The coordination number and oxidation state of Cr in K₃[Cr(C₂O₄)₃] are respectively

1. 3 and +3

2. 3 and 0

3. 6 and +3

4. 4 and +2

The coordination number of cobalt in[Co(en)₂Br₂]Cl₂ is:

1. 2

2. 4

3. 6

4. 8

A solution containing 2.675 g of CoCl₃.6NH₃ (molar mass = 267.5 g mol^-1) is passed through a cation exchanger. The chloride ions obtained in the solution were treated with an excess of AgNO₃ to give 4.78 g of AgCl. Formula of the complex is (Atomic mass of Ag = 108u) :

1. [CoCl(NH₃)₅]Cl₂

2. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$

3. [CoCl₂(NH₃)₄]Cl

4. [CoCl₃(NH₃)₃]

The primary valency of Fe in K₃[Fe(CN)₆] is:

1. 3

2. 2

3. 1

4. zero

The compound that will exhibit maximum ionic conductivity in aqueous solution is: 

1. K₄[Fe(CN)₆]

2. [Co(NH₃)₆]Cl₃

3. [Cu(NH₃)₄]Cl₂

4. [Ni(CO)₄]

Mixture of X=0.02mole of [Co(NH₃)₅SO₄]Br and 0.02 mole of [Co(NH₃)₅Br]SO₄ was prepared in 2 litre of solution.

1 litre mixture X+excess AgNO₃$\to$Y

1 Litre mixture X +excess BaCl₂$\to$Z

No. of moles of Y and Z are :

1. 0.01,0.01

2. 0.02, 0.01

3. 0.01,0.02

4. 0.02,0.02

If excess of AgNO₃ solution is added to 100ml of 0.024M Solution of dichlorobis(ethylene diamine) cobalt(III) Choloride, how many moles of AgCl will be precipitated?

1. 0.0012

2. 0.0016

3. 0.0024

4. 0.0048

The correct order of the stoichiometrics of AgCl formed when AgNO₃ in excess is treated with the complexes:- CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃, respectively, is :

1. 1 AgCl, 3 AgCl, 2 AgCl

2. 3 AgCl, 1 AgCl, 2 AgCl

3. 3 AgCl, 2 AgCl, 1 AgCl

4. 2 AgCl, 3AgCl,  1 AgCl

The number of ions produced in water by the dissolution of the complex having the empirical formula [Co(NH₃)₄Cl₂]CI is: 

1.  1

2.  2

3.  4

4.  3