Chemistry - Coordination Chemistry Question with Solution | TestHub
An aqueous solution of salt (P) gives white precipitate with Barium chloride solution which is insoluble in dilute HCl & dilute . When ammonia (aq) is added to the aqueous solution of salt (P) blue precipitate is obtained which dissolves in excess ammonia producing deep blue colouration due to formation complex (Q). With KCN, (P) gives first a yellow precipitate which quickly decomposes to white precipitate along with liberating highly poisonous gas (R). (R) on hydrogenation produces (S) which gives yellowish orange coloured complex (T) with .
Which of the following options regarding complex Q & T is not correct.
Options:
Answer:
Solution:
Complex Q = and Complex T = .
Statement A is correct: () in Q has one unpaired electron (paramagnetic), while () in T undergoes pairing due to the strong-field ligand 'en' (diamagnetic).
Statement B is correct: Q forms a 4-coordinated square-planar complex (), whereas T forms a 6-coordinated octahedral complex ().
Statement C is correct: Upon 100% dissociation, Q splits into 2 ions () and T splits into 4 ions ().
Therefore, since statements A, B, and C are all completely correct, statement D is false, making (D) the incorrect choice.
