Question

CaS->Ca(No3)3->Ca(No2)3->CaSO4

Answer 1

$1) CaS+4 HNO_{3} =Ca (NO_{3} ) _{3} +S+2NO _{2} +2 H_{2} O \ 2) Ca(NO _{3} ) _{2} =Ca(NO _{2} ) _{2} +O _{2} \ 3) Ca(NO _{2} ) _{2}+H _{2} SO _{4} =CaSO _{4} +NO _{2} +NO+H _{2} O$