Question

Assertion (A) : Hydrogen gas is not evolved when a metal reacts with nitric acid.

Reason (R) : Nitric acid is a strong oxidising agent.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

Answer 1

Answer:

Both are right ... Both A and R are true and R is the correct explanation of A.

Explanation:

Hydrogen gas is not envolved when a metal recates with nitric acid. It is because HNO3 is strong oxidising agent.

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Answer 2

(a) Both A and R are true and R is the correct explanation of A.

• Generally, metals react with acids to form salt and water.
• When a metal reacts react with dilute nitric acid, hydrogen gas is evolved but with concentrated nitric acid hydrogen gas is not evolved.
• It is because HNO3 is a strong oxidising agent. It oxidises the hydrogen produced to water and itself gets reduced to nitrogen oxides like N2O, NO and NO2.
• Hence, Both A and R are true and R is the correct explanation of A.