The compounds [Co(SO${}_4$ (NH${}_3$)${}_5$ ]Br and [Co(SO${}_4$ (NH${}_3$)${}_5$] Cl classified as:

1.	Linkage isomerism	2.	Ionisation isomerism
3.	Coordination isomerism	4.	No isomerism

Which of the following species is not expected to be a ligand?

1.  NO

2.  NH${}_4^{+}$

3.  NH${}_2$CH${}_2$CH${}_2$NH${}_2$

4.  CO

Which of the following species is not expected to be a ligand?

1. NO

2. NH${}_4^{+}$

3. ${\mathrm{NH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2$

4. CO

What kind of isomerism exists between [Cr(H₂O)₆]Cl₃ (violet) and [Cr(H₂O)₅Cl]Cl₂⋅H₂O (greyish-green)?

1. Linkage isomerism

2. Solvate isomerism

3. lonisation isomerism

4. Coordination isomerism

IUPAC name of $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2\mathrm{Cl}\right({\mathrm{NO}}_2\left)\right]$ is:

1. Platinum diaminechloronitrite

2. Chloronitrito-N-ammineplatinum (ll)

3. Diamminechloridonitrito-N-platinum (ll)

4. Diamminechloronitrito-N-platinate (ll)

Atomic number of Mn Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?

a. ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

b. ${\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$

c.  ${\left[Fe{\left(CN\right)}_6\right]}^{4-}$

d.  ${\left[\mathrm{Fe}{\left(CN\right)}_6\right]}^{3-}$

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Identify the outer orbital octahedral complexes among the following that have the same number of unpaired electrons:
(Atomic numbers of Mn, Fe, Co, and Ni are 25, 26, 27, and 28 respectively)

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Which of the following options are correct for ${\left[Fe{\left(CN\right)}_6\right]}^{3-}$ is: 

a.  $d^{2}s{p}^3$ hybridisation 

b.  $d^{2}s{p}^2$ hybridisation 

c.  Paramagnetic 

d.  Diamagnetic

Choose the correct option:

An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl. This is because ........

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Which of the following complex is/are homoleptic:

Choose the correct option.
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)