Which one of the following metals produces hydrogen with cold water?

[amp_mcq option1=”Silver” option2=”Sodium” option3=”Copper” option4=”Iron” correct=”option2″]

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UPSC CAPF – 2021

Sodium is a highly reactive alkali metal. It reacts vigorously with cold water, producing hydrogen gas and sodium hydroxide.

The reactivity of metals with water varies. Very reactive metals (like Group 1 alkali metals) react with cold water. Less reactive metals (like zinc or iron) may react with steam but not cold water. Even less reactive metals (like copper, silver, gold) do not react with water at all.

The reaction of sodium with cold water is exothermic and can even ignite the hydrogen produced due to the heat generated. The general reaction is 2M + 2H₂O → 2MOH + H₂ (where M is an alkali metal). Other metals like Potassium and Calcium also react with cold water, while Iron reacts with steam to produce iron oxides and hydrogen.

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