An orange solid (A) on heating gives a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) on passing over heated Mg gave a white solid (D). (D) on reaction with water gave a gas (E) which formed black preciptate with mercurous nitrate solution.
Select the incorrect statement.

Options

A. The central atom (s) of the anion of solid (A) has `sp^(3)` hybridisation
B. The orange solid (A) is diamagnetic in nature
C. The anion of organe solid (A) is oxidising in nature
D. All metal oxygen bond lengths are equal in anion of solid (A)

Answer

D

Explanation

`A = (NH_(4))_(2) Cr_(2)O_(7)` , all electrons are paired. So diamagnetic `(3d^(0) 4s^(0)) Cr_(2)O_(7)^(2-)` acts as strong oxidising agent in acidic medium