Name the following compounds ( a ) Co NH 3 6 Cl 3 Prepared in 1798 by B . M . Tassaert and considered to be first complex salt prepared. ( b ) Rh NH 3 5 I I 2 A yellow coloured complex obtained by heating Rh NH 3 5 H 2 O I 3 above 100 ° C . ( c ) Fe ( CO ) 5 A highly toxic volatile liquid. ( d ) Fe C 2 O 4 3 3 - The ion formed when Fe 2 O 3 rust is dissolved in oxalic acid, H 2 C 2 O 4 . ( e ) Cu NH 3 4 SO 4 A deep blue compound obtained when CuSO 4 is treated with excess of NH 3 . ( f ) Na Cr ( OH ) 4 The compound formed when Cr ( OH ) 3 precipitate is dissolved in excess of NaOH . ( g ) Co ( gly ) 3 A complex that contains the anion of amino acid, glycine. ( h ) Fe H 2 O 5 ( SCN ) 2 + The red complex ion formed in the qualitative analysis test of Fe 3 + ion. ( i ) K 2 HgI 4 Alkaline solution of this complex is called Nessler's Reagent. ( j ) Co Hg ( SCN ) 4 Deep blue crystalline precipitate obtained in qualitative detection of Hg 2 + ( k ) Fe 4 Fe ( CN ) 6 3 Prussian blue, deep blue coloured complex obtained in detection of Fe 2 + ( l ) K 3 Co NO 2 6 Potassium cobaltinitrite or Fischer salt yellow precipitate obtained in detection of Co 2 + ( m ) Ni ( dmg ) 2 Rosy red precipitate obtained in detection of Ni 2 + ions. ( n ) K 2 PtCl 6 Yellow precipitate obtained in detection of potassium ions. ( o ) Na 2 Fe ( CN ) 5 NO + Sodium nitroprusside used for detection of sulphide ions/sulphur. ( p ) Fe H 2 O 5 NO + SO 4 Brown ring complex, obtained in detection of Fe + 1 ions. ( q ) Cu ( CN ) 4 3 - Colourless stable soluble complex obtained in detection of Cu 2 + on adding excess of KCN solution. ( r ) NH 4 2 PtCl 6 Only few compounds of ammonium ions are precipitate this is one of these, a yellow precipitate.

( a ) Co NH 3 6 Cl 3 Hexaaminecobalt( III ) chloride ( b ) Rh NH 3 5 I I 2 Pentaammineiodorhodium( III ) iodide ( c ) Fe ( CO ) 5 Pentacarbonyliron( 0 ) ( d ) Fe C 2 O 4 3 3 - Trioxalatoferrate( III ) ( e ) Cu NH 3 4 SO 4 Tetraamminecopper( II ) sulphate ( f ) Na Cr ( OH ) 4 Sodium tetraaquachromium( III ) ( g ) Co ( gly ) 3 Tris(glycinato)cobalt( III ) ( h ) Fe H 2 O 5 ( SCN ) 2 + Pentaaquathiocyanato–N–iron( III ) ( i ) K 2 [ HgI 4 ] Potassium tetraiodomercurate( II ) ( j ) Co Hg ( SCN ) 4 Cobalt( II ) tetrathiocyanato–S–mercurate( II ) ( k ) Fe 4 Fe ( CN ) 6 3 Iron ( III ) hexacyanidoferrate ( II ) ( l ) K 3 Co NO 2 6 Potassium hexanitritocobaltate ( III ) ( m ) Ni ( dmg ) 2 Nickel bis(dimethylglyoximate) ( n ) K 2 PtCl 6 potassium hexachloroplatinate( IV ). ( o ) Na 2 Fe ( CN ) 5 NO + sodiumpentacyanidonitrosoniumferrate( II ) ( p ) Fe H 2 O 5 NO + SO 4 penta aquanitrosylium iron ( I ) sulphate. ( q ) Cu ( CN ) 4 3 - tetracyanocuprate( I ) ion ( r ) NH 4 2 PtCl 6 Ammonium hexachloroplatinate( IV )

Write down the formulae of the following compounds ( a ) Tetraamminezinc ( II ) Nitrate The compound formed when zinc nitrate is treated with an excess of ammonia ( b ) Tetracarbonylnickel ( 0 ) The first metal carbonyl(prepared in 1888 ) and an important compound in the industrial refining of nickel metal ( c ) Potassium amminetrichloridoplatinate ( II ) A compound that contains a square planar anion ( d ) Dicyanidoaurrate ( I ) ion An ion important in the extraction of gold from its ores ( e ) Sodium hexafluoridoaluminate ( III ) Called cryolite, used in the electrolytic refining of aluminium ( f ) Diamminesilver ( I ) ion lon formed when AgCl is dissolved in excess of ammonia

