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IIPUC-INORGANIC CHEMISTRY IMPORTANT QUESTIONS2023
V
...
J
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NARENDRA-9481565750
Chapter-6

General principles and isolation of elements
...
No-6,19 =1+3= 04M
Q
...

Ans:
3
...

Ans:
5
Ans:
6
...

Froth floatation process
...
Why?
Iron scrap is economically feasible and easily available (low cast)
...

Heat
→
Complete the following equation, ZnO + C ⎯⎯⎯
Heat
ZnO + C ⎯⎯⎯
→ Zn + CO

Iron ore contains PbS and ZnS ,sodium cyanide used as an depressant which of these sulphide
comes with the froth
...

Write the principle involved in Zone refining
...

What is the composition of copper matte?

Cu2 S + FeS

8
...
FeO + SiO2 ⎯⎯

9
...


Name the reducing agent used for extraction of iron below 600 ℃
...
CO
...

Sodiumhydroxide
...

Sodiumcyanide
...

What type of ore is concentrated by forth floatation process
...

Mention the role of cresols in the froth floatation method of concentrating sulphide ores?
Cresols and aniline acts as stabilizers
...

Pig iron
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Limestone acts as flux and coke acts as fuel and reducing agent at high temperature
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Nickel
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Zirconoum or titanium
...

Iodine
...

Tin
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Name the metal refined by electrolytic method
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12
Ans:
13
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15
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18
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20
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21
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22
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23
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25
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26
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Ore is a mineral from which metals are extracted economically and conveniently
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What is meant by concentration of ore?
The process of removal of undesired impurities from the ores is called concentration of ore
...

Name the purified by distillation method
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Name the carbonate ore of iron
...
FeCO3

27
Ans:
28

Name flux used to remove iron impurity from molten copper matte
...
(SiO2)
Name the metal extracted by oxidation reduction method
...

Name the metal used for the reduction of gold by cyanide process
...

Name the metal which is most abundant in the earth crust
...

Name the purest form of iron
...
commercial iron
Name the metal extracted by hydrometallurgy
...

Name the metal extracted by electro-metallurgy
...

Mention the principle ore of Aluminium
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Name the metal extracted by pyrometallurgy
...

Name the transition metal present an alloy of Bronze
...
( Bronze alloy of Cu+Tin)
...

Ans:
33
...

Ans:
36
...
No-19 (3 mark)
1
...

Nickel is heated in a stream of carbon monoxideat 330-350K forming volatile complex ,
nickel tetra carbonyl
...

450 k
Step2 :  Ni(CO)4  ⎯⎯⎯
→ Ni + 4CO

2
...

It is useful for removing all the oxygen and nitrogen present in the form of impurity in Zr / Ti
...
Zr + 2I2 ⎯⎯
step2 :It is decomposed on a tungsten filament electrical heated to about 1800K
...

Ans:
4
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ZrI4 ⎯⎯
→ Zr + 2 I2
What is the role of limestone and coke during the extraction of cast iron using blast furnace
...

Coke acts as reducing agent and fuel
...
write chemical equation
...

Ans:

Heat
ZnO + C ⎯⎯⎯
→ Zn + CO
Coke used as reducing agent
...

Gold treated with dilute potassium cyanide in the presence of air form soluble complex
...
4 Au + 8CN − + 2 H 2O + O2 ⎯⎯
When Soluble complex is treated with zinc , zinc replaces gold
...

The process of heating concentrated ore in the presence of air or oxygen below their melting point

→ 2Zn + 3SO2
is called roasting
...

The process of heating concentrated ore in the absence or limited supply of air is called

→ CaO + CO2
calcination
...

Ans:
9
Ans:

Name the products liberated at anode and cathode during electrolysis of brine solution
...

Explain oxidation reduction method for extraction gold/silver by hydrometallurgy
...


→ 2M +  Zn(CN ) 4 
STEP2: 2[ M (CN ) 2 ]− + Zn ⎯⎯

2−

10
Ans:
11
Ans:

Explain Gravity separation process of concentration of ore
...

Mention the two conditions to refine metal by vapour phase refining
...

ii)
Volatile compound decomposed to give metal at high temperature
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No- 19 (3 marks)
1
Ans:

Write the chemical equations involved in the leaching of pure alumina from bauxite ore
...
sodium aluminate is formed leaving impurities
...


