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(a) Pb(NO3 )2 (aq) + 2KI (aq) ⇨ PbI2 (s) + 2KNO3 (a)
(b)Cu (s) + 2AgNO3 (aq) ⇨ Cu(NO3 )2 + Ag (s)
(c)Zn (s) + H2SO4 (aq) ⇨ ZnSO4 (aq) + H2 (g)
(d)CaCO3 + Heat ⇨ CaO (s) + CO2 (g)
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