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Science · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 3 · Q28
State reasons for the following: (a) Zinc oxide is an amphoteric oxide. (b) Calcium starts floating when immersed in water. (c) In the reactions of…
State reasons for the following :
(a)
Zinc oxide is an amphoteric oxide.
(b)
Calcium starts floating when immersed in water.
(c)
In the reactions of nitric acid with metals, generally hydrogen gas is not evolved.
Marking-scheme solution
(a) Amphoteric oxide (zinc oxide) reacts with acids as well as bases to produce salt and water.
(b) Bubbles of hydrogen gas which are formed during the reaction stick to the surface of calcium metal and make it lighter.
(c) Nitric acid is a strong oxidising agent. It oxidises the hydrogen produced in the reaction to water.
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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.