2 Na[ Al (OH ) 4 ]( aq ) + CO2( g ) → Al2O3 XH 2O( s ) + 2 NaHCO3( aq )

Step3: The sodium silicate remains in the solution and hydrated alumina is filtered, dried and
heated to get pureAl2O3
...
xH 2O ⎯⎯⎯
→ Al2O3 + XH 2O

2
Ans:

Explain extraction of aluminium by Hall Heroult process:?
Aluminium can be extracted by the electrolysis of alumina by Hall- Heroult process
...
Graphite rod acts as
anode steel tank acts as cathode
...


C + 2O 2− ⎯⎯
→ CO2 + 4e −
Over all reaction : 2 Al2O3 + 3C ⎯⎯
→ 4 Al + 3CO2

3M

3
...


Ans:

2CuFeS2 + O2 ⎯⎯
→ Cu2 S + 2 FeS + SO2

2Cu2 S + 3O2 ⎯⎯
→ 2Cu2O + 2SO2 ,

2 FeS + 3O2 ⎯⎯
→ 2 FeO + 2SO2 ,

FeO + SiO2 ⎯⎯
→ FeSiO3 (slag)

2Cu2O + Cu2 S ⎯⎯
→ 6Cu + SO2
...

Ans:

Explain extraction of copper from low grade copper
...
the solution containing Cu is treated
→ Cu + 2 H +
...
Cu 2+ + H 2 ⎯⎯

ii ) FeO + SiO2 ⎯⎯
→

3M

iii ) Cr2O3 + 2 Al ⎯⎯
→
Ans:

→ 6Cu + SO2
) 2Cu2O + Cu2 S ⎯⎯

,

→ FeSiO3
ii) FeO + SiO2 ⎯⎯

iii ) Cr2O3 + 2 Al ⎯⎯
→ Al2O3 + 2Cr
6
Ans:

Explain extraction of zinc from zinc oxide
...
Concentrated ore is
roasted to form oxide
...

Heat

ZnO + C ⎯⎯⎯
→ Zn + CO
2ZnS + 3O2 ⎯⎯
→ 2Zn + 3SO2 ,

3M

7
...

Combustion zone ( 1800k-2000k) :

3M

C + O2 ⎯⎯
→ CO2 ∆H= - ve , (exothermic reaction)
CO2 + C ⎯⎯
→ 2CO
...


3Fe2O3 + CO ⎯⎯
→ 2 Fe3O4 + CO2 , Fe3O4 + CO ⎯⎯
→ 3FeO + CO2 ,
FeO + CO ⎯⎯
→ Fe + CO2
Carbon monoxide acts as reducing agent,
Slag formation zone ( 1000k- 1300k):
The calcium oxide (flux) combines with acidic silica gangue to form calciumsilicate slag
...
No-7

p-block elements
...
No
...
No-7 (1 mark)
1
Ans:
2
Ans:
3
Ans:
4
Ans:
5
Ans:
6
Ans:
7
Ans:
8
Ans:
9
Ans:

What is the general electronic configuration of noble gases except helium
...

Radon
Name the noble gas element not present in the atmospheric air
...

Atmospheric air
Name the most abundant noble gas in the atmosphere
...

Xenon hexafluoroplatinate(v)
Who prepared the first noble gas compound?
Neil Bartlett
Name the least abundant noble gas present in atmosphere
...

ii) octet(stable)electronic configuration
...
give reason?
Due to stable electronic (ns2 np6) configuration
...

What is the percentage of noble gases in the atmospheric air?
1%
Name the noble gas which has lowest boiling point
...

Complete the following reaction: Ra88

Ans:

He24

15

Complete the following reaction : XeF6 + 3H 2O →
...
+ O2

Ans:

XeF6

17

Complete the following reaction : XeF6 + 2H 2O →
...

Complete the following reaction : Xe + 3F2 ⎯⎯⎯

Ans:

XeF6

19

Complete the following reaction : XeF6 + H 2O →
...


Ans:
21
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22
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23
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24
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27
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29
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31
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32
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33
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34
Ans:
35

XePtF6
How many lone pair of electrons are present in XeF2?
3 lone pair
...

What is the main commercial source for helium?
Natural gas
Why noble gases have high ionization enthalpy?
Due to stable electronic configuration and small size
...
?
Distorted octahedral
What is the structure of XeOF4 and XeO3
Square pyramidal
...

Name the Noble gas element donot have ns2np6 electronic configuration
...

Helium
Name the noble gas that has lowest boiling point and also diffuses through rubber
...

Becuase of its low solubility in blood
...

RnF2
Give an example for krypton compound
...

Neon
Name the noble gas has lowest boiling point
...

