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12 g of Mg (atomic mass 24) will react completely with hydrochloric acid to give

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12 g of Mg (atomic mass 24) will react completely with hydrochloric acid to give

(a) One mol of H2

(b) 1/2 mol of H2

(c) 2/3 mol of O2

(d) both 1/2 mol of H2 and 1/2 mol of O2

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Correct answer: (b) 1/2 mol of H2

Explanation:

Mg + 2HCl → MgCl2 + H2

1 mole                     1 mole

\(\frac{1}{2}\)mole    \(\frac{1}{2}\)mole (12g of Mg = \(\frac{1}{2}\) mol)

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