Which of the following is a displacement reaction?
(a) $MgCO_3 \rightarrow MgO + CO_2$
(b) $2Na + 2H_20 \rightarrow 2NaOH + H_2$
(c) $2H_2 + O_2 \rightarrow 2H_2O$
(d) $2Pb(NO_3)_2 \xrightarrow{heat} 2PbO + 4NO_2 +O_2$

Academic Chemistry NCERT Class 10

Correct answer: (b) $2Na + 2H_20 \rightarrow 2NaOH + H_2$

Explanation: Sodium displaces hydrogen to form sodium hydroxide. Hence, it is a displacement reaction.

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Updated on: 10-Oct-2022

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