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Question

The amount of zinc required to produce $$224$$ ml of $$H_2$$ at NTP on treatment with dilute $$H_2SO_4$$ solution will be:


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

The correct option is B $$0.65$$g
Let us consider the problem.

zinc reacts with sulfuric acid according to the following formula.

$$Zn + {H_2}S{O_4} \to ZnS{O_4} + {H_2}$$

Therefore, $$1$$ mole of zinc reacts to give $$1$$ mole of hydrogen

Volume of $$1$$ mole of hydrogen at $$STP$$ is $$22400$$ $$ml$$

$$1$$ mole of $$Zn$$ is $$65$$ grams

Therefore $$0.65$$ grams of zinc reacts to give $$224$$ $$ml$$ of hydrogen.

Hence, the correct option is $$A$$

Chemistry

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