Hydrogen cannot be obtained by:

Z n + d i l . H_{2} S O_{4}

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Z n + d i l . H N O_{3}

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M g + H_{2} O (g)

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M g + d i l . H_{2} S O_{4}

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Solution

The correct option is B $Z n + d i l . H N O_{3}$
$Z n$ reacts to form hydrogen with dilute $H N O_{3} .$ Before the hydrogen is released, it reduce $H N O_{3}$ into an oxide of nitrogen.

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Hydrogen can be obtained from water by

N O_{2}

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