Coordination Compounds Test

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Coordination Compounds Test - 68

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Weekly Quiz Competition

Question 1
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Directions For Questions

The great scientist LAXMI isolated two complexes and in chemical abstract, she reported "A metal complex having composition $$Cr(NH_3)_4Cl_2Br$$ has been isolated in two forms, (A) and (B). The form (A) reacts with $$AgNO_3$$ to give a white precipitate readily soluble in dilute aqueous ammonia, whereas (B) gives a pale yellow precipitate soluble in concentrated ammonia.

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Complexes A and B are respectively.

A
$$[Cr(NH_3)_4Cl_2]Br, [Cr(NH_3)_4Br]Cl_2$$

B
$$[Cr(NH_3)_4Br]Cl_2, [Cr(NH_3)_4Cl_2]Br$$

C
$$[Cr(NH_3)_4ClBr]Cl, [Cr(NH_3)_4Cl_2]Br$$

D
$$[Cr(NH_3)_4Cl_2]Br, [Cr(NH_3)_4ClBr]Cl$$

Solution
Question 2
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Directions For Questions

A, B and C are three complexes of chromium(III) with the empirical formula $$H_{12}O_6Cl_3Cr$$. All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated $$H_2SO_4$$, whereas complex B and C lose $$6.75\%$$ and $$13.5\%$$ of their original weights respectively on treatment with concentrated $$H_2SO_4$$.

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Complex A is?

A
$$[Cr(H_2O)_6]Cl_3$$

B
$$[Cr(H_2O)_5Cl]Cl_2\cdot H_2O$$

C
$$[Cr(H_2O)_4Cl_2]Cl\cdot 2H_2O$$

D
None of these

Solution
Question 3
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The correct order regarding electronegativity of hybrid orbitals of carbon is:

A
$$ sp < sp^2 < sp^3 $$

B
$$ sp < sp^2 >sp^3 $$

C
$$ sp > sp^2 < sp^3 $$

D
$$ sp > sp^2 > sp^3 $$

Solution

Electronegativity increases as s-character in hybrid orbital increases. Percentage of s character in $$ sp,\ sp^2$$ and $$sp^3 $$ are 50%, 33.33% and 25% respectively.

So, the correct option is D.
Question 4
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What is the formula of X if

A
represents $$CrO_{4}^{2-}$$

B
represent $$CrO_{5}$$

C
represent $$Cr_2O_{7}^{2-}$$

D
represents $$CrO_2Cl_2$$

Solution

$$\text{Option D is correct}$$

Here, X represents $$CrO_2Cl_2.$$
Question 5
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A solution containing $$2.675$$g of $$CoCl_3\cdot 6NH_3$$ (molar mass $$=267.5$$ g $$mol^{-1}$$) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of $$AgNO_3$$ to give $$4.78$$g of $$AgCl$$(molar mass$$=143.5$$g $$mol^{-1}$$). The formula of the complex is?

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

B
$$[CoCl_2(NH_3)_4]Cl$$

C
$$[CoCl_3(NH_3)_3]$$

D
$$[CoCl(NH_3)_5]Cl_2$$

Solution

$$AgCl$$ obtained is $$4.78$$g, that is, $$\dfrac{4.78}{143.5}$$ moles.

Thus, in $$\dfrac{2.675}{267.5}=10^{-2}$$ moles of complex, $$\dfrac{4.78}{143.5}\approx \dfrac{1}{30}$$ moles of $$Cl^-$$ ions were isonizable.

That is, in $$10^{-2}$$ moles of complex, $$\dfrac{1}{30}$$ moles $$Cl^-$$ are produced.

$$\therefore 1$$ mole of complex $$\rightarrow \dfrac{1}{30}\times 10^{2}$$ moles of $$Cl^-$$

$$=\dfrac{100}{30}=3.3$$ mols.

Thus, the formula of complex should be $$[Co(NH_3)_6]Cl_3$$.
Question 6
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Complex manure is that which supplies:

A
$$S, K$$ and $$N$$

B
$$N, K$$ and $$P$$

C
$$S$$ and $$N$$

D
$$S, N$$ and $$P$$
Solution
Complex manures is that which supplies N, K and P that is nitrogen, potassium and phosphorus.
Nitrogen is good at making the leaves grow.
Phosphorus improves fruit and/or flower production as well as root growth.
Potassium is great for overall plant health.

Question 7

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Match each coordination compound in List-I with an appropriate pair of characteristics from List-II and select the correct answer using the code given in the lists.

$$\{en =H_2NCH_2CH_2NH_2$$ 'atomic numbers; $$Ti=22; Cr=24; Co=27 Pt=78\}$$

List-I	List-II
(P) $$[Cr(NH_3)_4Cl_2]Cl$$	$$(1)$$ Paramagnetic and exhibits ionization isomerism
(Q) $$[Ti(H_2O)_5Cl](NO_3)_2$$	$$(2)$$ Dimagnetic and exhibits cis-trans isomerism
(R) $$[Pt(en)(NH_3)Cl]NO_3$$	$$(3)$$ Paramagnetic and exhibits cis-trans isomerism
(S) $$[Co(NH_3)_4(NO_3)_2]NO_3$$	$$(4)$$ Dimagnetic and exhibits ionization isomerism

P-$$4$$, Q-$$2$$, R-$$3$$, S-$$1$$

P-$$3$$, Q-$$1$$, R-$$4$$, S-$$2$$

P-$$2$$, Q-$$1$$, R-$$3$$, S-$$4$$

P-$$1$$, Q-$$3$$, R-$$4$$, S-$$2$$

Solution

Question 8
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One mole of the complex compound $$Co(NH_3)_5Cl_3$$ gives $$3$$ moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $$AgNO_3$$ solution to yield two moles of $$AgCl(s)$$. The structure of the complex is?

