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Coordination Compounds · Question 54

NEET 2013 (Karnataka)MCQEasy📈 Topic in 38% papers+4−1
1

Which is diamagnetic?

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

Answer

(2) [Ni(CN)4]2-

Solution

(1) [CoF6]3-: Co3+ is 3d6; F- is a weak field ligand, so sp3d2 (outer orbital) with 4 unpaired electrons ⇒ paramagnetic.

(2) [Ni(CN)4]2-: Ni2+ is 3d8; strong field CN- pairs the electrons, dsp2, square planar, no unpaired electron ⇒ diamagnetic.

(3) [NiCl4]2-: Ni2+ (3d8) with weak field Cl-, sp3, tetrahedral, 2 unpaired electrons ⇒ paramagnetic.

(4) [Fe(CN)6]3-: Fe3+ is 3d5; even after pairing (d2sp3) 1 unpaired electron remains ⇒ paramagnetic.

∴ As per NCERT, square planar [Ni(CN)4]2- is diamagnetic while tetrahedral [NiCl4]2- is paramagnetic.

Answer: (2)

NEET 2013 (Karnataka)

Keep practising — Coordination Compounds

2

Low spin complex of d6-cation in an octahedral field will have the following energy

  1. -125 o + P
  2. -125 o + 3P
  3. -25 o + 2P
  4. -25 o + P
AIPMT 2012 (Mains)
3

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true? [figure]

  1. Red complex has a square planar geometry.
  2. Complex has symmetrical H-bonding.
  3. Red complex has a tetrahedral geometry.
  4. Dimethylglyoxime functions as bidentate ligand.
AIPMT 2012 (Mains)
4

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

  1. [Ni(NH3)6]2+
  2. [Zn(NH3)6]2+
  3. [Cr(NH3)6]3+
  4. [Co(NH3)6]3+
AIPMT 2012 (Prelims)
5

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

  1. Cr(CO)6
  2. Fe(CO)5
  3. [Mn(CO)6]+
  4. [V(CO)6]-
AIPMT 2011 (Mains)
6

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+
AIPMT 2011 (Mains)
7

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)
8

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)
9

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

  1. 3
  2. 4
  3. 0
  4. 2
AIPMT 2011 (Prelims)
10

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)
11

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)

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