Coordination Compounds Test

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Coordination Compounds Test - 7

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Weekly Quiz Competition

Question 1
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One or More than One Options Correct Type

Direction (Q. Nos. 1-5) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q.

An example of double salt is/a

A
hypo

B
common alum

C
carnallite

D
Option B,C are Correct

Solution

Common alum is K₂ SO₄ .AI₂ (SO₄ )₃ .24H₂ O and carnallite is KCl.MgCl₂ .6H₂ O.
Question 2
1 / -0.25

Type of bonding in K₄ [Fe(CN)₆ ] is/a

A
ionic

B
covalent

C
coordinate covalent

D
All are correct

Solution

The complex K₄ [Fe(CN)₆ ] whose formula can be written like that of double salt. Fe(CN)₂ . 4KCN, dissociates to give K⁺ and [Fe(CN)₆ ]^4- ions in the aqueous solution.
Question 3
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The effective atomic number of Fe in Fe(CO)₅ is

A
36

B
24

C
34

D
26

Solution

The answer is 36 because in coordination compound we use EAN method due to which inert group atomic number or noble gas atomic number is more stable.
Question 4
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Which of the following statements is/are correct?

A
[Co(en)₂ NO₂ Cl] Br is cationic complex

B
[Fe(CO)₅ ] is neutral complex

C
[Cu(NH₃ )₄ ]SO₄ is deep blue colour

D
All are correct
Solution
[Co(en)₃ ]CI₃ produces 4 ions in solution as follows :
[Co(en)₃ ] CI₃ →[Co(en)₃ ]³⁺ + 3CI^-

is correct as charge on the complex ion will be +1

is incorrect as the complex will form 4 ions in solution

is correct as there is no charge on the complex

is also correct as cu+2 has blue color in solution

Hence A, B and C are correct.
Question 5
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A freshly prepared aqueous solution of Pd(NH₃ )₂ CI₂ does not conduct electricity, it suggests that

A
the structure of the compound involves covalent bonding only

B
the chlorine atoms must be in coordination sphere

C
the van 't Hoff factor of the compound would be unity

D
Option B,C are Correct

Solution

In the aqueous solution of Pd(NH₃ )₂ CI₂ , the atoms of chlorine I are in coordination sphere and the van 't Hoff factor of the ] compound are unite.
Question 6
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Comprehension Type

Direction : This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Complex compounds are addition compounds formed by the stoichiometric combination of two or more simple salts but do not decompose into constituent ions completely. The first such complex prepared by Tassaert is hexamine cobalt (III) chloride. Later many such compounds were prepared and their properties were studied. The chloramines complexes of cobalt (III) chromium (III) not only exhibit a spectrum of colours but also differ in the reactivity of their chlorides. Moreover, greater the number of ions produced by a complex in solution, greater is the electrical conductivity. This type of information was obtained for several series of complexes.

Q.

Coordination number of Co in CoCl₃ . 5H₂ O is six. The volume of 0.1 N AgNO₃ needed to precipitate the chlorine in 200 mL of 0.01 M solution of complex is

A
140 mL

B
40 mL

C
80 mL

D
20 mL

Solution

Since, the oxidation number of Co is + 3 hence, the complex compound would be [CoCI . 5H₂ O]CI₂ .

Hence, 1 mole of [CoCI . 5H₂ O]CI₂ gives 2 moles of Cl^- ion.
Given, moles of [CoCI . 5H₂ O]CI₂ = 200 mL x 0.01 M = 2 millimol
2 millimol of [CoCI . 5H₂ O]CI₂ will give 4 millimol of Cl^- .

Now, to neutralise 4 millimol of Cl^- , 4 millimol of AgNO₃ is required.
Let the volume o! AgNO₃ = VmL
Millimoles of AgNO₃ = 0.1 x V
0.1 x V = 4 millimol
Question 7
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Complex compounds are addition compounds formed by the stoichiometric combination of two or more simple salts but do not decompose into constituent ions completely. The first such complex prepared by Tassaert is hexamine cobalt (III) chloride. Later many such compounds were prepared and their properties were studied. The chloramines complexes of cobalt (III) chromium (III) not only exhibit a spectrum of colours but also differ in the reactivity of their chlorides. Moreover, greater the number of ions produced by a complex in solution, greater is the electrical conductivity. This type of information was obtained for several series of complexes.

Q.

The number of ions per mole of the complex CoCI₃ . 5NH₃ in aqueous solution will be

A
3

B
9

C
2

D
4

Solution

[Co(NH₃ )₅ CI]CI₂ →[Co(NH₃ )5CI]²⁺ + 2Cl^-
Hence, 3 ions are present for one mole of the complex in the solution.
Question 8
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Matching List Type

Direction : Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q.

