphatic amines. Reason (R): Diazonium…1 mk
• Q15Assertion: Inversion of configuration is observed in S N 2 reaction. Reason (R): The reaction proceeds with the…1 mkasked 2×
• Q15Assertion: The boiling point of ethanol is higher than that of dimethyl ether. Reason (R): Dimethyl ether molecules are…1 mk
• Q15Assertion: Transition metals have high enthalpy of atomization. Reason (R): This is because transition metals have low…1 mk
• Q15Assertion: Diazonium salts of aliphatic amines are more stable than those of aromatic amines. Reason (R): Diazonium…1 mk
• Q15Assertion: The pK a of ethanoic acid is lower than that of Cl-CH 2-COOH. Reason (R): Chlorine shows electron…1 mk
• Q15Assertion: p-methoxyphenol is a stronger acid than m-methoxy phenol. Reason (R): Methoxy group exerts +R effect at both…1 mk
• Q15Assertion: Fructose is a reducing sugar. Reason (R): Fructose does not reduce Fehling solution and Tollen's reagent.1 mkasked 3×
• Q15Assertion: The boiling point of ethanol is higher than that of dimethyl ether. Reason (R): Ethanol molecules are…1 mk
• Q16Assertion: Aniline is a stronger base than ammonia. Reason (R): The unshared electron pair on nitrogen atom in aniline…1 mkasked 2×
• Q16Assertion: Aniline does not undergo Friedel-Crafts reaction. Reason (R): Friedel-Crafts reaction is a nucleophilic…1 mk
• Q16Assertion: Separation of Zr and Hf is difficult. Reason (R): Zr and Hf are radioactive.1 mk
• Q16Assertion: Aniline does not undergo Friedel-Crafts reaction. Reason (R): Friedel-Crafts reaction is an electrophilic…1 mk
• Q16Assertion: When NaCl is added in water, elevation in boiling point is observed. Reason (R): Elevation in boiling point…1 mk
• Q16Assertion: p-methoxyphenol is a stronger acid than p-nitrophenol. Reason (R): Methoxy group shows +I effect whereas…1 mkasked 2×
• Q16Assertion: Aniline undergoes Friedel-Crafts reaction. Reason (R): Aniline forms salt with AlCl 3, the Lewis acid in…1 mk
• Q16Assertion: Boiling point of butan-1-ol is higher than that of butan-1-amine. Reason (R): Being more polar, butan-1-ol…1 mk
• Q16Assertion: Inversion of configuration is observed when 1-Bromobutane is hydrolysed. Reason (R): The reaction is S N 2…1 mk
• Q16Assertion: For a Daniell cell, Zn / Zn^2+(1 M) Cu^2+(1 M) / Cu with E^° cell =1.1 V, if the external opposing potential…1 mkasked 3×
• Q16Assertion: p -nitroaniline is a weaker base than p -toluidine. Reason (R): The electron withdrawing effect of -NO 2…1 mk
• Q16Assertion: Acetanilide ( -NHCOCH 3 ) is less basic than aniline. Reason (R): Acetylation of aniline results in decrease…1 mkasked 3×
• Q17Write the reactions of glucose with: H 2 N-OH Br 2 water2 mk
• Q17A 6% solution of glucose (molar mass=180 g mol^-1 ) is isotonic with 2.5% solution of an unknown organic substance.…2 mk
• Q17Define molal depression constant. How is it related to enthalpy of fusion? OR What type of deviation is shown by…2 mkasked 3×
• Q17Define the following terms: Faraday's second law of electrolysis Corrosion2 mk
• Q17What happens when D-glucose is treated with the following reagents? H 2 N-OH (CH 3 CO) 2 O2 mk
• Q17Define the following terms: Order of a reaction Activation energy 1 × 22 mk
• Q17Calculate the potential of Iron electrode in which the concentration of Fe^2+ ion is 0.01 M. ( E^0 Fe^2+ / Fe=-0.45 V…2 mkasked 3×
• Q17Write the reactions of glucose with: HI (CH 3 CO) 2 O2 mk
• Q17Define the following terms: Molecularity of reaction Complex reaction2 mk
• Q17Define the following terms: Half life period (t 1 / 2) Effective collisions2 mk
• Q17Define the following terms: Essential amino acids Nucleotide2 mk
