Werner conducted many experiments to establish the formula of complexes, one of these were conductivity measurements. On the basis of the experiments performed, he obtained the following values of conductivity for different type of complexes. Type of complex Electrical Conductivity Nonelectrolyte 0 - 10 (due to impurities) 1 : 1 Electrolyte 90 - 130 1 : 2 or 2 : 1 Electrolyte 230 - 290 1 : 3 or 3 : 1 Electrolyte 390 - 450 1 : 4 Electrolyte 500 - 550 On the basis of above table, match the following two columns. Column A Column B Formula of compound Conductivity Correct Werner's Representation ( a ) PtCl 4 . 2 NH 3 6 . 99 ( i ) Cr NH 3 5 Cl Cl 2 ( b ) PtCl 4 . NH 3 . KCl 106 . 8 ( ii ) Co NH 3 5 Br Br 2 ( c ) CrCl 3 . 5 NH 3 260 . 2 ( iii ) Cr NH 3 6 Cl 3 ( d ) PtCl 4 . 2 KCl 256 . 8 ( iv ) Pt NH 3 2 Cl 4 ( e ) CrCl 3 . 6 NH 3 441 . 7 ( v ) Pt NH 3 6 Cl 4 ( f ) PtCl 4 . 6 NH 3 522 . 9 ( vi ) Pt NH 3 3 Cl 3 Cl ( g ) CoBr 3 . 5 NH 3 257 . 6 ( vii ) K 2 PtCl 6 ( h ) PtCl 4 . 3 NH 3 96 . 8 ( vii ) K Pt NH 3 Cl 5

Column A Column B Formula of compound Conductivity Correct Werner's Representation ( a ) PtCl 4 . 2 NH 3 6 . 99 ( iv ) Pt NH 3 2 Cl 4 ( b ) PtCl 4 . NH 3 . KCl 106 . 8 ( vii ) K Pt NH 3 Cl 5 ( c ) CrCl 3 . 5 NH 3 260 . 2 ( i ) Cr NH 3 5 Cl Cl 2 ( d ) PtCl 4 . 2 KCl 256 . 8 ( vii ) K 2 PtCl 6 ( e ) CrCl 3 . 6 NH 3 441 . 7 ( iii ) Cr NH 3 6 Cl 3 ( f ) PtCl 4 . 6 NH 3 522 . 9 ( v ) Pt NH 3 6 Cl 4 ( g ) CoBr 3 . 5 NH 3 257 . 6 ( ii ) Co NH 3 5 Br Br 2 ( h ) PtCl 4 . 3 NH 3 96 . 8 ( vi ) Pt NH 3 3 Cl 3 Cl

Which of the following complexes will show geometrical isomerism?

Aquachlorobis(ethylenediamine)cobalt(II)chloride

Potassium tris(oxalato)chromate(III)

Pentaaquachlorochromium(II)chloride

Potassiumamminetrichloroplatinate(II)

The correct option(s) regarding the complex Co en NH 3 3 H 2 O 3 + is (are) (en = H 2 NCH 2 CH 2 NH 2 )

It absorbs light at longer wavelength as compared to Co en NH 3 4 3 +

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: F e = 26 , N i = 28 )

Metal - carbon bond strengthens when the oxidation state of the metal is lowered

Total number of valence shell electrons at metal center in Fe CO 5 or Ni CO 4 is 16

The carbonyl C - O bond weakens when the oxidation state of the metal is increased

The correct combination is

NiCl 4 2 - - paramagnetic; Ni ( CO ) 4 - tetrahedral

NiCl 4 2 - - Square planar; Ni ( CN ) 4 2 - - paramagnetic

Ni ( CN ) 4 2 - - tetrahedral; Ni ( CO ) 4 2 - - paramagnetic

NiCl 4 2 - - diamagnetic; Ni ( CO ) 4 - square-planar

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IMPORTANT

Earn 100

Write down the formulae of the following compounds.

$(a)$ diamminetriaquahydroxidochromium $(III)$ nitrate

$(b)$ tetrakis(pyridine)platinum $(II)$ tetraphenylborate $(III)$

$(c)$ dibromidotetracarbonyliron $(II)$

$(d)$ ammonium diamminetetrakis(isothiocyanato)chromate $(III) .$

$(e)$ pentaamminedinitrogenruthenium $(II)$ chloride

$(f)$ barium dihydroxidodinitrito- $O$ -oxalatozirconate $(IV)$

$(g)$ tetrapyridineplatinum $(II)$ tetrachloridonickelate $(II)$

Important Questions on Coordination Compounds

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 13

Werner conducted many experiments to establish the formula of complexes, one of these were conductivity measurements. On the basis of the experiments performed, he obtained the following values of conductivity for different type of complexes.

Type of complex	Electrical Conductivity
Nonelectrolyte	$0 - 10$ (due to impurities)
$1 : 1$ Electrolyte	$90 - 130$
$1 : 2$ or $2 : 1$ Electrolyte	$230 - 290$
$1 : 3$ or $3 : 1$ Electrolyte	$390 - 450$
$1 : 4$ Electrolyte	$500 - 550$

On the basis of above table, match the following two columns.

