Reaction:
$M g + 2 H C l \to M g C l_{2} + H_{2}$

How many moles of hydrogen gas is produced from 1 mole of $M g$ ?

0.5 mole

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1 mole

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2 mole

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3 mole

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Solution

The correct option is B 1 mole
Reaction :

$M g + 2 H C l \to M g C l_{2} + H_{2}$
1 2 1 1
one mole two mole one mole one mole

$∴$ $1$ mole of $M g$ reacts with $2$ moles of $H C l$ and forms $1$ mole of hydrogen gas.

Therefore, the option is B.

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