Question

which of the following is a divalent radical.
a) Hydroxide
b) Nitrate
c) Sulphate
d) Phosphate​

Answer 1

sulphate is the answer it's the divalent radical

Answer 2

Answer:

Solution. Divalent radical is the radical which has valency of 2. The charge present on radical shows its valency. Among hydroxide (OH^-), Nitrate (NO_3^-) , Sulphate (SO_4^{2-}) and phosphate (PO_4^{3-}) divalent radical is Sulphate (SO_4^{2-}).

hope it's helpfull