(1) 2AgNO3(aq)+Cu(s)→2Ag(s)+Cu(NO3)2(s) In the above reaction, Cu being more reactive displaces the less reactive metal i.e., Ag. Therefore, this reaction is an example of metal displacement reaction. (2)3AgNO3(aq)+K3PO4(aq)→Ag3PO4(s)+3KNO3(aq) This is an example of double displacement reaction. (3) 4KClO3(s)
Δ
–––––––🢖
KCl(s)+3KClO4(s)
In the above reaction, O atom of KClO3 undergoes oxidationand Cl undergoes reduction. Therefore, this reaction is anexample of disproportionation reaction. (4) 4Fe(s)+3O2(g)→2Fe2O3 The above reaction is an example of combination reaction as iron atom combines with oxygen atom to form ferric oxide. The correct option is (3) .