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Question
Which of the following is an example displacement reaction?
Options:
A .  CaCO3(s) Heat−−→ CaO(s) + CO2(g)
B .  2Mg(s) + O2(g) → 2MgO(s)
C .  Fe(s) + CuSO4(aq)→ FeSO4(aq) + Cu(s)
D .  N2(g)+H2(g)→2NH3(g)
Answer: Option C
:
C
The reaction in which a more reactive element displaces a less reactive element from its compound or salt solution is called a displacement reaction.
Among the given options only in the reaction between iron and copper sulphate, iron (Fe) being more reactivedisplaces copper (Cu) from its solution.

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