When sodium hydroxide reacts with ZnSO4 it forms X, this X is soluble in NaOH excess, due to formation of :
Zn(OH)2
ZnO
Na2ZnO2
All of these
As we learnt ,
Reaction of NaOH with salts -
Forming insoluble hydroxides which dissolves in excess of NaOH. Eg. Zn, Al, Sb, Pb, Sn, As
- wherein
Sodium zincate is soluble in NaOH .
Therefore, option(3) is correct.