Which one of the following metals do not react with cold as well as hot water?

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Solution

The correct option is D Fe
The metal sodium, calcium and magnesium are highly reactive to water and make their hydroxides.
Iron is a less reactive metal and does not show any reaction while treated with cold as well as hot water but will react with steam and form metal oxides and hydrogen gas.

$3 F e (s) + 4 H_{2} O (g) \to F e_{3} O_{4} (s) + 4 H_{2} (g)$
Iron Steam Iron(III) oxide Hydrogen

Hence option (D) is correct.

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