• Q17Which one of the following pairs of substances undergoes S N 1 reaction faster and why? CH 3-CH 2-CH 2-Cl OR CH 2=CH-CH…2 mk
• Q17State: Kohlrausch law of independent migration of ions. Faraday's first law of electrolysis.2 mk
• Q18In the following pair of compounds, which compound undergoes S N 1 reaction faster and why? OR Write the major product…2 mk
• Q18In a reaction, if the concentration of reactant ' X ' is tripled, the rate of reaction becomes twenty-seven times. What…2 mkasked 3×
• Q18A first order reaction has a rate constant 1.25 × 10^-3 s^-1. How long will 5 g of this reactant take to reduce to 2.5…2 mkasked 3×
• Q1818 g of a non-volatile solute is dissolved in 200 g of H 2 O freezes at 272.07 K. Calculate the molecular mass of…2 mk
• Q18A solution containing 60 g of a non-volatile solute in 250 g of water freezes at 270.67 K. Calculate the molar mass of…2 mk
• Q18Complete and balance the following chemical equations: KMnO 4 heat 2 MnO 4^-+5 C 2 O 4^2-+16 H^+ →2 mk
• Q18What happens when D-glucose is treated with the following reagents? Br 2 water HCN2 mk
• Q18Calculate the molar mass of a compound when 6.3 g of it is dissolved in 27 g of chloroform to form a solution that has…2 mk
• Q18Define molecularity of the reaction. State any one condition in which a bimolecular reaction may be kinetically of…2 mk
• Q18Resistance of a conductivity cell filled with 0.2 mol L^-1 KCl solution is 200 Ω. If the resistance of the same cell…2 mkasked 3×
• Q18Define the following terms: 1 × 2 Limiting molar conductivity (Λ^° m) Fuel cell2 mk
• Q18Classify the following sugars into monosaccharides and disaccharides: Galactose, Glucose, Lactose and Maltose2 mk
• Q19Which compound in the given pair would undergo S N 2 reaction at a faster rate and why? CH 3-CH 2-I and CH 3-CH 2-Br…2 mk
• Q19Carry out the following conversions: (i) Nitrobenzene to Aniline (ii) Aniline to Phenol OR (i) Write a chemical test to…2 mkasked 3×
• Q19Complete the following ionic equations: 2 MnO 4^-+5 SO 3^2-+6 H^+ → Cr 2 O 7^2-+14 H^++6 Fe^2+ →2 mk
• Q19Which of the following compounds will react more rapidly by S N 1 reaction and why? or CH 3 CH 2 Br Arrange the…2 mk
• Q19What is lanthanoid contraction? Actinoid contraction is greater from element to element than lanthanoid contraction.…2 mkasked 3×
• Q19What happens when D-glucose is treated with the following reagents? HI Conc. HNO 32 mk
• Q19Define the following terms: Peptide linkage Essential amino acids2 mk
• Q19Which of the following compounds will react more rapidly by S N 2 reaction \& why? or Arrange the following compounds…2 mk
• Q19Write the chemical equations when: Pentan-3-one is treated with H 2 N-NH 2 followed by heating with KOH in high boiling…2 mk
• Q19Classify the following sugars into monosaccharides and disaccharides: Sucrose, Lactose, Glucose, Fructose2 mk
• Q19For a chemical reaction R → P, the variation in the concentration [R] vs time t plot is given as: Predict the order of…2 mk
• Q20Which halogen compound in the following pair will react faster in S N 1 reaction and why? or Why is the dipole moment…2 mk
• Q20Write the stepwise mechanism of nucleophilic addition reactions in the carbonyl compounds. OR How will you convert the…2 mkasked 3×
• Q20Draw the structures of major monohalo products in each of the following reactions: (i) (ii) OR Give reasons for the…2 mk
• Q20Which halogen compound in the following pair will react faster in S N 2 reactions and why? CH 3-CH 2-I OR CH 3-CH 2-Br…2 mk
• Q20Write the chemical equations when: Ethanal is treated with 2,4-dinitrophenylhydrazine? Propanone is treated with Zn(Hg)…2 mk
• Q20In the following pair of compounds, which compound undergoes S N 2 reaction faster and why? Write the major product in…2 mk
