Which of the following statements about `BF_(4)^(-)` and `AIF_(6)^(3-)` are correct?
(i) B and Al differ in their oxidation states.
(ii) B and Al differ in their covalency.
(iii) B obeys the octet rule.
(iv) B and Al are in diagonal relationship.

Options

A. (i) , (ii)
B. (i), (iii), (iv)
C. (i) , (ii) , (iii)
D. (ii) ,(iii)

Answer

D

Explanation

`BF_(4)^(-)` and ` AlF_(6)^(3-)` have different covalency

`BF_4` contain 8 electron in their octet. Therefore, statement (ii) and (iii) are correct.