2.335 g of compound X (empirical formal CoH₁₂N₄Cl₃) upon treatment with excess AgNO₃ solution produces 1.435 g of a white precipitate. Determine the primary and secondary valences of cobalt in compound X, respectively.

[Given Atomic mass: Co = 59, Cl = 35.5, Ag = 108]

1.	3, 6	2.	3, 4
3.	2, 4	4.	4, 3

The geometry and magnetic property of ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$, respectively, are

1. Tetrahedral, Paramagnetic

2. Tetrahedral, Diamagnetic

3. Square planar, Paramagnetic

4. Square planar, Diamagnetic

Among
(i) [Cr(en)₃]³⁺
(ii) trans-[Cr(en)₂Cl₂]⁺
(iii) cis-[Cr(en)₂Cl₂]⁺
(iv) [Co(NH₃)₄Cl₂]⁺
the optically active complexes are-

1. (i), (ii) and (iii)

2. (i) and (iii)

3. (ii) and (iii)

4. (ii) and (iv)

Which of the following complexes can exist as facial (fac) and meridional (mer) isomers?

Hybridization and geometry of ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ are

1.  $s{p}^{2}d$ and tetrahedral

2.  $s{p}^3$ and square planar

3.  $s{p}^3$ and tetrahedral

4.  $ds{p}^2$ and square planar

The total number of geometrical isomers possible for an octahedral complex of $\left[{\mathrm{MA}}_2{\mathrm{B}}_2{\mathrm{C}}_2\right]$ is:
(M = transition metal; A, B and C are monodentate ligands)

The IUPAC name of [Co(ONO)(NH₃)₅]Cl₂ is: 

1.  Pentamminenitrocobalt(II)chloride

2.  Pentamminenitrsoocobalt(III)chloride  

3. Pentaamminenitrito-O-cobalt(III)chloride.  

4. Pentammineoxo-nitrocobalt(III)chloride

Which of the following metal carbonyl is paramagnetic in nature?

1. NO₃^- acts as a monodentate ligand.
2. The Ce atom has a coordination number of 12.
3. The shape of the complex ion is an icosahedron.
4. The solution is used as an oxidizing agent.