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In which of the following reactions, the stoichiometric ratio of $H_{2} {SO}_{4} to H_{2}$ gas is one?

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$Zn (s) and H_{2} {SO}_{4}$

$Na (s) and$ $H_{2} {SO}_{4}$

$Al (s) and conc. H_{2} {SO}_{4}$

$Cu (s) and H_{2} {SO}_{4}$

answer is A, B.

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Detailed Solution

$Zn + H_{2} {SO}_{4} \to {ZnSO}_{4} + H_{2}; 2 Na + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + H_{2}; 2 Al + 6 H_{2} {SO}_{4} \to {Al}_{2} {({SO}_{4})}_{3} + 3 H_{2}$

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