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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 3 · Q23
Give reasons: (a) Fuel cells are preferred for production of electrical energy than thermal plants. (b) Iron does not rust even if zinc coating is…
Give reasons :
(a)
Fuel cells are preferred for production of electrical energy than thermal plants.
(b)
Iron does not rust even if zinc coating is broken in a galvanized pipe.
(c)
In the experimental determination of electrolytic conductance, Direct Current (DC) is not used.
Marking-scheme solution
(a)
Fuel cells are pollution free than thermal plants / Fuel cells have higher efficiency than
thermal plants.
(b)
Zinc is easily oxidized as compare to iron / E° value of Zn is more -ve than iron
(c)
Direct current changes the composition of the solution.
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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.