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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Z n / H_{2} O

Which of the following cannot be used for the preparation of $H_{2}$

Complete and balance the following reactions.

(a) $N a + H_{2} O \to$ _________ + _________

(b) $C a + H_{2} O \to$ __________+_________

(d) $Z n + H_{2} O \to$ ___________+_________

(e) $F e + H_{2} O \to$ ____________+_________

(f) $Z n + H C l \to$ _____________+__________

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