• Q20Show that in case of a first order reaction, the time taken for completion of 99% reaction is twice the time required…2 mkasked 2×
• Q20Complete and balance the following chemical equations: 3 MnO 4^2-+4 H^+ → Cr 2 O 7^2-+14 H^++6 Fe^2+ →2 mk
• Q21A first order reaction takes 40 min for 75 % decomposition. Calculate rate constant. [Given: log 2=0.30, log 4=0.60 ]2 mk
• Q21Give reaction of glucose with the following: HCN Conc. HNO 32 mk
• Q21Which halogen compound in the following pair will react faster in S N 2 reaction and why? OR Why does the presence of…2 mk
• Q21What happens when Glucose reacts with Nitric acid? Write chemical equation. Write one structural difference between DNA…2 mk
• Q21A 3%solution of glucose (molar mass =180 g mol^-1 ) is isotonic with 2.5% solution of an unknown organic substance.…2 mk
• Q21A 4% solution of urea (molar mass =60 g mol^-1 ) is isotonic with 5.2% solution of an unknown organic substance.…2 mk
• Q21Define the following terms: Denaturation of protein Invert sugar2 mk
• Q21What happens when glucose reacts with bromine water? Write chemical equation. Two bases are mentioned below, identify…2 mk
• Q21Classify the following sugars into monosaccharides and disaccharides: Fructose, Lactose, Glucose, Maltose2 mk
• Q21Write two differences between order of reaction and molecularity of reaction.2 mk
• Q21Write the chemical equation when: Butan-2-one is treated with Zn(Hg) and conc. HCl. Two molecules of benzaldehyde are…2 mk
• Q21What happens when Glucose reacts with HI? Write chemical equation. Which type of bond holds a DNA double helix…2 mk
• Q22Draw the geometrical isomers of the given complex: [Pt(en) 2 Cl 2]^2+ Write the electronic configuration for d^4 ion if…3 mk
• Q22A solution is prepared by dissolving 5 g of a non-volatile solute in 200 g of water. It has a vapour pressure of 31.84…3 mkasked 3×
• Q22When a certain conductivity cell was filled with 0.05 M KCl solution, it has a resistance of 100 ohm at 25°C. When the…3 mkasked 3×
• Q22Draw the geometrical isomers of the given complex: [Co(en) 2 Cl 2]^+ Write the electronic configuration of d^4 ion if Δ…3 mk
• Q22Draw the geometrical isomers of the given complex: [Pt(NH 3) 2 Cl 2]^2+ Write the electronic configuration of d^5 ion…3 mk
• Q23The following initial rate data were obtained for the reaction: 2 NO( g)+Br 2( g) → 2 NOBr( g) What is the order with…3 mkasked 3×
• Q23Calculate emf of the following cell at 25 °C: Sn / Sn^2+(0.001 M) H^+(0.01 M) H 2( g)(1 bar) Pt (s) Given: E^°(Sn^2+ /…3 mkasked 3×
• Q23Give the structure of the major product expected from the following reactions: 1 × 3 Reaction of Ethanal with…3 mkasked 2×
• Q23The conductivity of 0 · 2 M solution of KCl is 2 · 48 × 10^-2 S cm^-1. Calculate its molar conductivity and degree of…3 mkasked 3×
• Q23Calculate emf of the following cell: Zn(s) Zn^2+(0 · 1 M) Sn^2+(0 · 001 M) Sn(s) Given: E Zn^2+ / Zn^0=-0 · 76 V, E…3 mkasked 3×
• Q23Write the reaction involved in the following: Wolff-Kishner reduction Decarboxylation reaction Cannizzaro reaction3 mkasked 3×
• Q24The vapour pressure of a solvent at 283 K is 100 mm Hg. Calculate the vapour pressure of a dilute solution containing 1…3 mkasked 3×
• Q24Give the equations of reactions for the preparation of: (any three) Phenol from chlorobenzene Salicylaldehyde from…3 mkasked 3×
• Q24Draw the structures of major product(s) in each of the following reactions: 1 × 33 mkasked 2×
• Q24Write the IUPAC names of the following coordination compounds (any three): [Co(NH 3) 4 Cl(NO 2)] Cl [Ni(NH 3) 6] C l 2…3 mkasked 2×
