Coordination Compounds Test

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Coordination Compounds Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

The number of unpaired electron in complex $$[Cr(NO_{2})_{3}(NH_{3})_{3}]$$ is

A
2

B
3

C
1

D
0

Solution
Question 2
1 / -0

Nickel $$(Z=28)$$ combines with a uni negative monodentate ligand $$X^{-}$$ to form a paramagnetic complex, $$[NiX_{4}]^{2-}$$. The number of unpaired electrons in the nickel and geometry of this complexion are, respectively:

A
One, tetrahedral

B
Two, tetrahedral

C
One, square planar

D
None of these
Question 3
1 / -0

which has the maximum conductivity in thier 0.1M solution?

A
A) $$\left[ Co{ (NH }_{ 3 })_{ 3 }{ Cl }_{ 3 } \right] $$

B
B) $$\left[ Co({ NH }_{ 3 })_{ 4 }Cl \right] { Cl }_{ 2 }$$

C
C) $$\left[ Co({ NH }_{ 3 })_{ 5 }Cl \right] { Cl }_{ 2 }$$

D
D) $$\left[ Co({ NH }_{ 3 })_{ 6 } \right] { Cl }_{ 3 }$$

Solution

The maximum conductivity is shown by that compound which have maximum ions on dissociation. Hence the compound $$[Co(NH_3)_6]Cl_3$$ have the maximum number of ions $$[Co(NH_3)_6] + 3Cl^-$$ = 4 ions and hence the correct answer is D.
Question 4
1 / -0

In $$[Co(NH_3)_6]Cl_3$$, the number of covalent bonds is

A
3

B
6

C
9

D
18

Solution
Question 5
1 / -0

Total number of possible isomers of $$\left[ Cu({ NH }_{ 3 })_{ 4 } \right] \left[ { PtCl }_{ 4 } \right]$$ is:

A
3

B
4

C
5

D
6

Solution

The total number of possible isomer of the $$[Cu(NH_3)_4] [PtCl_4]$$ is 4.

The isomers can be formed by exchanging the ligands.

1.$$[Cu(NH_3)_3Cl] [Pt(Cl)_3NH_3]$$

2.$$[Cu(NH_3)_2Cl_2] [PtCl_2(NH_3)_2]$$

3.$$[Cu(NH_3)Cl_3] [PtCl(NH_3)_3]$$

4. $$[CuCl_4] [Pt(NH_3)_4]$$

Hence, the correct option is B
Question 6
1 / -0

Given the molecular formula of the hexa coordinated complexes (A) $${ CoCl }_{ 3 }.{ 6NH }_{ 3 }$$ (B) $${ CoCl }_{ 3 }.{ 5NH }_{ 3 }$$ (C) $${ CoCl }_{ 3 }.{ 4NH }_{ 3 }$$. If the number of coordinated $${ NH }_{ 3 }$$ molecules in $$A, B$$ and $$C$$ respectively are $$6, 5$$ and $$4$$, primary valency in $$(A), (B)$$ and $$(C)$$ are

A
$$0, 1, 2$$

B
$$3, 2, 1$$

C
$$6, 5, 4$$

D
$$3, 3, 3$$

Solution

The complex can be written as follows.

$$A-[Co(NH_3)_6]Cl_3$$

$$B- [Co(NH_3)_5Cl]Cl_2 $$

$$C-[Co(NH_3)_4 Cl_4]Cl$$

Hence, number of primary valency are $$3,2$$ and $$1$$ respectively.
Question 7
1 / -0

$$LiH + \underline {B}_2H_6 \rightarrow 2Li \underline{B}H_4$$

Find the change in hybridization of the underlined atom.

