9.

H2 + SO3 = H2SO3

H2 + S = H2S

H2 + 2Na = 2NaH

H2 + CuO =  H2O + Cu

Ответ: 1236

10.

2Na + 2H2O = 2NaOH + H2

Ca + 2HCl = CaCl2 + H2

2Na + H2 = 2NaH

Ca + Cl2 = CaCl2

Ответ: 1-В, 2-А, 3-Б, 4-Г