Ans:

Q
...
Ra88

2M

2
Ans:

How Xe[PtF6 ] Prepared? Give equation
...


2M

3
Ans:

How is XeOF4 prepared?
Partial hydrolysis of XeF6 gives XeOF4
...


2M

Xe + PtF6 → Xe[ PtF6 ]

XeF6 + H 2O → XeOF4 + 2HF

Ans:
5
Ans:
6

i)
...

Complete the reaction: 6 XeF4 + 12 H 2O → 4 Xe + 2 XeO3 + 24HF +
...
3O2
ii)
...

ii)[XeF3]+[SbF6]-
...
XeF6 + NaF →

2M

2M

2 XeF2 + 2H 2O →
Ans:
7
...

Name the noble gas used in filling i)electric bulbs ii) fluorescent bulbs
...
Electric bulbs- Argon
...
Fluorescent bulbs- Neon (botanical gardens)
On what basis neil Bartlett prepared first noble gas compound?
Platinumhexafluoride oxidizes molecular oxygen to form red compound O2+PtF6
...

Hence plartinum hexafluoride can oxidise xenon to Xe+

2M
2M

Q
...


3M

Pt − Rh /9bar /500 K

Step i) 4 NH3( g ) + 5O2( g ) ⎯⎯⎯⎯⎯⎯
→ 4 NO( g ) + 6H 2 O( g )
Step ii) 2 NO( g ) + O2( g ) → 2 NO2( g )
Step iii) 3NO2( g ) + H 2O(l ) → 2 HNO3( aq ) + NO( g )
...


Ans:

Fe /700 K /20 MPa
i) N2( g ) + 3H 2( g ) ⎯⎯⎯⎯⎯⎯
→ 2 NH3( g ) ∆H= - 46
...


3M

ii) iron oxide as catalyst, Temperature700K, Pressure20MPa
...

iii)
flow chart
...

I) Its small atomic size
ii) High electronegativity
iii)Absence of d orbitals
iv) High ionization enthalpy
...

1
...

2
...

3
...

Give the differences between white phosphorus and red phosphorus

3M

5

3M

Ans:
White phosphorus
1
...
Poisonous

Red phosphorus
1
...

2
...
Soluble in carbon disulphide
4
...

5
...
Insoluble in carbon disulphide
...
It does not glow in dark
5
...


Q
...


Write the chemical equations involved during manufacture of sulphuric acid by
contact process mentioning the reaction conditions
...
S + O2 → SO2,

or

3M

4FeS2 + 11O2 → 2Fe2O3 + 8SO2

Step2
...
6 kj/mol
...


SO3( g ) + H 2 SO4( conc ) → H 2 S2O7( l ) (oleum) ,

H 2 S 2O7( l ) + H 2O → 2 H 2 SO4( l )
...
Complete the following equations:
i) PbS + 4O3( g ) →

ii) NaNO3 + H 2 SO4( conc ) →
iv) 2I − + H 2O + O3 →

iii) SO32− + 2 H + →
Ans:

i) PbS + 4O3( g ) → PbSO4 + 4O2
2−
3

iii) SO

3M

ii) NaNO3 + H 2 SO4( conc ) → HNO3 + NaHSO4
iv) 2 I − + H 2O + O3 → 2OH − + I 2 + O2

+

+ 2 H → SO2 + H 2O

8

i)
...

ii)
...

iii)
...
Give reason
...
Polonium ii) H2S2O7

3M

III)
...


Q
...


Ans;

I) Small atomic size
iii)Absence of vacant d orbitals

10

What is the shape of ClF3 , BrF5 and IF7 molecules?

Ans;

ClF3 - Bent T shaped
...


BrF5 square pyramidal
...


i) 8 NH 3( excess ) + 3Cl2 →

2M

ii) NH 3( g ) + 3Cl2( Excess ) →
Ans:

8 NH

+ 3Cl

→ 6 NH Cl + N 2

ii) NH 3( g ) + 3Cl2( Excess ) → NCl3 + 3HCl

12

3( excess )
2( g )
4
i)
Complete the following equations:
i) Cl2( g ) + 2 NaOH ( cold / dil ) →

Ans:

:I) Cl2( g ) + 2 NaOH ( cold / dil ) → NaCl + NaOCl + H 2 O

ii) 3Cl2( g ) + 6 NaOH ( hot / conc ) →

ii) 3Cl2( g ) + 6 NaOH ( hot / conc ) → 5 NaCl + NaClO3 + 3H 2 O

2M

13

Complete the following equations:
573 K
→
i) Cl2 + 3F2 ⎯⎯⎯
573 K
→ 2ClF3
i) Cl2 + 3F2 ⎯⎯⎯

14

Complete the following equations:
i)HF +H2O→
: i) ClF + H 2O → HF + HOCl

15
Ans:

→
ii) Br2 + 5 F2 ⎯⎯⎯
573 K
→ 2 BrF5
...
Give the equation
...


