Which among the following statements is incorrect for magnesium metal?

(a) It burns in oxygen with a dazzling white flame.
(b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
(c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.
(d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

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Solution

Option (b) is correct.

Magnesium does not react with cold water. It reacts with hot water to form magnesium hydroxide and hydrogen. The reaction involved is:

$Mg(s) + 2 H_{2} O(l) \to {Mg(OH)}_{2} (aq) + H_{2} (g)$

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Statement 1: Magnesium burns in air with a dazzling white flame.
Statement 2: Metal + Water $\to$ Metal oxide + Hydrogen

Translate the following statements into chemical equations and then balance them.

(a) Hydrogen gas combines with nitrogen to form ammonia.

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(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

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