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Question

How much amount of zinc is required to react with dilute H2SO4 for obtaining 224 mL hydrogen at STP?

A
0.65 g
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B
6.5 g
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C
65 g
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D
0.065 g
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Solution

The correct option is A 0.65 g
Zn+H2SO4ZnSO4+H2
At STP 224 mL of hydrogen corresponds to 2241000×22.4=0.01 moles of hydrogen. They will be produced from the reaction of 0.01 mole of Zn with 0.01 mole of sulphuric acid. Hence, the mass of zinc required is 65.38×0.01=0.65 g.

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