✓ Board-verified
Chemistry · 2025 · 3 marks
CBSE 2025 · Region 1 · Set 1 · Q23
(a) State the following: 3 (i) Kohlrausch law of independent migration of ions and (ii) Faraday's first law of electrolysis. (b) Using E_values^° of…
(a)
State the following : $\displaystyle 3$
(i)
Kohlrausch law of independent migration of ions and
(ii)
Faraday's first law of electrolysis.
(b)
Using $\displaystyle \mathrm{E}_{\text {values }}^{\circ}$ of X and Y given below, predict which is better for coating the surface of iron to prevent corrosion and why ? Given $\displaystyle \mathrm{E}_{\mathrm{X}^{2+} / \mathrm{X}}^{\circ}=-2.36 \mathrm{~V}$, \[\begin{aligned} & \mathrm{E}_{\mathrm{Y}^{2+} / \mathrm{Y}}^{\circ}=-0.14 \mathrm{~V}, \\ & \mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\circ}=-0.44 \mathrm{~V} \end{aligned} \]
Marking-scheme solution
(a)(i)
The limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte.
(ii)
The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.
(b)
'X' is better, as X has more negative electrode potential than Fe / X has more oxidation potential than Fe.
All Electrochemistry questions2025 question paperNCERT solutions: ElectrochemistryPractice Electrochemistry →
More from Electrochemistry
- Kohlrausch gave the following relation for strong electrolytes: Λ_m=Λ_m^°-A √C Which of the following equality holds true?2025 · asked 2×
- Assertion: E_Cu^° 2+/ Cu is positive (+0.34 V). Reason (R): Copper has high Δ_a H^° and low Δ_hyd H^°.2023 · asked 2×
- During the electrolysis of aqueous NaCl, the cathodic reaction is:2024
- Calculate the standard Gibbs energy (Δ_r G^°) of the following reaction at 25 °C: 3 + 2 Au( s)+Ca^2+(1 M) → Au^3+(1 M)+Ca( s); E_Au^3+ / Au^°=+1.5 V,…2025
- (i) What should be the signs (positive/negative) for E^°_Cell and Δ G^° for a spontaneous redox reaction occurring under standard conditions? (ii)…2023
- Batteries and fuel cells are very useful forms of galvanic cell. Any battery or cell that we use as a source of electrical energy is basically a…2024
- (i) Why on dilution the Λ_m of CH_3 COOH increases very fast, while that of CH_3 COONa increases gradually? (ii) What happens if external potential…2022
- During electrolysis of dilute H_2 SO_4, using platinum electrodes, the gas evolved at the anode is:2025
CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.