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Q.

A metal which reacts with a very dilute HNO3 to give hydrogen gas is

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a

Al

b

Fe

c

Mg

d

Si 

answer is A.

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Detailed Solution

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Metals generally react with dilute acids to form salt and yield H2 gas. Na, K, and Al react with water to give hydrogen gas whereas, Fe needs steam to yield hydrogen gas. Mg and Mn react with diluted HNO3 to give H2 gas. 

The reaction involved is: 
Mg + 2HNO3  → Mg(NO3)2 + H2 

Hence, a metal that reacts with a very dilute HNO3 to give hydrogen gas is Mg.

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