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Science · 2024 · 3 marks
CBSE 2024 · Region 5 · Set 3 · Q27
Answer the following questions in the context of electrolysis of water: (a) Why is this reaction/process called a decomposition reaction? (b) Giving…
Answer the following questions in the context of electrolysis of water :
(a)
Why is this reaction/process called a decomposition reaction ?
(b)
Giving reason state whether this reaction is exothermic or endothermic.
(c)
Name the gases collected at the anode and cathode.
(d)
What is the mass ratio of the gases collected at the anode and cathode ?
Marking-scheme solution
(a) Because water breaks up into hydrogen gas and oxygen gas.
(b) Endothermic reaction as Electrical energy is required to decompose water.
(c)
Anode - oxygen; Cathode - hydrogen
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.