Question

NaOH + H2SO4 --- Na2SO4 + H2O
ZnO + HNO3 --- Zn(NO3)2 + H2O
CuCl2 + Na2S ---- NaCl + CuS
H2O2 --- H2O + O2
HgO ---- Hg + O2

Answer 1

(1) 2NaOH + H2SO4 → Na2SO4 + 2H2O.

(2) ZnO + 2HNO3 → Zn(NO3)2 + H2O.

(3) CuCl2 + Na2S → CuS + 2NaCl.

(4) 2H2O2 → 2H2O + O2.

(5) 2HgO → 2Hg + O2.