Question

The mixing of which pair of reactants will result in a precipitation reaction?
NH4Cl(aq) + NH4I(aq)
KClO4(aq) + (NH4)2S(aq)
Na2SO4(aq) + Cu(NO3)2(aq)
Ba(NO3)2(aq) + K2CO3(aq)

Answer 1

Answer:

The last option will form the precipitate reaction of insoluble compound