NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

In which of the following oxyanions the oxidation state of central atom is not same as that of its group number in periodic table?

Options

AM n O 4 -
BC r 2 O 7 2 -
CV O 4 3 -
DF e O 4 2 -

Correct answer

D. F e O 4 2 -

Step-by-step solution

A M n O 4 - = + 7 ; A r 18 3 d 5 4 s 2 = 7 B C r 2 O 7 2 - = + 6 ; A r 18 3 d 5 4 s 1 = 6 C V O 4 3 - = + 5 ; A r 18 3 d 3 4 s 2 = 5 D F e O 4 2 - = + 6 ; A r 18 3 d 6 4 s 2 = 8

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