'Match the Column I with Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution

(i) →(r), (ii) →(q), (iii) →(p), (iv) →(s)
Question 9
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One Integer Value Correct Type

Direction : This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q.

Formula of Mohr ’s salt is FeSO₄ . (NH₄ )₂ SO₄ . xH₂ O. Here x value is

A
6

B
5

C
1

D
0

Solution

Formula of Mohr ’s salt is FeSO₄ . (NH₄ )₂ SO₄ . 6H₂ O . Here, x is 6
Question 10
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When AgNO₃ solution is added in excess to 1 M solution of CoCI₃ . xNH₃ , one mole of AgCI is formed. The value of x is

A
1

B
2

C
3

D
4

Solution

AgNO₃ solution is added in excess of 1 M solution of CoCI₃ . xNH₃ .
CoCl₃ .xNH₃ +AgNO₃ →AgCl (1mole)

This precipitation of 1 mol of AgCl by this reaction shows that there is only one Cl outside the coordination sphere, which is not as a ligand ( as ligands are not ionisable).

Hence, the compound must be as follows:(showing the coordination sphere) [Co(NH₃ )₄ Cl₂ ]Cl, as this is the octahedral complex, where it is clear that there are only 2 Cl as ligand and other ligands are NH₃ .

So, 6 −2 = 4 NH₃ ligands.
Question 11
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The volume (in mL) of 0.1 M AgNO₃ required for complex precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H₂ O)₅ Cl]Cl₂ , as silver chloride is close to

A
3

B
4

C
5

D
6

Solution

The correct answer is Option D
Number of ionisable Cl −in [Cr(H₂ O)₅ Cl]Cl₂ is 2.
∴Millimoles of Cl −=30 ×0.01 ×2=0.6
∴Millimoles of Ag+ required =0.6
Now, 0.6/V(in ml) = 0.1
or, V=6 ml.
Question 12
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Oxidation state of cobalt in Co(CO)₆ is

A
0

B
1

C
5

D
4

Solution

ln Co(CO)₆
Let the oxidation state of Co is x.
x + 6 x 0 = 0
[Carbonyl (CO) is a neutral ligand hence, zero charg]
x = 0
Hence, Co has zero oxidation state.
Question 13
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In the complex PtCl₄ . 5NH₃ if coordination number of platinum is 6, number of chloride ions precipitated by adding AgNO₃ are

A
1

B
3

C
4

D
0

Solution

Coordination number of platinum is 6.
∴Number of chloride ions precipitated by adding AgCI are 3.
Question 14
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Statement Type

Direction : This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q.

Statement I : Oxidation state of Fe in Fe(CO)₅ is zero.
Statement II : EAN of Fe in this complex is 36.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Statement I is true because CO is a neutral ligand, Statement II is true because
EAN of Fe
= Atomic number of Fe + Electrons gained by coordination
= 26 + 2 x 5 = 36
But Statement II is not the correct explanation. Correct explanation is that oxidation state of Fe in Fe(CO)₅ is zero because CO is a neutral ligand.
Question 15
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Statement I : The oxidation num ber of platinum in Zeise ’s salt is +4.

Statement II : Zeise ’s salt is ionic complex.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Statement I The oxidation number of Pt in Zeis e ’s salt is +2.
Statement II Zeise ’s salt is ionic complex with the formula K[PtCl₃ (C ₂ H₄ )].
Hence, statement II is correct but statment I is incorrect.

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Coordination Compounds Test - 7

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Coordination Compounds Test - 7

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Question 1

hypo

common alum

carnallite

Option B,C are Correct

Solution

Question 2

ionic

covalent

coordinate covalent

All are correct

Solution

Question 3

36

24

34

26

Solution

Question 4

[Co(en)2 NO2 Cl] Br is cationic complex

[Fe(CO)5 ] is neutral complex

[Cu(NH3 )4 ]SO4 is deep blue colour

All are correct

Solution

Question 5

the structure of the compound involves covalent bonding only

the chlorine atoms must be in coordination sphere

the van 't Hoff factor of the compound would be unity

Option B,C are Correct

Solution

Question 6

140 mL

40 mL

80 mL

20 mL

Solution

Question 7

3

9

2

4

Solution

Question 8

a

b

c

d

Solution

Question 9

6

5

1

0

Solution

Question 10

1

2

3

4

Solution

Question 11

3

4

5

6

Solution

Question 12

0

1

5

4

Solution

[Co(en)₂ NO₂ Cl] Br is cationic complex

[Fe(CO)₅ ] is neutral complex

[Cu(NH₃ )₄ ]SO₄ is deep blue colour