Question

Which reactants form the salt CaSO4(s) in a neutralization reaction?
(1) H2S(g) and Ca(ClO4)2(s)
(2) H2SO3(aq) and Ca(NO3)2(aq)
(3) H2SO4(aq) and Ca(OH)2(aq)
(4) SO2(g) and CaO(s)

Answer 1

3 Neutralization reaction would be an acid and a base as reactants

Answer 2

The answer is (3) H2SO4(aq) and Ca(OH)2(aq). The neutralization reaction will not change the valence of elements. For (4), SO2 reacts with CaO is called synthesis reaction.