Magnesium reacts with [[1]] water and not with [[2]] water.

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answer is HOT, COLD.

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Detailed Solution

Since, magnesium is less reactive than sodium, potassium and calcium, it reacts with hot water and not with cold water. Magnesium reacts with hot water to form magnesium hydroxide and water:

Mg+2H2O hot→Mg(OH)2 + H2

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