A
$$[Co(NH_3)_3Cl_3]\cdot 2NH_3$$

B
$$[Co(NH_3)_4Cl_2]\cdot 2NH_3$$

C
$$[Co(NH_3)_4Cl]Cl_2\cdot NH_3$$

D
$$[Co(NH_3)_5Cl] Cl_2$$

Solution

Total $$3$$ moles of ions are generated on dissolution in water, that is, one complex ion and two simple ions.

One mole of complex reacts with two moles of $$AgNO_3$$; thus, it must have $$2$$ Cl atoms bonded by ionic linkage. The coordination number of Co is $$6$$.

$$[Co(NH_3)_5Cl]Cl_2\to [Co(NH_3)_5Cl]^{2+}+2Cl^-$$

$$[Co(NH_3)_5Cl]Cl_2+2AgNO_3\to [Co(NH_3)_5Cl](NO_3)_2+2AgCl(ppt.)$$
Question 9
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Which one of the following has the largest number of isomers?

A
$$[Ir(PR_3)_2H(CO)]^{2+}$$

B
$$[Co(NH_3)_5Cl]^{2+}$$

C
$$[Ru(NH_3)_4Cl_2]^+$$

D
$$[Co(en)_2Cl_2]^+$$ ($$R=$$ alkyl group, $$en=$$ ethylenediamine)
Question 10
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Coordination compounds have great importance in biological systems. In this context, which of the following statements is incorrect?

A
Cyanobalamin is $$B_{12}$$ and contains cobalt.

B
Hemoglobin is the red pigment of blood and contains irons.

C
Chlorophylls are green pigments in plants and contains calcium.

D
Carboxypeptidase-A is an enzyme and contains zinc.

Solution

The correct statement should be chlorophylls are green pigments in plants and contain magnesium.

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Coordination Compounds Test - 68

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Coordination Compounds Test - 68

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Question 1

$$[Cr(NH_3)_4Cl_2]Br, [Cr(NH_3)_4Br]Cl_2$$

$$[Cr(NH_3)_4Br]Cl_2, [Cr(NH_3)_4Cl_2]Br$$

$$[Cr(NH_3)_4ClBr]Cl, [Cr(NH_3)_4Cl_2]Br$$

$$[Cr(NH_3)_4Cl_2]Br, [Cr(NH_3)_4ClBr]Cl$$

Solution

Question 2

$$[Cr(H_2O)_6]Cl_3$$

$$[Cr(H_2O)_5Cl]Cl_2\cdot H_2O$$

$$[Cr(H_2O)_4Cl_2]Cl\cdot 2H_2O$$

None of these

Solution

Question 3

$$ sp < sp^2 < sp^3 $$

$$ sp < sp^2 >sp^3 $$

$$ sp > sp^2 < sp^3 $$

$$ sp > sp^2 > sp^3 $$

Solution

Question 4

represents $$CrO_{4}^{2-}$$

represent $$CrO_{5}$$

represent $$Cr_2O_{7}^{2-}$$

represents $$CrO_2Cl_2$$

Solution

Question 5

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

$$[CoCl_2(NH_3)_4]Cl$$

$$[CoCl_3(NH_3)_3]$$

$$[CoCl(NH_3)_5]Cl_2$$

Solution

Question 6

$$S, K$$ and $$N$$

$$N, K$$ and $$P$$

$$S$$ and $$N$$

$$S, N$$ and $$P$$

Solution

Question 7

P-$$4$$, Q-$$2$$, R-$$3$$, S-$$1$$

P-$$3$$, Q-$$1$$, R-$$4$$, S-$$2$$

P-$$2$$, Q-$$1$$, R-$$3$$, S-$$4$$

P-$$1$$, Q-$$3$$, R-$$4$$, S-$$2$$

Solution

Question 8

$$[Co(NH_3)_3Cl_3]\cdot 2NH_3$$

$$[Co(NH_3)_4Cl_2]\cdot 2NH_3$$

$$[Co(NH_3)_4Cl]Cl_2\cdot NH_3$$

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

Solution

Question 9

$$[Ir(PR_3)_2H(CO)]^{2+}$$

$$[Co(NH_3)_5Cl]^{2+}$$

$$[Ru(NH_3)_4Cl_2]^+$$

$$[Co(en)_2Cl_2]^+$$ ($$R=$$ alkyl group, $$en=$$ ethylenediamine)

Question 10

Cyanobalamin is $$B_{12}$$ and contains cobalt.

Hemoglobin is the red pigment of blood and contains irons.

Chlorophylls are green pigments in plants and contains calcium.

Carboxypeptidase-A is an enzyme and contains zinc.

Solution

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