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Which of the following reactions produces hydrogen?

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Which of the following reactions produces hydrogen?

(a) Mg + H2O

(b)  H2S4O8 + H2O

(c) BaO2 + HCI

(d) Na2O2 + 2HCl

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Correct option (a) Mg + H2O

Explanation:

Alkali and alkaline earth metals react with water to produce hydrogen gas and metal hydroxide. This is due to their high electropositive character.

2Na + 2H2O → 2NaOH + 2NaOH+ H2

Mg + 2H2O  → Mg(OH)2 + H2

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