91.

The ratio of anion radius to cation radius of a crystal is 10 : 9.3. Then, the coordination number of the cation in the crystal is

• 2

• 6

• 4

• 8

Which one of the following gives Prussian blue colour?

• Fe₂[Fe(CN)₆]

• Na₄[Fe(CN)₆]

• Fe₃[Fe(CN)₆]₃

• Fe₄[Fe(CN)₆]₃

A coordinate complex contains Co³⁺, Cl^- and NH₃. When dissolved in water, one mole of this complex gave a total of 3 moles of ions. The complex is

• [Co(NH₃)₆]Cl₃

• [Co(NH₃)₅Cl]Cl₂

• [Co(NH₃)₄Cl₂]Cl

• [Co(NH₃)₃Cl₃]

The oxidation state and covalency of Al in [AlCl(H₂O)₅]²⁺ are respectively

• +6,6

• +3,6

• +2,6

• +3,3

When AgNO₃ solution is added in excess to 1M solution of CoCl₃. X NH₃ one mole of AgCl is formed. What is the value of X?

• 1

• 4

• 3

• 2

In which of the following coordination compounds, the central metal ion is in zero oxidation state?

• [Fe(H₂O)₆]Cl₃

• K₄[Fe(CN)₆]

• Fe(CO)₅

• [Fe(H₂O)₆]Cl₂

Match the following

Column I	Column II
(A) sp3	(i) [Co(NH3)6]3+
(B) dsp2	(ii) [Ni(CO)4]
(C) sp3d2	(iii) [Pt(NH3)2Cl2]
(D) d2sp3	(iv) [CoF6]3-
	(v) [Fe(CO)5]

• A    B    C    D

  (v) (ii)  (i)  (iii)

• A    B    C    D

  (ii)  (iii) (iv) (v)

• A    B    C    D

  (ii) (iii) (i)  (v)

• A    B     C     D

  (iii) (ii)  (iv)  (i)

Select the correct IUPAC name [Co(NH₃)₅(CO)₃]Cl.

• Penta ammonia carbonate cobalt (III) chloride

• Pentammine carbonate cobalt chloride

• Pentammine carbonato cobalt (III) chloride

• Cobalt (III) pentammine carbonate chloride

Identify, from the following, the diamagnetic, tetrahedral complex

• [Ni(Cl)₄]^2-

• [Co(C₂O₄)₃]^3-

• [Ni(CN)₄]^2-

• [Ni(CO)₄]

Which type of isomers are [Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br?

• Hydrate isomers

• Ionisation isomers

• Ligand isomers

• Coordination isomers