Coordination Compounds - Quiz 9

Coordination Compounds Quiz-9

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. 
In Which case geometrical isomers is possible with M as metal ion?

•  MX_2 Y_2
•  MX_2 Y_4
•  MX_2 Y_2 Z_2
•  In all cases

Solution
(d)

Q2. 
While Ti^(3+),V^(3+),Fe^(3+) and Co^(2+)afford a large number of tetrahedral complexes, Cr^(3+) never does this, the reason being

•  Cr^(3+) forces high crystal field splitting with a verieties of ligands
•  Crystal field stabilization energy in octahedral vis-à-vis tetrahedral Cr^(3+) system plays the Deciding role
•  The ionic radius of Cr^(3+) is the largest among the other M^(3+) ions mentioned
•  Electronegativity of Cr^(3+) is the largest among these trivalent 3d- metals and so chromium prefers to be associated with as many ligands as its ionic radius permits

Solution
(b)

Q3. In an octahedral complex , if ligands on one axis are displaced little away from their ideal positions the crystal field splitting of d-orbitals for this complex is as given below
d_(x^2-y^2 ) d_(z^2 ) d_xy d_yz d_xz
The ligands are displaced on which axis/axes

•  x-and y
•  y-only
•  x-only
•  z-only

Solution
(a)

Q4. Of the following complex ions, one exhibits isomerism. That is

•  [Ag(NH_3 )_2 ]^+
•  [Co(NH_3 )_5 NO_2 ]^(2+)
•  [Pt(en)Cl_2]
•  [Co(NH_3 )_5 Cl]^(2+)

Solution
(b)

Q5.A compound has the empirical formula CoCl_3∙5NH_3, When an aqueous solution of this compound is mixed with excess silver nitrate, 2 moles ofAgCl precipitate per mol of compound. On reaction with excess HClno NH_4^+ is detected. Hence, it is

•  [Co(NH_3 )_5 Cl_2 ]Cl
•  [Co(NH_3 )_5 Cl]Cl_2
•  [Co(NH_3 )_5 Cl_3]
•  [Co(NH_3 )_4 Cl_2 ]Cl∙NH_3

Solution
(b)

Q6. Hexammine platinum (IV) tetrachloroplatinate (II) is

•  [Pt(NH_3 )_6 ] [PtCl_4 )_3]
•  [Pt(NH_3 )_6 [PtCl_4]
• [Pt(NH_3 )_6 ] [PtCl_4 ]_2
•  [Pt(NH_3 )_6 ] [PtCl_4 ]_2

Solution
(c)

Q7.The crystal field-splitting for Cr^(3+ ), ion in octahedral field increases for ligands I^-,H_2 O,NH_3,CN^- and the order is

•  I^-<H_2 O<NH_3<CN^-
•  CN^-<I^-<H_2 O<NH_3)
•  CN^-<NH_3<H_2 O<I^-
•  NH_3<H_2 O<I^-<CN^-

Solution
(a)

Q8.For the complex ML_2, stepwise formation constants for M+L ⇌ML ML+L ⇌ML_2 are 4 and 3. Hence, overall stability constant for M+2L ⇌ML_2 is

•  12
•  7
•  1.33
•  0.75

Solution
(a)

Q9.The formula of a carbonyl complex of cobalt,(CO)_n Co-Co(CO)_n,in which there a single covalent Co-Cobond is

•  Co_2 (CO)_4
•  Co_2 (CO)_6
•  Co_2 (CO)_8
•  Co_2 (CO)_10

Solution
(c)

Q10. The spin only magnetic moment value (in Bohr magneton units) of Cr(CO)_6is

•  0
•  2.84
•  4.9
• 5.92

Solution
(a)