Question

S-ZnS-H2S-SO2-Na2SO3

Answer 1

$1) \: Zn + S = ZnS$

$2) \: ZnS + 2HCl = H_{2}S + ZnCl_{2}$

$3) \: 2H_{2}S + 3O_{2} = 2H_{2}O + 2SO_{2}$

$4) \: 2NaOH + SO_{2} = Na_{2}SO_{3} + H_{2}O$