Which of the following facts about the complex $[\mathrm{Cr}(\mathrm{NH}_{3})_{6}]\mathrm{Cl}_{3}$ is wrong ?

(B) The complex is an outer orbital complex

(A) The complex is paramagnetic

(C) The complex gives white precipitate with silver nitrate solution

(D) The complex involves $d^{2} s p^{3}$ hybridization and is octahedral in shape.

JEE Main · 2011 · 10 Apr 2011 · Offline · Coordination Compounds

Which of the following facts about the complex

[Cr (NH_{3})_{6}] Cl_{3}

is wrong ?

(A)The complex is paramagnetic
(B)The complex is an outer orbital complex✓ Correct
(C)The complex gives white precipitate with silver nitrate solution
(D)The complex involves $d^{2} s p^{3}$ hybridization and is octahedral in shape.

Answer: (B)

Solution

[Cr (N H_{3})_{6}] C l_{3}

the metal is

C r^{3 +}

, a

3 d^{3}

ion, and ammonia drives

d^{2} s p^{3}

hybridisation using the inner

3 d

orbitals, so the complex is an inner-orbital octahedral complex, not an outer-orbital one as claimed. It is paramagnetic from its three unpaired

d

electrons, octahedral in shape, and its three ionisable chlorides give a white precipitate with silver nitrate; the description of it as an outer-orbital complex is the wrong statement.

JEE Main · 2011 · 10 Apr 2011 · Offline · Single correct option

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JEE Main · 2011 · 10 Apr 2011 · Offline · Coordination Compounds

Solution

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