• Q24Write the formula for the following coordination compound: Potassium tetrahydroxidozincate (II) Arrange the following…3 mkasked 3×
• Q24A first-order reaction is 25% complete in 40 minutes. Calculate the value of rate constant. In what time will the…3 mkasked 3×
• Q25Give chemical tests to distinguish between the following pairs of compounds: (i) Phenol and Benzoic acid (ii) Propanal…3 mkasked 3×
• Q25Calculate the emf of the following cell: 3 Ni(s)+2 Ag^+(0.01 M) → Ni^2+(0.1 M)+2 Ag(s) Given that E cell^°=1.05 V, log…3 mkasked 3×
• Q25Which of the following is an allylic halide? (i) CH 3-CH=CH-Br (ii) Out of chlorobenzene and…3 mkasked 3×
• Q25Write the structures of A, B and C in the following reactions: CH 3-CH 2-Br KCN A [ Partial hydrolysis ]OH^- B NaOH+Br…3 mkasked 3×
• Q25Write IUPAC names of the following coordination compounds: (any three) K 3[Fe(CN) 6] [Pt(en) 2 Cl 2]^2+ [Co(NH 3) 4…3 mk
• Q25Give reasons for the following: Chlorine is ortho/para directing in electrophilic aromatic substitution reactions,…3 mkasked 3×
• Q25What type of nucleophilic substitution (S N 1. or.S N 2) occurs in the hydrolysis of 2-Bromobutane to form…3 mkasked 3×
• Q26Explain the following terms: Essential amino acids Peptide bond Denaturation 1 × 33 mk
• Q26Draw the structures of major product(s) in each of the following reactions: 1 × 33 mk
• Q26Write the equations of the reactions involved in the following: (i) Reimer-Tiemann reaction (ii) Kolbe's reaction Name…3 mkasked 3×
• Q26Write the mechanism of the following reaction: CH 3 CH 2 OH [443 K]H^+ CH 2=CH 2 Write the main product in each of the…3 mkasked 3×
• Q26Define the following terms: Non essential amino acids. Monosaccharides Anomers 1 × 33 mk
• Q26Define the following terms: Glycosidic linkage Primary structure of protein Disaccharides 1 × 33 mk
• Q26Account for the following: 1 × 3 Haloalkanes react with AgCN to form isocyanide as main product. Allyl chloride shows…3 mkasked 2×
• Q27Write the IUPAC name of the given compound: Why are haloalkanes more reactive towards nucleophilic substitution…3 mk
• Q27Give the structure of the major product expected from the following reactions: 1 × 3 Reaction of propanal with methyl…3 mk
• Q27Answer the following: (any three) What is peptide linkage? What type of bonds hold a DNA double helix together? Which…3 mkasked 3×
• Q27Write the IUPAC name of the given compound: CH 2=CH-CH 2-CH 2-Cl Why is thionyl chloride preferred for preparing alkyl…3 mk
• Q27Write the IUPAC name of the given compound: The presence of -NO 2 group at ortho or para position increases the…3 mk
• Q27How will you bring about the following conversions? (any three) Benzoic acid to Benzaldehyde Ethanal to Propanone…3 mkasked 3×
• Q27The rate constant of a reaction quadruples when the temperature changes from 300 K to 320 K. Calculate the activation…3 mkasked 2×
• Q28Show that the time required for 99.9 % completion in a first order reaction is 10 times of half-life (t 1 / 2) of the…3 mkasked 3×
• Q28Account for the following: 1 × 3 Haloalkanes react with NaCN to form both cyanides and isocyanides. Haloarenes do not…3 mk
• Q28Write chemical equations for the following reactions: (Do any three) Hydroboration - oxidation reaction Williamson…3 mkasked 3×
• Q28A compound 'X' with molecular formula C 3 H 9 N reacts with C 6 H 5 SO 2 C l to give a solid, insoluble in alkali.…3 mkasked 3×
• Q28The rate of a gaseous reaction triples when temperature is increased from 17^° C to 27^° C. Calculate the energy of…3 mkasked 3×
• Q28The rate constant of a reaction quadruples when the temperature changes from 700 K to 720 K. Calculate the activation…3 mk
• Q28Give the structures of A, B and C in the following reactions: CH 3 CH 2 Cl KCN A LiAlH 4 B [0^° C]HNO 2 C3 mkasked 3×
