3. Complete the missing components/variables given as x and y in the folowing reactions (a) Pb(NO,), (aq) + 2KI(aq)→ Pbl, () + 2KNO,() (b) Cu(s) + 2Ag NO,(aq)→CuNO), faq) + x(s) (c) Zn(s) + H,So,(aq) Znso,) + H,() (d) CaCO,(s) X CaO(s) + CO,G)
Part (a) is already complete.
For part (b), x = 2Ag.
Part (c), y = H2.
Part (d), X = heat