Which of the following reaction produces hydrogen?

M g + H_{2} O

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H_{2} S_{2} O_{8} + H_{2} O

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B a O_{2} + H C l

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N a_{2} O_{2} + 2 H C l

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Solution

The correct option is A $M g + H_{2} O$
Mg reacts with hot water to produce $H_{2}$ because it is more electropositive than hydrogen.

$M g + H_{2} O \to M g O + H_{2}$

All other reactions are used for the manufacture of $H_{2} O_{2}$

$H_{2} S_{2} O_{8} + 2 H_{2} O \to 2 H_{2} S O_{4} + H_{2} O_{2}$

$B a O_{2} + 2 H C l \to B a C l_{2} + H_{2} O_{2}$

$N a_{2} O_{2} + 2 H C l \to 2 N a C l + H_{2} O_{2}$

Hence, the correct answer is $A$

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Similar questions

H_{2} O_{2} ?

$M g O + H C l \to$ __________.

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H_{2} O_{2}

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