Question

the metal which react will cold water to produce hydrogen is (i) magnesium (ii) aluminum (iii) calcium (iv) iron​

Answer 1

Answer:

iii) Calcium.

Explanation:

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Answer 2

Answer: Metals like potassium and sodium

Explanation:They react violently with cold water. In case of sodium and potassium, the reaction is so violent and exothermic that the evolved hydrogen immediately catches fire. The reaction of calcium with water is less violent.