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Q.

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

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a

Sodium

b

Calcium

c

Magnesium

d

Iron

answer is D.

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Detailed Solution

The metals sodium, calcium, and magnesium form their hydroxides due to their strong water reactivity.
Iron interacts with steam to create metal oxides and hydrogen gas despite being a less reactive metal than other metals.
Both cold and hot water have no effect on it.
$3 F e (s) + 4 H_{2} O (g) \to F e_{3} O_{4} (s) + 4 H_{2} (g)$

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