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Coordination Compounds · Question 44

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 12% papers+4−1
1

Which of these statements about [Co(CN)6]3- is true?

  1. [Co(CN)6]3- has four unpaired electrons and will be in a high-spin configuration.
  2. [Co(CN)6]3- has no unpaired electrons and will be in a high-spin configuration.
  3. [Co(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.
  4. [Co(CN)6]3- has four unpaired electrons and will be in a low-spin configuration.

Answer

(3) [Co(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.

Solution

In [Co(CN)6]3-: x + 6(-1) = -3 ⇒ x = +3; Co3+: 3d6

CN- is a strong field ligand ⇒ o > P ⇒ electrons pair up in t2g

⇒ Configuration t2g6 eg0 ⇒ no unpaired electrons, low-spin (inner orbital, d2sp3) complex, diamagnetic.

Answer: (3)

AIPMT 2015 (Cancelled)

Keep practising — Coordination Compounds

2

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

  1. [Mn(H2O)6]3+
  2. [Fe(H2O)6]3+
  3. [Co(H2O)6]2+
  4. [Co(H2O)6]3+
AIPMT 2014
3

Which of the following complexes is used as an anticancer agent?

  1. mer-[Co(NH3)3Cl3]
  2. cis-[PtCl2(NH3)2]
  3. cis-K2[PtCl2Br2]
  4. Na2CoCl4
AIPMT 2014
4

A magnetic moment of 1.73 BM will be shown by one among the following

  1. TiCl4
  2. [CoCl6]4-
  3. [Cu(NH3)4]2+
  4. [Ni(CN)4]2-
NEET 2013
5

An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be

  1. 0.003
  2. 0.01
  3. 0.001
  4. 0.002
NEET 2013
6

Crystal field splitting energy for high spin d4 octahedral complex is

  1. -1.2 o
  2. -0.6 o
  3. -0.8 o
  4. -1.6 o
NEET 2013 (Karnataka)
7

In a particular isomer of [Co(NH3)4Cl2]+, the Cl-Co-Cl angle is 90 , this isomer is known as

  1. optical isomer
  2. cis-isomer
  3. position isomer
  4. linkage isomer.
NEET 2013 (Karnataka)
8

The anion of acetylacetone (acac) forms Co (acac)3 chelate with Co3+. The rings of the chelate are

  1. five membered
  2. four membered
  3. six membered
  4. three membered.
NEET 2013 (Karnataka)
9

The correct IUPAC name for [CrF2(en)2]Cl is

  1. chloro difluorido ethylene diaminechromium (III) chloride
  2. difluoridobis (ethylene diamine) chromium (III) chloride
  3. difluorobis-(ethylene diamine) chromium (III) chloride
  4. chloro difluoridobis (ethylene diamine) chromium (III)
NEET 2013 (Karnataka)
10

Which among the following is a paramagnetic complex?

  1. [Co(NH3)6]3+
  2. [Pt(en)Cl2]
  3. [CoBr4]2-
  4. Mo(CO)6
NEET 2013 (Karnataka)
11

Which is diamagnetic?

  1. [Co(F)6]3-
  2. [Ni(CN)4]2-
  3. [NiCl4]2-
  4. [Fe(CN)6]3-
NEET 2013 (Karnataka)

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