Which of the following acids is not used in the preparation of hydrogen from metals?

Nitric acid

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Hydrochloric acid

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Sulphuric acid

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None of these

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Solution

The correct option is B i.e Nitric acid
Nitric acid, even in its dilute form is not used in the preparation of hydrogen from metals because nitric acid is a powerful oxidising agent. The oxygen formed due to its decomposition, oxidises the hydrogen to give water. Thus, defeating the purpose of reaction.
Example: $3 Z n + 8 H N O_{3} ⟶ 3 Z n (N O_{3})_{2} + 4 H_{2} O + 2 N O$

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Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Q. Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen. Explain why?

Q. Give a reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.

Complete the following sentence, choosing the correct word from the brackets.
"Concentrated sulphuric acid is used in the laboratory preparation of nitric acid and hydrochloric acid because it is ................ (less volatile/stronger) in comparison to these two acids."

Q. Which of the following is not a mineral acid?

(a) Hydrochloric acid
(b) Citric acid
(c) Sulphuric acid
(d) Nitric acid

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