Question

Ag+H2SO4=
Ba+HCI=
Fe+S=
Hg+H2O=

Answer 1

$2Ag+ H_{2}S O_{4}=Ag_{2}SO_{4}+H_{2}$
$Ba+2HCl=BaCl_{2}+H_{2}$
$Fe+S=FeS$
$Hg+H_{2}O=HgO+H_{2}$