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Q.

12g   of Mg (At. mass 24) will react completely with acid to give

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a

One mole of  H2

b

1/2 mole of H2

c

2/3 mole of O2

d

Both 1/2mol  of  H2  and 1/2mol of O2

answer is B.

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Detailed Solution

Mg+2≡H2n=12gm24gm=12 mole of H2
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12g   of Mg (At. mass 24) will react completely with acid to give