Science
Assertion (A) : Hydrogen gas is not evolved when zinc reacts with nitric acid.
Reason (R) : Nitric acid oxidises the hydrogen gas produced to water and itself gets reduced.
options
- (A) and (R) are true and (R) is the reason for (A).
- (A) and (R) are true and (R) is not the reason for (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.
Nitric Acid
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Answer
(A) and (R) are true and (R) is the reason for (A)
Reason —
Assertion (A) is true because normally, when zinc reacts with acids like hydrochloric acid or sulphuric acid, hydrogen gas is released but since nitric acid is a strong oxidising agent so when zinc reacts with nitric acid, instead of releasing hydrogen gas, the hydrogen formed is immediately oxidised by nitric acid to form water.
Reason (R) is true because during the reaction, nitric acid acts as an oxidising agent so it oxidises the hydrogen (which would have formed as gas) into water and nitric acid itself gets reduced to nitrogen oxides such as NO or NO2.
Hence, (A) and (R) are true and (R) is the reason for (A)
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