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Chemistry · 2023 · 2 marks
CBSE 2023 · Region 2 · Set 1 · Q20
(a) Give reasons: 2 × 1 (i) Mercury cell delivers a constant potential during its life time. (ii) In the experimental determination of electrolytic…
(a)
Give reasons : $\displaystyle \mathbf{2} \boldsymbol{\times} \mathbf{1}$
(i)
Mercury cell delivers a constant potential during its life time.
(ii)
In the experimental determination of electrolytic conductance, Direct Current (DC) is not used.
OR
(b)
Define fuel cell with an example. What advantages do the fuel cells have over primary and secondary batteries?
Marking-scheme solution
(i) Because the overall reaction does not involve any ion in the solution whose concentration can change.
(ii) Because DC changes the composition of the electrolytic solution.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.