Coordination Compounds Test

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Coordination Compounds Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following high spin complexes has the largest $$CFSE$$ (crystal field stabilization energy)?

A
$$[Cr(H_{2}O_{6})]^{2+}$$

B
$$[Cr(H_{2}O)_{6}]^{3+}$$

C
$$[Mn(H_{2}O)_{6}]^{2+}$$

D
$$[Mn(H_{2}O)_{6}]^{3+}$$
Question 2
1 / -0

The most stable complex among the following is:

A
$$[Pd(CN)_4]^{4-}$$

B
$$[Fe(CO)_5]$$

C
$$[Ni(CN)_4]^{4-}$$

D
$$[Ni(CN)_4]^{3-}$$

Solution
Question 3
1 / -0

Which of the following has longest C-O bond length? (Free C-O bond length CO is $$1.128\overset{o}{A}$$).

A
$$[Mn(CO)_6]^+$$

B
$$[Ni(CO)_4]$$

C
$$[Co(CO)_4]^{\circleddash}$$

D
$$[Fe(CO)_4]^{2-}$$
Question 4
1 / -0

$$ [Cr(H_{2}O)_{6}]Cl_{3}$$ (atomic number of Cr =24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d -electrons in the chromium present in the complex is:

A
$$ 3d^{1}_{xy},3d^{1}_{yz},3d^{1}_{zx}$$

B
$$3d^{1}_{xy},3d^{1}_{yz},3d^{1}_{z^{2}}$$

C
$$ 3d^{1}_{x^{2}-y^{2}},3d^{1}_{z^{2}},3d^{1}_{zx}$$

D
$$ 3d^{1}_{xy},3d^{1}_({x^{2}-y^{2}}),3d^{1}_{xz}$$

Solution
Question 5
1 / -0

Which of the following complexes is/are expected to exhibit isomerism?

A
$$[Pt(NH_{3})_{2}Cl_{2}]$$

B
$$[Ni(NH_{3})_{2}Cl_{2}]$$

C
$$[Ni(en)_{3}]^{2+}$$

D
$$[Ni(NH_{3})_{4}(H_{2}O)_{2}]^{2+}$$
Question 6
1 / -0

The metal d-orbitals that are directly facing the ligands in $$K_{3}[Co(CN)_{6}]$$ are:

A
$$d_{xz}, d_{yz}$$ and $$d_{z^{2}}$$

B
$$d_{xy}, d_{xz}$$ and $$d_{yz}$$

C
$$d_{xy}$$ and $$d_{x^{2} - y^{2}}$$

D
$$d_{x^{2} - y^{2}}$$ and $$d_{z^{2}}$$

Solution

$$K_{3}[Co(CN)_{6}]$$

$$Co^{3+} \rightarrow [Ar]_{18}3d^{6}$$.
Here since the coordination number of $$Co$$ is 6, thus it will form an octahedral complex.

Thus, according to CFT, the orbitals which are in the direction of metal is $$d_{x^2-y^2}$$ and $$d_{z^2}$$.
Question 7
1 / -0

The total number of possible isomer for the complex complex:-$$[Cu(NH_{3})_{4}][PtCl_{4}]$$

A
3

B
6

C
5

D
4
Question 8
1 / -0

The number of isomers of $$ [Co(NH_3)_3Cl_3] $$ complex and the secondary valency of the metal ion in the complex, respectively, are:

A
$$3$$ & $$3$$

B
$$2$$ & $$3$$

C
$$2$$ & $$6$$

D
$$3$$ & $$6$$

Solution
Question 9
1 / -0

The magnitude of crystal field stabilization energy $$(CFSE\ or\ \Delta_{t})$$ in tetrahedral complexes is considerably less than in the octahedral field because:

A
there are only four ligands instead of six.

B
the direction of the orbitals does not coincide with the direction of the ligands.

C
Both points $$(A)$$ and $$(B)$$ are correct

D
Both points $$(A)$$ and $$(B)$$ are wrong.
Question 10
1 / -0

The number of ions produced by potassium ferric cyanide in solution is:

A
2

B
3

C
4

D
5

Solution