What is formed when magnesium reacts with cold water?

MgO + H2

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Mg(OH)2 + H2

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Mg(OH)2 + H2

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Magnesium does not react with cold water.

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Solution

The correct option is D i.e Magnesium does not react with cold water.
Magnesium does not react with cold water. Magnesium doesn't really react with cold water is that it becomes coated with Magnesium hydroxide which is insoluble, so it prevents water coming into contact with Magnesium.
It reacts with hot water, so when Mg reacts with hot water, it will form magnesium hydroxide and hydrogen gas. It also starts floating due to the bubbles of hydrogen gas sticking to its surface.
Reaction:
Mg + cold $H_{2} O ⟶ N o R e a c t i o n$
Mg + hot $H_{2} O ⟶ M g (O H)_{2} + H_{2}$

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