Column $A$		Column $B$
Formula of compound		Conductivity	Correct Werner's Representation
$(a)$	${PtCl}_{4} . 2 {NH}_{3}$	$6.99$	$(i) [Cr {({NH}_{3})}_{5} Cl] {Cl}_{2}$
$(b)$	${PtCl}_{4} . {NH}_{3} . KCl$	$106.8$	$(ii) [Co {({NH}_{3})}_{5} Br] {Br}_{2}$
$(c)$	${CrCl}_{3} . 5 {NH}_{3}$	$260.2$	$(iii) [Cr {({NH}_{3})}_{6}] {Cl}_{3}$
$(d)$	${PtCl}_{4} . 2 KCl$	$256.8$	$(iv) [Pt {({NH}_{3})}_{2} {Cl}_{4}]$
$(e)$	${CrCl}_{3 .} 6 {NH}_{3}$	$441.7$	$(v) [Pt {({NH}_{3})}_{6}] {Cl}_{4}$
$(f)$	${PtCl}_{4 .} 6 {NH}_{3}$	$522.9$	$(vi) [Pt {({NH}_{3})}_{3} {Cl}_{3}] Cl$
$(g)$	${CoBr}_{3 .} 5 {NH}_{3}$	$257.6$	$(vii) K_{2} [{PtCl}_{6}]$
$(h)$	${PtCl}_{4} . 3 {NH}_{3}$	$96.8$	$(vii) K [Pt ({NH}_{3}) {Cl}_{5}]$

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 14

1 g

of complex

[Cr {(H_{2} O)}_{5} Cl] {Cl}_{2} \cdot H_{2} O

was passed through a cation exchanger to produce

HCl .

The acid liberated was diluted to

1

liter. What will be the molarity of the acidic solution? [Molecular weight of complex

= 266.5

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 15

Calculate the $EAN$ of central atom in the following complexes.

$(a)$ $[Cr (CO)_{6}]$

$(b)$ ${[Fe (CN)_{6}]}^{4 -}$

$(c)$ $[Fe (CO)_{5}]$

$(d)$ ${[Co {({NH}_{3})}_{6}]}^{3 +}$

$(e)$ $[Ni (CO)_{4}]$

$(f)$ ${[Cu (CN)_{4}]}^{3 -}$

$(g)$ ${[Pd {({NH}_{3})}_{6}]}^{4 +}$

$(h)$ ${[{PtCl}_{6}]}^{2 -}$

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 16

Arrange the following compounds in order of increasing molar conductivity.

$(i) K [Co {({NH}_{3})}_{2} {({NO}_{2})}_{4}]$

$(ii) [Cr {({NH}_{3})}_{3} {({NO}_{2})}_{3}]$

$(iii) {[Cr {({NH}_{3})}_{5} ({NO}_{2})]}_{3} {[Co {({NO}_{2})}_{6}]}_{2}$

$(iv) [Cr {({NH}_{3})}_{6}] {Cl}_{3}$

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 17

A metal complex having composition

Cr {({NH}_{3})}_{4} {Cl}_{2} Br

has been isolated in two forms

A

and

B .

The form

A

reacts with

{AgNO}_{3}

to give a white precipitate readily soluble in dilute aqueous ammonia, whereas

B

gives a yellow precipitate soluble in concentrated ammonia.

(i)

Write the formulae of

A

and

B .

(ii)

State hybridisation of chromium in each.

(iii)

Calculate their magnetic moments for each (spin-only value).

(iv)

Calculate the

EAN

for both.

(v)

Will they conduct electricity or not?

(iv)

Write the formula of the complexes formed when the precipitates dissolve in aqueous ammonia and the concentrated ammonia, respectively.

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 18

Predict the hybridisation and/geometry of the following complexes.

$(a)$ ${[{NiBr}_{4}]}^{2 -}$

$(b)$ ${[{AuCl}_{4}]}^{-}$

$(c)$ ${[Pt {({NH}_{3})}_{4}]}^{2 +}$

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 19

For the complex $K_{2} [Cr (NO) ({NH}_{3}) (CN)_{4}]; μ = 1.73 BM$

$(i)$ Write the IUPAC name.

$(ii)$ What will be structure?
$(iii)$ How many unpaired electrons are present in the central metal ion?

$(iv)$ Is it paramagnetic or diamagnetic?

$(v)$ Calculate the $EAN$ EAN of the complex.

$(vi)$ What will be the hybridisation of the complex?

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 20

Predict the hybridisation and geometry of the following complexes.

$(a)$ ${[Fe (CN)_{6}]}^{3 -}$

$(b)$ ${[{MnBr}_{4}]}^{2 -}$

$(c)$ ${[Fe {(H_{2} O)}_{6}]}^{2 +}$

$(d)$ ${[Co (SCN)_{4}]}^{2 -}$

$(a)$	diamminetriaquahydroxidochromium $(III)$ nitrate
$(b)$	tetrakis(pyridine)platinum $(II)$ tetraphenylborate $(III)$
$(c)$	dibromidotetracarbonyliron $(II)$
$(d)$	ammonium diamminetetrakis(isothiocyanato)chromate $(III) .$
$(e)$	pentaamminedinitrogenruthenium $(II)$ chloride
$(f)$	barium dihydroxidodinitrito- $O$ -oxalatozirconate $(IV)$
$(g)$	tetrapyridineplatinum $(II)$ tetrachloridonickelate $(II)$

Important Questions on Coordination Compounds

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