Complete the missing components/ variables given as x and y in the following reactions
(a) Pb(NO3)2(aq) + 2KI(aq) -> PbI2(x) + 2KNO3(y)
Ans. x →s, y →aq
(b) Cu(s) + AgNO(aq) → Cu(NO3) 2 (aq) + x
Ans. x → Ag
(c) Zn (s) + H2SO4 (aq) + ZnSO4 ( x) + H2 (y )
Ans. x →aq, y →g
(d) CaCO3 x → CaO (s) + CO2 (g)
Ans. x → heat
