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Coordination Compounds · Question 56

AIPMT 2012 (Mains)MCQEasy📈 Topic in 0% papers+4−1
1

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.

Answer

(3) Red complex has a tetrahedral geometry.

Solution

Ni2+ + 2 dmgH (in ammoniacal medium) ⇒ [Ni(dmgH)2], a red precipitate (used as a test and for estimation of Ni2+).

(1) Ni2+ (3d8) with the strong field dmg ligand undergoes dsp2 hybridisation ⇒ square planar, diamagnetic ⇒ true.

(2) The O–H···O hydrogen bonds between the oxime groups of the two ligands are symmetrical ⇒ true.

(3) The complex is not tetrahedral ⇒ this statement is not true.

(4) Each dimethylglyoximate ion binds through its two N atoms ⇒ bidentate ligand ⇒ true.

Answer: (3)

AIPMT 2012 (Mains)

Keep practising — Coordination Compounds

2

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)
3

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)
4

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)
5

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)
6

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)
7

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

  1. 3
  2. 4
  3. 0
  4. 2
AIPMT 2011 (Prelims)
8

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)
9

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)
10

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)
11

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)

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