Na2S + NaNO3 -> No reaction Na2S + KClO3 -> No reaction (K2S is soluble in water) Na2S + Pb(NO3)2 = 2NaNO3 + PbS Na2SO4 + Pb(NO3)2 = PbSO4 + 2NaNO3 KClO3+KIO3 -->NO REACTION Solution Na2S + NaNO3 -> No reaction Na2S + KClO3 -> No reaction (K2S is soluble in water) Na2S + Pb(NO3)2 = 2NaNO3 + PbS Na2SO4 + Pb(NO3)2 = PbSO4 + 2NaNO3 KClO3+KIO3 -->NO REACTION.