Which one of the following metals does NOT react with cold water to li

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Which one of the following metals does NOT react with cold water to liberate hydrogen gas ?

Potassium
Iron
Calcium
Sodium
This question was previously asked in
UPSC NDA-2 – 2023
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Iron (Fe) is a less reactive metal compared to Potassium (K), Sodium (Na), and Calcium (Ca). Highly reactive metals like K and Na react vigorously with cold water, producing hydrogen gas and metal hydroxides. Calcium also reacts with cold water, though less vigorously, producing hydrogen gas and calcium hydroxide. Iron, however, does not react with cold water. It reacts slowly with hot water and vigorously with steam to produce hydrogen gas and metal oxide.
The reactivity of metals determines their reaction with water. More reactive metals displace hydrogen from cold water; moderately reactive metals displace hydrogen from hot water or steam; less reactive metals do not react with water at all.
The general order of reactivity of these metals with water is K > Na > Ca > Fe. Potassium and Sodium react violently with cold water. Calcium reacts steadily with cold water. Iron reacts with steam (very hot water) to form iron oxides and hydrogen gas.

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