1. ⇒ (MHT CET 2023 12th May Morning Shift )

Which from following complexes contains only anionic ligands?

A. Tetraamminedibromoplatinum (IV) bromide

B. Potassium trioxalatoaluminate (III)

C. Pentaaquaisothiocyanatoiron (III) ion

D. Pentaammineaquacobalt (III) iodide

Correct Option is (B)

Potassium trioxalatoaluminate (III): $K_{3} [Al {(C_{2} O_{4})}_{3}]$ Oxalate ion $(C_{2} O_{4}^{2 -})$ is an anionic ligand.

2. ⇒ (MHT CET 2023 11th May Evening Shift )

Identify anionic complex from following.

A. Pentaammineaquacobalt(III) iodide

B. Pentamminecarbonatocabalt(III) chloride

C. Tetracyanonickelate(II) ion

D. Triamminetrinitrocobalt(III)

Correct Option is (C)

$Tetracyanonickelate(II) ion: {[Ni (CN)_{4}]}^{2 -}$

3. ⇒ (MHT CET 2023 11th May Morning Shift )

Which among following complexes is a neutral complex?

A. $[Co (H_{2} O) {({NH}_{3})}_{5}] I_{3}$

B. $[Co {({NO}_{2})}_{3} {({NH}_{3})}_{3}]$

C. $Na [Co {({NO}_{2})}_{6}]$

D. $[Fe {(H_{2} O)}_{3} (NCS)] {Cl}_{2}$

Correct Option is (B)

The complexes in which the coordination sphere does not carry any charge are called neutral complexes. $[Co {({NO}_{2})}_{3} {({NH}_{3})}_{3}]$ is a neutral complex. $[Co (H_{2} O) {({NH}_{3})}_{5}] I_{3}$ and $[Fe {(H_{2} O)}_{3} (NCS)] {Cl}_{2}$ are cationic complexes whereas $Na [Co {({NO}_{2})}_{6}]$ is an anionic complex.

A neutral complex does not have any counter ion (either positive or negative). So, options (A), (C) and (D) can be eliminated.

4. ⇒ (MHT CET 2023 10th May Evening Shift )

Which from following complexes is heteroleptic?

A. $K_{3} [Al {(C_{2} O_{4})}_{3}]$

B. ${[Co {(C_{2} O_{4})}_{3}]}^{3 -}$

C. ${Na}_{3} [{AlF}_{6}]$

D. ${[Co (H_{2} O) {({NH}_{3})}_{5}]}_{3}$

Correct Option is (D)

Complexes in which metal ion is surrounded by more than one type of ligands are heteroleptic. Among the given complexes, option (D) is a heteroleptic complex.

5. ⇒ (MHT CET 2023 10th May Morning Shift )

Identify heteroleptic complex from following.

A. Tetraamminediaquacobalt (III) chloride

B. Hexaamminecobalt (III) bromide

C. Potassium tetrahydroxozincate (II)

D. Tetracarbonyl nickel (0)

Correct Option is (A)

Complex	Formula
Tetraamminediaquacobalt( $III$ ) chloride	$[Co {({NH}_{3})}_{4} {(H_{2} O)}_{2}] {Cl}_{3}$
Hexaamminecobalt $(III)$	$[Co {({NH}_{3})}_{6}] {Br}_{3}$
Potassium tetrahydroxozincate $(II)$	$K_{2} [Zn (OH)_{4}]$
Tetracarbonyl nickel(0)	$[Ni (CO)_{4}]$

⇒Coordination_compound