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Question

12 g of Mg will react completely with a monoprotic acid to give:

A
1 mole of O2
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B
1 mole of acid
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C
5 moles of H2
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D
1/2 mole of H2
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Solution

The correct option is D 1/2 mole of H2
Mg on reaction with an acid always liberates H2 gas.
So, let us take the reaction:
Mg+2HClMgCl2+H2
1 mol of Mg reacts to give 1 mol of H2
No. of moles of Mg=given massmolar mass=1224=0.5 mol
So, 0.5 mol of Mg on reaction with an acid will give 0.5 mol of hydrogen gas.

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