• Q28Compound (C 6 H 12 O 2) on reduction with LiAlH 4 gives two compounds and. The compound on oxidation with PCC gives…3 mkasked 3×
• Q29Batteries and fuel cells are very useful forms of galvanic cell. Any battery or cell that we use as a source of…4 mkasked 3×
• Q29The nature of bonding, structure of the coordination compound can be explained to some extent by valence bond theory.…4 mkasked 3×
• Q29The oxidation number of the central atom in a complex is defined as the charge it would carry if all the ligands are…4 mk
• Q29The oxidation number of the central atom in a complex is defined as the charge it would carry if all the ligands are…4 mkasked 2×
• Q29Carbohydrates are essential for life in both plants and animals. Carbohydrates are used as storage molecules as starch…4 mkasked 3×
• Q29The involvement of (n-1) d electrons in the behaviour of transition elements impart certain distinct characteristics to…4 mkasked 3×
• Q30The Valence Bond Theory (VBT) explains the formation, magnetic behaviour and geometrical shapes of coordination…4 mkasked 3×
• Q30In a galvanic cell, chemical energy of a redox reaction is converted into electrical energy, whereas in an electrolytic…4 mkasked 3×
• Q30Certain organic compounds are required in small amounts in our diet but their deficiency causes specific disease. These…4 mkasked 3×
• Q30Transition metals have incomplete d-subshell either in neutral atom or in their ions. The presence of partly filled…4 mkasked 3×
• Q30Proteins are the most abundant biomolecules of the living system. Proteins are the polymers of about twenty different α…4 mkasked 3×
• Q31(i) Calculate emf of the following cell at 25°C: Zn( s) Zn^2+(0 · 001 M) Cd^2+(0 · 1 M) Cd( s) Given: E Zn^2+ /…5 mkasked 3×
• Q31An organic compound with the molecular formula C 9 H 10 O forms 2, 4-DNP derivative, reduces Fehling solution and…5 mkasked 3×
• Q31Answer any five of the following: How is the crystal field splitting energy for octahedral complex (Δ 0) related to…5 mkasked 3×
• Q31(i) At the same temperature, CO 2 gas is more soluble in water than O 2 gas. Which one of them will have higher value…5 mkasked 3×
• Q31(i) Define reverse osmosis. (ii) Why are aquatic species more comfortable in cold water in comparison to warm water?…5 mkasked 3×
• Q31Attempt any five of the following: Why Zinc is not regarded as a transition element? What is Lanthanoid contraction?…5 mkasked 3×
• Q31Attempt any five of the following: 1 × 5 Ce(III) is easily oxidised to Ce(IV). Comment. E^°(Mn^2+ / Mn) is -1.18 V. Why…5 mkasked 3×
• Q32(i) Write the major product(s) in the following reactions: (2) (3) (ii) Give simple chemical tests to distinguish…5 mkasked 3×
• Q32Answer any five questions of the following: N,N-diethyl-benzenesulphonamide is insoluble in alkali. Give reason.…5 mkasked 3×
• Q32(i) Account for the following: (1) Oxidation of aldehydes is easier as compared to ketones. (2) The alpha ( α )…5 mkasked 3×
• Q32(i) Ishan's automobile radiator is filled with 1.0 kg of water. How many grams of ethylene glycol (Molar mass =62 g…5 mkasked 3×
• Q33(i) Account for the following: (1) The melting and boiling points of Zn, Cd and Hg are low. (2) Of the d^4 species,…5 mkasked 3×
• Q33Attempt any five of the following: Write the IUPAC name of the complex: [Co(H 2 O)(CN)(en) 2]^2+ Why is geometrical…5 mkasked 3×
• Q33An amide 'A' with molecular formula C 7 H 7 ON undergoes Hoffmann Bromamide degradation reaction to give amine 'B'. B'…5 mkasked 3×
• Q33(i) The resistance of 0.05 M CH 3 COOH solution is found to be 100 ohm. If the cell constant is 0.0354 cm^-1, calculate…5 mkasked 3×