When hydrochloric acid is added to magnesium, which gas is liberated?

Chlorine

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Hydrogen

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Oxygen

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Nitrogen

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Solution

The correct option is B
Hydrogen

When hydrochloric acid is added to magnesium, magnesium chloride is formed with the evolution of hydrogen gas.

This reaction is an example of displacement reation. In displacement reaction more reactive element displaces the less reactive element from their compounds.

The balanced chemical reaction for the following is :

$M g + 2 H C l \to M g C l_{2} + H_{2} + H e a t$

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N T P

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

(H_{2} O)

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