Ag-->AgNO3--->X---->BaSO4

Question

Ag-->AgNO3--->X---->BaSO4

Answer 1

Ag+2HNO3(конц.)=AgNO3+NO2+H2O
AgNO3+BaCl2=AgCl+Ba(NO3)2
Ba(NO3)2+H2SO4=BaSO4+HNO3