( a ) Tetraamminezinc ( II ) Nitrate Zn ( NH 3 ) 4 ] ( NO 3 ) 2 The compound formed when zinc nitrate is treated with an excess of ammonia. ( b ) Tetracarbonylnickel ( 0 ) Ni ( CO ) 4 The first metal carbonyl(prepared in 1888 ) and an important compound in the industrial refining of nickel metal. ( c ) Potassium amminetrichloridoplatinate ( II ) K [ PtCl 3 ( NH 3 ) ] A compound that contains a square planar anion. ( d ) Dicyanidoaurrate ( I ) ion Au ( CN ) 2 An ion important in the extraction of gold from its ore. ( e ) Sodium hexafluoridoaluminate ( III ) Na 3 [ AlF 6 ] Called as cryolite, used in the electrolytic refining of aluminium. ( f ) Diamminesilver ( I ) ion [ Ag ( NH 3 ) 2 ] Ion formed when AgCl is dissolved in excess of ammonia.

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 )

( a ) diamminetriaquahydroxidochromium ( III ) nitrate [ Cr ( OH ) ( H 2 O ) 3 ( NH 3 ) 2 ] ( NO 3 ) 2 ( b ) tetrakis(pyridine)platinum ( II ) tetraphenylborate ( III ) [ Pt ( Py ) 4 ] [ B ( ph ) 4 ] 2 ( c ) dibromidotetracarbonyliron ( II ) [ Fe ( Br ) 2 ( CO ) 4 ] ( d ) ammonium diamminetetrakis(isothiocyanato)chromate ( III ) . ( NH 4 ) [ Cr ( SCN ) 4 ( NH 3 ) 2 ] ( f ) barium dihydroxidodinitrito- O -oxalatozirconate ( IV ) Ba [ Zr ( OH ) 2 ( ONO ) 2 ( ox ) ] ( g ) tetrapyridineplatinum ( II ) tetrachloridonickelate ( II ) [ Pt ( py ) 4 ] [ NiCl 4 ]

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

HARD

JEE Main/Advance

IMPORTANT

Earn 100

Write the name of the following ligands and classify their denticity.

$(a)$ ${CH}_{3} NC$

$(b)$ ${acac}^{- 1}$

$(c)$ $N_{3}^{-}$

$(d)$ $dien$

$(e)$ ${edta}^{4 -}$

$(f)$ ${dmg}^{- 1}$

$(g)$ ${NC}^{-}$

$(h)$ ${NO}_{2}^{-}$

$(i)$ $O^{2 -}$

$(j)$ $O_{2}^{-}$

Important Questions on Coordination Compounds

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 7

Predict the different ligating sites by drawing structures in the following ligands.

$(a)$ ${({NO}_{2})}^{-}$

$(b)$ $(SCN)^{-}$

$(c)$ ${(C_{2} O_{2} S_{2})}^{2 -}$

$(d)$ $(OCN)^{-}$

$(e)$ $(NOS)^{-}$

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 8

$(a)$ Determine the denticity of the ligands in complexes ${[Fe {(C_{2} O_{4})}_{3}]}^{3 -}$ and $[Pt (en) z]^{2 +} .$ What are the coordination numbers and the oxidation numbers of the central metal ion?

$(b)$ Designate the coordination entities and counter ions in the coordination compounds.

$K_{2} [Ni (CN)_{4}]; [Cr (en)_{3}] {Cl}_{3}; {Fe}_{4} {[Fe (CN)_{6}]}_{3}; [{PtCl}_{2} (en)_{2}] {({NO}_{3})}_{2}$

$(c)$ Identify the Lewis acid and Lewis base components of the following complexes.

