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Q.

Zn gives hydrogen with sulphuric acid and hydrochloric acid but not with nitric acid because?


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a

Zn acts as an oxidizing agent when it reacts with nitric acid.

b

Nitric acid is a weaker acid than sulphuric acid and hydrochloric acid.

c

Zn is above hydrogen in the electrochemical series.

d

Question Image is reduced in preference toQuestion Image ion. 

answer is D.

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Detailed Solution

detailed_solution_thumbnail
Concept- More reactive metal displaces less reactive metal in a displacement reaction. Since copper is less reactive than hydrogen and cannot displace hydrogen in diluted hydrochloric acid, zinc displaces hydrogen in this solution because it is more reactive than hydrogen.
Distilled water is acidified to boost its electrical conductivity because pure and distilled water doesn't generate Question Image ions and is a poor conductor of electricity.
Zinc is above hydrogen in the electrochemical series. It reacts with acids to give salts and hydrogen gas. So, when it reacts with sulphuric acid and hydrochloric acid, it gives hydrogen gas.
According to our knowledge, we know that hydrochloric acid is a strong oxidizing agent. So, when it reacts with zinc metal, hydrogen is not given out because hydrogen is oxidized to form water by nitric acid.
Hence, the correct answer is option 4.
 
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