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Properties of Chlorine

Which of the ...

Question

Which of the following gas is formed when very dilute nitric acid reacts with magnesium at room temperature?

A

N₂O

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B

H₂

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C

NO₂

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D

NO

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Solution

The correct option is B
H₂

Very dilute (about 1%) nitric acid reacts with magnesium at room temperature to give magnesium nitrate and hydrogen gas. Since the oxidizing action of the acid is much reduced due to dilution. This reaction proves that nitric acid contains hydrogen.

$M g + 2 H N O_{3} V e r y d i l u t e \to M g (N O_{3})_{2} + H_{2}$

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