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Stoichiometric Calculations

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Question

When same amount of zinc is heated separately with $H_{2} S O_{4}$ and $N a O H$ , the ratio of volumes of hydrogen evolved is:

A

1 : 1

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B

1 : 2

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C

2 : 1

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D

9 : 4

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Solution

The correct option is A 1 : 1
1.Reaction of zinc and $H_{2} S O_{4}$ (excess)
$Z n + H_{2} S O_{4} ⟶ Z n S O_{4} + H_{2}$
(ii) Reaction of zinc and $N a O H$ (excess)
$Z n + 2 N a O H ⟶ N a_{2}$ $Z n O_{2}$ + $H_{2}$
Ratio of volumes of hydrogen evolved = $\frac{1}{1}$ = 1 : 1

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