2M

2M

CuCl2
4 HCl + O2 ⎯⎯⎯
→ 2Cl2 + 2 H 2O

16
Ans:
17
Ans:

What are inter halogen compounds? Give example
...

Ex : ICl ClF3, BrF5 IF7
Write any three anomalous behaviour of fluorine
...
b) fluorine forms only one oxoacid HOF, But other elements form
more oxoacids
...
HF is liquid but other hydrogen halides are gases
...

Q No
...

Q
...
it is used for making bullets
...
Why?
Due to poor shielding effect of 5f orbitals in actinides
...

Promethium
What is the common oxidation state of actinides?
+3
Write the general electronic configuration of actinides?
[Rn] 5f1-14 6d0-1 7s2
What is lanthanide contraction?
The gradual decrease in atomic and ionic radii from lanthanum to lutetium is called
lanthanide contraction
...

[Noblegas] (n-2)f1-14 (n-1)d1-10 ns2
...
What is the action of chromate ion in acidic medium?
2CrO42- + 2H+ ⥨ Cr2O72- + H2O
How does K2Cr2 O7 reacts with KOH(alkali)
K2Cr2 O7+2KOH⥨ 2K2CrO4

2M

3M

12
Ans:
13
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14
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15
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16
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19
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20
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21
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22
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23
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24
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25
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26
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28
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29
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30
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31
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32
Ans:
33

Name the metal which acts as catalyst in hydrogenation of oils
...

Among Sc3+, Zn2+ Co3+ which of the following is coloured?
Co3+
...
why?
Due to absence of unpaired electrons
...
why?
Cobalt salts are coloured due to the presence of unpaired electrons in d orbital
...

Among Cu2+ and Cu+1 which is coloured
...
Since it contains one unpaired electron in 3d orbital
...

Among Cu2+ and Zn2+ which is diamagnetic
...

Name the compound in which manganese shows maximum oxidation state
...
KMnO4
...

Manganese
...

Write the general electronic configuration of d block elements
...
Give reason
...

Write electronic configuration of the 3 d series
...
Give reason
...

Sc3+ salts are diamagnetic
...

Between La(OH)3 and Lu(OH)3 which is more basic?
La(OH)3 is more basic
...
What are transuranium elements?
Elements after uranium are synthetic elements or tansuranium elements
...

What is actinide contraction ?
The gradual decrease in the size of atoms of actinoids across the period is called actinoid
contraction
...
transition elements even though they contain
completely filled orbitals in their ground state?

Ans:
34
Ans:
35
Ans:
36
Ans:
37
Ans:
38
Ans:
39
Ans:
40
Ans:
41
42
Ans:

Since they contain partially filled electrons in their common oxidation state +2
...

Neptunium
Name a 3d series that does not show variable oxidation state
...

Elemets of which groups in the periodic table form the d-block
...

Transition elements exhibits higher enthalpies of atomization
...

Due to in the involvement greater number electrons from (n-1)d in addition to the ns
electrons in the interatomic metallic bonding
...

Transition elements are generally form coloured compounds
...

Due to d-d transition
...

What is the maximum oxidation state shown by uranium?
+6
F- block elements belongs to which group?
Group 3
...

Ti4+ is colourless due to absence of unpaired electrons
...
No-23, 24
1
Ans:

(3 MARKS QUESTIONS)

Write the equations involved in the manufacture of potassium dichromate fro
chromite ore
...
Chromite ore is heated with sodiumcarbonate in excess of air to form sodium
chromate
...
Yellow coloured solution of sodium chromate filtered and treated with conc
sulphuric acid to give sodium dichromate
...
Sodium dichromate treated with potassium chloride to form potassium
dichromate
...
(J-16,M-17)
Pyrolusite heated with alkali in the presence of oxidizing agent KNO3 form potassium
manganate
...


2MnO2 + 4 KOH + O2 → 2 K 2 MnO4 + 2 H 2O

3MnO42− + 4 H + → 2MnO4− + MnO2 + 2 H 2O
3
Ans:

3M


...


