Question

Which of the following is an anion with Valency two?

(A)Sulphate

(B) Carbonate

(C) hydride

(D)Phosphate​

Answer 1

Answer:

a) sulphate is the answer

Answer 2

An anion with Valency two is (A)Sulphate.

Sulphate:

Sulfate anion is an extremely weak base. Because it has valency two and carries a negative charge by gaining electrons from others, sulphate is a divalent anion. Sulphate has the formula $SO_{4} ^{-2}$ and the valency -2. Sulphate is also an anion.

Explanation for incorrect answer:

(B) Carbonate:

The carbonate structure is Due to the negative charge of each O atom, it can combine with an H+ ion to form carbonic acid and the valency is -1.

(C) hydride:

A hydride is the anion of hydrogen, $\({{\rm{H}}^ - }\)$ and it has a valency of -1.

(D)Phosphate:

Phosphate is a phosphoric acid anion, salt, functional group, or ester and it has a valency of- 3.

Hence, Sulphate is an anion with Valency two.