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Coordination Compounds · Question 59

AIPMT 2011 (Mains)MCQEasy📈 Topic in 38% papers+4−1
1

Which of the following complex compounds will exhibit highest paramagnetic behaviour? (At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30)

  1. [Cr(NH3)6]3+
  2. [Co(NH3)6]3+
  3. [Zn(NH3)6]2+
  4. [Ti(NH3)6]3+

Answer

(1) [Cr(NH3)6]3+

Solution

Cr3+: 3d3 ⇒ t2g3 ⇒ 3 unpaired electrons

Co3+: 3d6; NH3 pairs the electrons ⇒ t2g6 ⇒ 0 unpaired electrons

Zn2+: 3d10 ⇒ 0 unpaired electrons

Ti3+: 3d1 ⇒ 1 unpaired electron

∴ [Cr(NH3)6]3+ has the most unpaired electrons, = 3(3+2) = 3.87 BM

Answer: (1)

AIPMT 2011 (Mains)

Keep practising — Coordination Compounds

2

Of the following complex ions, which is diamagnetic in nature?

  1. [NiCl4]2-
  2. [Ni(CN)4]2-
  3. [CuCl4]2-
  4. [CoF6]3-
AIPMT 2011 (Prelims)
3

The complexes [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6] are the examples of which type of isomerism?

  1. Linkage isomerism
  2. Ionization isomerism
  3. Coordination isomerism
  4. Geometrical isomerism
AIPMT 2011 (Prelims)
4

The complex, [Pt(Py)(NH3)BrCl] will have how many geometrical isomers?

  1. 3
  2. 4
  3. 0
  4. 2
AIPMT 2011 (Prelims)
5

The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

  1. [Mn(H2O)6]2+
  2. [Fe(H2O)6]2+
  3. [Co(H2O)6]2+
  4. [Cr(H2O)6]2+
AIPMT 2011 (Prelims)
6

Which of the following carbonyls will have the strongest C–O bond?

  1. Mn(CO)6+
  2. Cr(CO)6
  3. V(CO)6-
  4. Fe(CO)5
AIPMT 2011 (Prelims)
7

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

  1. [Ti(NH3)6]3+
  2. [Cr(NH3)6]3+
  3. [Co(NH3)6]3+
  4. [Zn(NH3)6]2+
AIPMT 2011 (Prelims)
8

Which of the following complex ions is not expected to absorb visible light?

  1. [Ni(CN)4]2-
  2. [Cr(NH3)6]3+
  3. [Fe(H2O)6]2+
  4. [Ni(H2O)6]2+
AIPMT 2010 (Prelims)
9

Crystal field stabilization energy for high spin d4 octahedral complex is

  1. -1.8 0
  2. -1.6 0 + P
  3. -1.2 0
  4. -0.6 0
AIPMT 2010 (Prelims)
10

The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to

  1. linkage isomerism
  2. geometrical isomerism
  3. coordination isomerism
  4. ionization isomerism.
AIPMT 2010 (Prelims)
11

Which one of the following complexes is not expected to exhibit isomerism?

  1. [Ni(NH3)4(H2O)2]2+
  2. [Pt(NH3)2Cl2]
  3. [Ni(NH3)2Cl2]
  4. [Ni(en)3]2+
AIPMT 2010 (Prelims)

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