Coordination Compounds - Quiz 2

Coordination Compounds Quiz-2

Dear Readers,

JEE Advanced is a high level exam that checks your concept by putting various types of questions. The questions are in a different format from JEE mains, herein the questions are : single correct multiple choice questions, multiple correct multiple choice questions, statement based questions and comprehension type questions..

Q1. 
[Ni(CN)₄ ]^2- and [Ni(CO)₄]have

•  sp³ hybridised Ni in both cases
•  sp³ and sp² d hybridised Ni
•  dsp² and sp³ hybridised Ni
•  dsp²in both cases

Solution
(c)

[Ni(CN)_4 ]^(2-) ∶ dsp^2 square planar
Ni(CO)_4 ∶ sp^3 tetrahedral

Q2. 
A complex can be formally formed from K₂ [PtCl₄] by which one of the following sequences of substitution of the chloride ions?

•  Py,Br^-,NH₃
•  Br^-,Py,NH₃
•  Br^-,NH₃,Py
•  NH₃,Br^-,Py

Solution
(d)
Ligand strength is in order
Py Thus, replacement of Cl^- ligands by above ligands is in same order

Q3. Consider the following complexes:
I. K₂ PtCl₆ II.PtCl₄∙2NH₃ III.PtCl₄∙3NH₃ IV.PtCl₄∙5NH₃
Their electrical conductances in aqueous solutions are

•  256,0,97,404
•  404,0,97,256
•  256,97,0,404
•  404,97,256,0

Solution
(a)

Q4. Of the following complex ions, the one that probably has the largest overall formation constant, K_f, is

•  [Co(NH₃ )₆ ]^(3+)
•  [Co(H₂ O)₆ ]^(3+)
•  [Co(H₂ O)₄ (NH₃ )₂ ]^(3+)
•  [Co(en)₃ ]^(3+)

Solution
(d) [Co(en)_3 ]^(3+)is most stable due to chelate formation Thus, highest K_f value

Q5.Which of the following complex species is not expected to exhibit optical isomerism?

•  [Co(en)₃ ]^(3+)
•  [Co(en)₂ Cl₂ ]^+
•  [Co(NH₃ )₃ Cl₃]
•  [Co(en)(NH₃ )Cl₂ ]^+

Solution
(b) It does not lack symmetry

Q6. The ions or molecules attached to the central metal atom or ion in a complex are called

•  Ligands
•  Chelates
• Ambident
•  Lewis acid

Solution
(a)

Q7.
[Co(NH₃ )₅ (NO₂ )]²⁺and[Co(NH₃ )₅(ONO)]²⁺will differ in

•  Colour
•  Structure
•  Hybridisation
•  magnetic moment

Solution
(a) Due to different n linkage, of NO_2(metal linked to Co) and ONO (metal linked to Co) they differ in colour

Q8.Potassium diamminedicyanosulphatosuperoxo palatinate (IV) is

•  K[Pt(CN)_2 (O_2 )(SO_4 ) (NH_3 )_2]
•  K_4 [Pt(NH_3 )_2 (CN)_2 (SO_4 )(O_2 )]
•  K_2 [Pt(NH_3 )_2 (CN)_2 (SO_4 (O_2 )]
•  K_3 [Pt(NH_3 )_2 (CN)_2 (SO_4 )(O_2 )]

Solution
(a)

Q9.Arrange the following in order of decreasing number of unpaired electrons
I. [Fe(H_2 O)_6 ]^(2+)II. [Fe(CB)_6 ]^(3-)
III. [Fe(CN)_6 ]^(4-)IV. [Fe(Fe(H_2 O)_6 ]^(3+ )

•  IV, I, II, III
•  I, II, III, IV
•  III, II, I, IV
•  II, III, I, IV

Solution
(a)

Q10. Among the following metal carbonyls, C—O bond order is lowest in

•  [Mn(CO)_6 ]^+
•  [Fe(CO)_5]
•  [Cr(CO)_6]
• [V(CO)_6 ]^-

Solution
(b) Thus, (I) and (IV) are correct