Question

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.
A. The central atom(s) of the anion of solid (A) has `sp^(3)` hybridisation.
B. The orange sloid (A) is diamagnetic in nature.
C. The anoin of orange solid (A) is oxidising in nature.
D. None

Answer 1

Correct Answer - D
`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.