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Science · 2023 · 5 marks
CBSE 2023 · Region 4 · Set 2 · Q36
(i)It is observed that covalent compounds are bad conductors of electricity. Give reason.(ii)Carbon can neither form $\displaystyle \mathrm{C}^{4+}$ cation nor $\displaystyle \mathrm{C}^{4-}$ anion. Why?(iii)Draw electron dot structure of Ethanol.(iv)Identify hetero atom (s) in the following compounds:(a)
(b)$\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$(i)What are soaps? Explain the mechanism of cleansing action of soap with the help of a labelled diagram.(ii)Detergents are better than soaps. Justify.
(i)
It is observed that covalent compounds are bad conductors of electricity. Give reason.
(ii)
Carbon can neither form $\displaystyle \mathrm{C}^{4+}$ cation nor $\displaystyle \mathrm{C}^{4-}$ anion. Why?
(iii)
Draw electron dot structure of Ethanol.
(iv)
Identify hetero atom (s) in the following compounds:
(a)
(b)
$\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
(i)
What are soaps? Explain the mechanism of cleansing action of soap with the help of a labelled diagram.
(ii)
Detergents are better than soaps. Justify.
Marking-scheme solution
(A) (i) Covalent compounds do not have free ions / electrons
(ii) • It does not form \(\displaystyle \mathrm{C}^{4+}\) cation, as the removal of four valence electrons will require a huge amount of energy.
Carbon does not form C \(\displaystyle { }^{4-}\) anion as the nucleus with six protons will not be able to hold ten electrons due to its small size.
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.