Q.

Which of the following is metal displacement reaction

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a

Zn + CuSO4 → ZnSO4 + Cu

b

2Na+2H2O→2NaOH+H2

c

Ca+2H2O→Ca(OH)2+H2

d

2HgO→2Hg+O2

answer is A.

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Detailed Solution

Metal displacement reaction involves ,displacement of less electropositive metal by a more electropositive metal.Zn being more electropositive than Cu it displaces Cu from CuSO4
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