$(i)$ ${[{HgBr}_{4}]}^{2 -}$

$(ii)$ ${[Ni {(H_{2} O)}_{6}]}^{2 +}$

$(iii)$ $[{PdCl}_{2} {({NH}_{3})}_{2}]$

$(iv)$ ${[Al (OH)_{4}]}^{-}$

$(v)$ ${[Ag (CN)_{2}]}^{-}$

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

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 9

Name the following compounds

$(a)$	$[Co {({NH}_{3})}_{6}] {Cl}_{3}$	Prepared in $1798$ by $B . M .$ Tassaert and considered to be first complex salt prepared.
$(b)$	$[Rh {({NH}_{3})}_{5} I] I_{2}$	A yellow coloured complex obtained by heating $[Rh {({NH}_{3})}_{5} (H_{2} O)] I_{3}$ above $100 ° C .$
$(c)$	$[Fe (CO)_{5}]$	A highly toxic volatile liquid.
$(d)$	${[Fe {(C_{2} O_{4})}_{3}]}^{3 -}$	The ion formed when ${Fe}_{2} O_{3}$ rust is dissolved in oxalic acid, $H_{2} C_{2} O_{4} .$
$(e)$	$[Cu {({NH}_{3})}_{4}] {SO}_{4}$	A deep blue compound obtained when ${CuSO}_{4}$ is treated with excess of ${NH}_{3} .$
$(f)$	$Na [Cr (OH)_{4}]$	The compound formed when $Cr (OH)_{3}$ precipitate is dissolved in excess of $NaOH .$
$(g)$	$[Co (gly)_{3}]$	A complex that contains the anion of amino acid, glycine.
$(h)$	${[Fe {(H_{2} O)}_{5} (SCN)]}^{2 +}$	The red complex ion formed in the qualitative analysis test of ${Fe}^{3 +}$ ion.
$(i)$	$K_{2} [{HgI}_{4}]$	Alkaline solution of this complex is called Nessler's Reagent.
$(j)$	$Co [Hg (SCN)_{4}]$	Deep blue crystalline precipitate obtained in qualitative detection of ${Hg}^{2 +}$
$(k)$	${Fe}_{4} {[Fe (CN)_{6}]}_{3}$	Prussian blue, deep blue coloured complex obtained in detection of ${Fe}^{2 +}$
$(l)$	$K_{3} [Co {({NO}_{2})}_{6}]$	Potassium cobaltinitrite or Fischer salt yellow precipitate obtained in detection of ${Co}^{2 +}$
$(m)$	$[Ni (dmg)_{2}]$	Rosy red precipitate obtained in detection of ${Ni}^{2 +}$ ions.
$(n)$	$K_{2} [{PtCl}_{6}]$	Yellow precipitate obtained in detection of potassium ions.
$(o)$	${Na}_{2} [Fe (CN)_{5} {NO}^{+}]$	Sodium nitroprusside used for detection of sulphide ions/sulphur.
$(p)$	$[Fe {(H_{2} O)}_{5} ({NO}^{+})] {SO}_{4}$	Brown ring complex, obtained in detection of ${Fe}^{+ 1}$ ions.
$(q)$	${[Cu (CN)_{4}]}^{3 -}$	Colourless stable soluble complex obtained in detection of ${Cu}^{2 +}$ on adding excess of $KCN$ solution.
$(r)$	${({NH}_{4})}_{2} [{PtCl}_{6}]$	Only few compounds of ammonium ions are precipitate this is one of these, a yellow precipitate.

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 10

Name the following compounds:

$(a)$ ${[CoBr (en)_{2} (ONO)]}^{+}$

$(b)$ $[Co {({NH}_{3})}_{6}] [Co (ONO)_{6}]$

$(c)$ $[Co {({NH}_{3})}_{5} ({CO}_{3})] Cl$

$(d)$ $[Pt {({NH}_{3})}_{4} {Cl}_{2}] [{PtCl}_{4}]$

$(e)$ ${[Co (en)_{3}]}_{2} {({SO}_{4})}_{3}$

$(f)$ $[{({NH}_{3})}_{5} Co - {NH}_{2} - Co {({NH}_{3})}_{4} (H_{2} O)] {Cl}_{5}$

$(g)$ $[Cr (CO)_{5} ({PPh}_{3})]$

$(h)$ $[(CO)_{5} Mn - Mn (CO)_{5}]$

$(i)$ $Cr {(η^{6} - C_{6} H_{6})}_{2}$

$(j)$ $[Co {({NH}_{3})}_{4} {({OH}_{2})}_{2}] {[{BF}_{4}]}_{3}$

$(k)$ $Ba [Zr (OH)_{2} (ONO)_{2} (Ox)]$

$(l)$ $[Co {({NH}_{3})}_{6}] [Co {(C_{2} O_{4})}_{3}]$

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 11

Write down the formulae of the following compounds

$(a)$	Tetraamminezinc $(II)$ Nitrate	The compound formed when zinc nitrate is treated with an excess of ammonia
$(b)$	Tetracarbonylnickel $(0)$	The first metal carbonyl(prepared in $1888$ ) and an important compound in the industrial refining of nickel metal
$(c)$	Potassium amminetrichloridoplatinate $(II)$	A compound that contains a square planar anion
$(d)$	Dicyanidoaurrate $(I)$ ion	An ion important in the extraction of gold from its ores
$(e)$	Sodium hexafluoridoaluminate $(III)$	Called cryolite, used in the electrolytic refining of aluminium
$(f)$	Diamminesilver $(I)$ ion	lon formed when $AgCl$ is dissolved in excess of ammonia

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 21 - Coordination Compounds>Exercise-1>Q 12

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 $(II)$

MEDIUM

JEE Main/Advance

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

MEDIUM

JEE Main/Advance

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

Write the name of the following ligands and classify their denticity. (a) CH3NC (b) acac-1 (c) N3- (d) dien (e) edta4- (f) dmg-1 (g) NC- (h) NO2- (i) O2- (j) O2-

Important Questions on Coordination Compounds

Learn and Prepare for any exam you want !

Write the name of the following ligands and classify their denticity.

$(a)$ ${CH}_{3} NC$

$(b)$ ${acac}^{- 1}$

$(c)$ $N_{3}^{-}$

$(d)$ $dien$

$(e)$ ${edta}^{4 -}$

$(f)$ ${dmg}^{- 1}$

$(g)$ ${NC}^{-}$

$(h)$ ${NO}_{2}^{-}$

$(i)$ $O^{2 -}$

$(j)$ $O_{2}^{-}$