Transition elements are good catalysts
...

ii)Large surface area for adsorption
iii)Presence of partially filled d orbitals
...
)
Fe
→ 2 NH 3
...
N 2 + 3H 2 ⎯⎯
ii)H ydrogenation of oil nickel acts as catalyst
...

iii)Reaction between persulphate and iodide S 2O82− + 2 I − ⎯⎯⎯

3M

Explanation: 2 Fe3+ + 2 I − → 2 Fe 2+ + I 2 ,

2 Fe2+ + S2O82− → 2 Fe3+ + 2SO42−
4
Ans:

5
Ans:

6
Ans:

7
Ans:

What are interstitial compounds ?Mention its properties
...

Ex
...
VH0
...

i) They have high melting points
...

iii)They are chemically inert
iv)They retain metallic conductivity
...

Consequences:
1
...
It is difficult to separate lanthanides
...
Basicity decreases La to Lu
...

Lanthanides
Actinidses
1
...

1
...

2
...
All are radioactive
3
...

3
...

4
...

4
...


3M

Calculate the magnetic moment of the following : 1
...
Sc3+

1
...


 = 5(5 + 2) =5
...


2
...
Fe2+ [ Ar ]3d 6 4S 0

 = n(n + 2)

 = 4(4 + 2) =4
...
Fe2+
...

ii Zero spin only magnetic moment in its +2 oxidation state
...

i) Manganese
ii) Zinc
...

2−
−
Among MnO4 and MnO4 which is diamagnetic ? Why?

Ans:

MnO42− is diamagnetic due to paired electrons and is green
...

How dichromate ion reacts in alkaline medium and acidic medium
...


Why transition elements form coloured compounds?
Colour of transition elements due to d-d transitions
...

ii)Oxidation state of the metal ion
...

iii)High polarizing power
...

4−
[ PtCl4 ]2 − ,
[Cu ( NH 3 ) 4 ]2+
Ex
...

Magnetic properties of transition elements due to
i)Orbital motion of electrons
...

1
...
Ex
...
Etc
2
...
Ex
...

3
...
Ex
...

Explain why Cu+ ion is not stable in aqueous solution
...


+
( aq )

2Cu

2+
( aq )

→ Cu

3M

1M

+ Cu( s )
...
Oxidation state of metals increases upto middle then decreases
...
No-9

Coordination compounds
...
No-25,26-- (3 MARKS QUESTIONS)
1
Ans:
2
Ans:
3
Ans:
4
Ans:
5
Ans:

ANS:
6
...

Hybridisation; d2sp3 Geometry-octahedral
...
Low spin
complex
...

Hybridisation: dsp2
...
magnetic property- diamagnetic
...

Using valence bond theory account for hybridization ,geometry and magnetic
behaviour of [CoF6]3-
...
Geometry-octahedral
...
It is high
spin outer orbital complex
...

Hybridisation-sp3, Geometry –Tetrahedral
...

a)What is linkage isomerism ? Give an example
...

Ex
...


1M

i
...

ii
...


3M

3M

3M

2M

3M

iii
...

iv
...

v
...

7
Ans:

a) Mention any three limitations of valence bond theory
...
What is ionization isomerism? Give an example
...
Ex
...


2m

b) How many chloride ions satisfy only primary valency in the following complex
[Co(NH3)5Cl]Cl2
...
What is coordinate isomerism ? give an example
...

Ex
...


1M

b) How many chloride ions satisfy both primary and secondary valency in the following
complex [Co(NH3)5Cl]Cl2
...

a)
...


1m

Ans:
9
Ans:

Ans:
10
Ans:
11
Ans:
12

Ans:
13
Ans:

Ans:
14
Ans:

I)
II)
Iii)
Iv)

3M

It involves number of assumptions
...

It does not explain colour exhibited by coordination compounds
...


t2g has lower energy
...

b) What is the coordination number of Fe in [ FeCl2 (en)2 ]Cl ?
6 or six
...

iii) What is the magnetic behaviour
...

i) +3
ii) Octahedral
iii) Paramagnetic
...

a
...


2m

Complexes having the same molecular formula but number of water molecules acts as
ligands are different
...
[Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2
...

b
...

a
...
Pairing energy
...
Crystal field splitting
...
The energy required for electron pairing in a single orbital is called pairing energy
...
The process of splitting of d orbitals into t2 g andeg set of orbitals in the presence of ligands

2m

is called crystal field splitting
...
Out of the following two complexes which is optically active?
(chiral)(i) Cis- [CrCl2 (ox) 2 ]3−
(ii)trans- [CrCl2 (ox) 2 ]3−

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