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CGP EDU Academic Team
Published on: August 11, 2026
An orange solid
Correct Answers for Comprehension Sub-Questions
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Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i) 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.
(ii) (E) = NH 3
Cu 2+ + 4NH 3 ⎯→ [Cu(NH 3 ) 4 ] 2+ (deep blue colouration).
HgCl 2 + NH 3 + H 2 O ⎯→ HgO.Hg(NH 2 )Cl ↓ (white)
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