Question

Why Mg does not react with cold water?
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Answer 1

Because it's reactivity towards cold is less than hot water

Answer 2

Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. Very clean magnesium ribbon has a very slight reaction with cold water. ... However, the reaction soon stops because the magnesium hydroxide formed is almost insoluble in water and forms a barrier on the magnesium preventing further reaction.

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