Which of the following pair of substances can react to produce $H_{2}$ gas?

Hydrolith and water

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Sodium and heavy water

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Hg and Boiling water

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Iron and conc. sulphuric acid

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Solution

The correct option is A Hydrolith and water
$C a H_{2} + 2 H_{2} O \to C a (O H)_{2} + 2 H_{2}$

$2 N a + 2 D_{2} O \to 2 N a O D + D_{2}$

$H g + H_{2} O \to N o r e a c t i o n$

$3 F e + 8 H_{2} S O_{4} \to F e S O_{4} + F e_{2} (S O_{4})_{3} + 4 S O_{2} + 8 H_{2} O$

Hence, option A is correct.

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