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Solution


Q.

Assertion: Zinc fails to evolve hydrogen gas on reacting with dilute sulphuric acid.
Reason: It gives the NO gas on reaction with ammonia.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct, but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true  

Ans.

(4)

It is because dil. HNO₃ is an oxidising agent therefore, zinc gives NO and not H₂ with dil. HNO₃. Thus, assertion is false but reason is true.