A
$$sp^2 \rightarrow sp^3$$

B
$$sp^3 \rightarrow sp^2$$

C
$$sp \rightarrow sp^3$$

D
None
Question 8
1 / -0

The complex ion having minimum wavelength of absorption in the visible region is:

A
$$[Co(NH_3)_6]^{3+}$$

B
$$[CoCl(NH_3)_5]^{2+}$$

C
$$ Cis-[CoCl_2(NH_3)_4]^{+}$$

D
$$Trans-[CoCl_2(NH_3)_4]^{+}$$
Question 9
1 / -0

Which isomer of $$CrCl_{3} . 6H_{2}O$$ is dark green in colour and forms one mole of $$AgCl$$ with excess of $$AgNO_{3}$$ solution ?

A
$$[Cr(H_{2}O)_{6}]Cl_{3}$$

B
$$[Cr(H_{2}O)_{5}Cl] Cl_{2} . H_{2}O$$

C
$$[Cr(H_{2}O)_{4}Cl_{2}] Cl . 2H_{2}O$$

D
$$[Cr(H_{2}O)_{3}Cl_{3}]3H_{2}O$$
Question 10
1 / -0

For the following two complexes
$$A:[NiCl_6]^{4-}$$ and $$[NiCl_4]^{2-}$$ the ratio of CFSE will be nearly:

A
$$\dfrac{3}{2}$$

B
$$\dfrac{4}{9}$$

C
$$\dfrac{9}{4}$$

D
$$\dfrac{27}{8}$$

Solution

$$[NiCl_6]^{4-} \rightarrow$$ octahedral complex ($$t_{2g}= 6, e_{g}= 4$$)

$$[NiCl_4]^{2-} \rightarrow $$Tetrahedral complex ($$e_g= 4, t_{2g}= 4$$)

for octahedral CFSE =$$-0.4 \times 6+0.6\times 2=-1.2$$

for tetradidral CFSE$$= +0.4\times 4-0.6\times 4=-0.8$$

$$\therefore \dfrac{CFSE(1)}{CFSE(2)}=\dfrac{-1.2}{-0.8}=\dfrac{3}{2}$$

Option A is correct.

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Coordination Compounds Test - 57

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Coordination Compounds Test - 57

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Question 1

2

3

1

0

Solution

Question 2

One, tetrahedral

Two, tetrahedral

One, square planar

None of these

Question 3

A) $$\left[ Co{ (NH }_{ 3 })_{ 3 }{ Cl }_{ 3 } \right] $$

B) $$\left[ Co({ NH }_{ 3 })_{ 4 }Cl \right] { Cl }_{ 2 }$$

C) $$\left[ Co({ NH }_{ 3 })_{ 5 }Cl \right] { Cl }_{ 2 }$$

D) $$\left[ Co({ NH }_{ 3 })_{ 6 } \right] { Cl }_{ 3 }$$

Solution

Question 4

3

6

9

18

Solution

Question 5

3

4

5

6

Solution

Question 6

$$0, 1, 2$$

$$3, 2, 1$$

$$6, 5, 4$$

$$3, 3, 3$$

Solution

Question 7

$$sp^2 \rightarrow sp^3$$

$$sp^3 \rightarrow sp^2$$

$$sp \rightarrow sp^3$$

None

Question 8

$$[Co(NH_3)_6]^{3+}$$

$$[CoCl(NH_3)_5]^{2+}$$

$$ Cis-[CoCl_2(NH_3)_4]^{+}$$

$$Trans-[CoCl_2(NH_3)_4]^{+}$$

Question 9

$$[Cr(H_{2}O)_{6}]Cl_{3}$$

$$[Cr(H_{2}O)_{5}Cl] Cl_{2} . H_{2}O$$

$$[Cr(H_{2}O)_{4}Cl_{2}] Cl . 2H_{2}O$$

$$[Cr(H_{2}O)_{3}Cl_{3}]3H_{2}O$$

Question 10

$$\dfrac{3}{2}$$

$$\dfrac{4}{9}$$

$$\dfrac{9}{4}$$

$$\dfrac{27}{8}$$

Solution

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