Which of the following gas is released when an acid reacts with metal?

Hydrogen

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Nitrogen

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Oxygen

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Carbon

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Solution

The correct option is A
Hydrogen

Metals like sodium (Na), magnesium (Mg), aluminium (Al), zinc (Zn), iron (Fe) etc., react with acids to produce metal salt and hydrogen gas.

$Z n + 2 H C l \to Z n C l_{2} + H_{2}$

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