Question

Which of the following is a displacement reaction?



MgCO3______ MgO + CO2

2Na +2H2O____2NaOH +H2

H2 + O2 _____ 2H2O

2Pb(NO3)2_____ 2PbO + 4NO2 + O2

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Answer 1

Answer:

Displacement reaction:

2Na +2H2O _____ 2NaoH + H2.

Hope it helps you.

Answer 2

The reaction 2Na +2H₂O ⇒2NaOH +H₂ is a displacement reaction.

• In the displacement reaction, a more reactive element displaces the least reactive element in the chemical reaction.
• In the reaction

               2Na +2H₂O ⇒2NaOH +H₂

          Na is a more reactive metal so it forms a NaOH compound along

         with the evolution of H₂ gas.

• In this reaction, Na reacts with H₂O to form the compound NaOH and evolve H₂ gas.
• So, the given reaction is a displacement reaction.

Hence, the reaction Na +2H₂O ⇒2NaOH +H₂ is a displacement reaction.