Question

Which pair of species represent divalent polyatomic anions?

• A. Nitrate, Sulfate
• B. Sulfate, Manganate
• C. Borate, Aluminate
• D. Borate, Phosphate

Answer 1

The correct option is B

Sulfate, Manganate

Anions: These are the type of ions which are having negative charge over them.

Divalent polyatomic anions: These are the type of polyatomic anions having a negative charge equal to two.

The explanation for correct option:

Option(b)

• Sulfate is represented as having 2 negative charges.
• Manganate is represented as ${\mathrm{MnO}}_4^{2-}$also having 2 negative charges.

The explanation for the incorrect options:

Option(a)

• Nitrate is represented as ${\mathrm{NO}}_3^{-}$ and is monovalent, not divalent anion.
• Sulfate is represented as having 2 negative charges.

Option(c)

• Borate is represented as ${\mathrm{BO}}_3^{3-}$and is trivalent, not divalent.
• Aluminate is represented as ${\mathrm{AlO}}_2^{-}$and is monovalent, not divalent.

Option(d)

• Borate is represented as ${\mathrm{BO}}_3^{3-}$and is trivalent, not divalent.
• Phosphate is represented as ${\mathrm{PO}}_4^{3-}$and is trivalent, not divalent.

Therefore, correct option is option (b).