201.
Consider the following reaction and statements:
$${\left[ {Co{{\left( {N{H_3}} \right)}_4}B{r_2}} \right]^ + } + B{r^ - } \to \left[ {Co{{\left( {N{H_3}} \right)}_3}B{r_3}} \right] + N{H_3}$$
(I) Two isomers are produced if the reactant complex ion is a $$cis - $$ isomer.
(II) Two isomers are produced ifthe reactant complex ion is a$$trans - $$ isomer
(III) Only one isomer is produced if the reactant complex ion is a $$trans - $$ isomer
(IV) Only one isomer is produced if the reactant complex ion is a $$cis - $$ isomer.
The correct statements are:
A
(I) and (II)
B
(I) and (III)
C
(III) and (IV)
D
(II) and (IV)
Answer :
(I) and (III)
.PNG "Co-ordination Compounds mcq solution image")
.PNG "Co-ordination Compounds mcq solution image")
202. The spin magnetic moment of cobalt in the compound $$Hg\left[ {Co{{\left( {SCN} \right)}_4}} \right]$$ is
A
$$\sqrt 3 $$
B
$$\sqrt 8 $$
C
$$\sqrt {15} $$
D
$$\sqrt {24} $$
Answer :
$$\sqrt {15} $$
203. Which of the following has an optical isomer
A
$${\left[ {Co\left( {en} \right){{\left( {N{H_3}} \right)}_2}} \right]^{2 + }}$$
B
$${\left[ {Co{{\left( {{H_2}O} \right)}_4}\left( {en} \right)} \right]^{3 + }}$$
C
$${\left[ {Co{{\left( {en} \right)}_2}{{\left( {N{H_3}} \right)}_2}} \right]^{3 + }}$$
D
$${\left[ {Co{{\left( {N{H_3}} \right)}_3}Cl} \right]^ + }$$
Answer :
$${\left[ {Co{{\left( {en} \right)}_2}{{\left( {N{H_3}} \right)}_2}} \right]^{3 + }}$$
204. The coordination number ofa central metal atom in a complex is determined by
A
the number of ligands around a metal ion bonded by sigma and $$pi - {\text{bonds}}$$ both
B
the number of ligands around a metal ion bonded by $$pi - {\text{bonds}}$$
C
the number of ligands around a metal ion bonded by sigma bonds
D
the number of only anionic ligands bonded to the metal ion.
Answer :
the number of ligands around a metal ion bonded by sigma bonds
205. Which one is the most likely structure of $$CrC{l_3}.6{H_2}O$$ if $$\frac{1}{3}$$ of total chlorine of the compound is precipitated by adding $$AgN{O_3}$$
A
$$CrC{l_3}.6{H_2}O$$
B
$$\left[ {Cr{{\left( {{H_2}O} \right)}_3}C{l_3}} \right].{\left( {{H_2}O} \right)_3}$$
C
$$\left[ {CrC{l_2}{{\left( {{H_2}O} \right)}_4}} \right]Cl.2{H_2}O$$
D
$$\left[ {CrCl{{\left( {{H_2}O} \right)}_5}} \right]C{l_2}.{H_2}O$$
Answer :
$$\left[ {CrC{l_2}{{\left( {{H_2}O} \right)}_4}} \right]Cl.2{H_2}O$$
206.
For complex ion/compound formation reactions
$$\left( {\text{i}} \right)C{o^{3 + }}\left( {aq} \right) + EDT{A^{4 - }} \to P$$
$$\left( {{\text{ii}}} \right)N{i^{2 + }}\left( {aq} \right) + dmg{\text{(excess)}}$$ \[\xrightarrow{N{{H}_{4}}OH}Q\]
$$\left( {{\text{iii}}} \right)Z{n^{2 + }}\left( {aq} \right) + gly{\text{(excess)}} \to R$$
$$\left( {{\text{iv}}} \right)P{t^{4 + }}\left( {aq} \right) + en{\text{(excess)}} \to S$$
which of the following complex ion/compound does not exhibit optical activity ?
A
$$P$$
B
$$Q$$
C
$$R$$
D
$$S$$
Answer :
$$Q$$
207.
Which one of the following complexes shows optical isomerism?
$$\left( {en = {\text{ethylenediamine}}} \right)$$
A
$$trans\,\left[ {Co{{\left( {en} \right)}_2}C{l_2}} \right]Cl$$
B
$$\left[ {Co{{\left( {N{H_3}} \right)}_4}C{l_2}} \right]Cl$$
C
$$\left[ {Co{{\left( {N{H_3}} \right)}_3}C{l_3}} \right]$$
D
$$cis\left[ {Co{{\left( {en} \right)}_2}C{l_2}} \right]Cl$$
Answer :
$$\left[ {Co{{\left( {N{H_3}} \right)}_3}C{l_3}} \right]$$
208. $$C{H_3} - Mg - Br$$ is an organo metallic compound due to
A
$$Mg - Br\,{\text{bond}}$$
B
$$C - Mg\,{\text{bond}}$$
C
$$C - Br\,{\text{bond}}$$
D
$$C - H{\text{ bond}}$$
Answer :
$$C - Mg\,{\text{bond}}$$
209.
Match the column I with column II and mark the appropriate choice.
| Column I | Column II | ||
|---|---|---|---|
| a. | $${\left[ {Ag{{\left( {N{H_3}} \right)}_2}} \right]^ + }$$ | 1. | $${d^2}s{p^3},$$ octahedral |
| b. | $${\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$$ | 2. | $$ds{p^2},$$ square planar |
| c. | $$\left[ {Ni{{\left( {CO} \right)}_4}} \right]$$ | 3. | $$sp,$$ linear |
| d. | $${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}$$ | 4. | $$s{p^3},$$ tetrahedral |
A
a - 1, b - 2, c - 3, d - 4
B
a - 3, b - 2, c - 4, d - 1
C
a - 4, b - 3, c - 2, d - 1
D
a - 2, b - 1, c - 3, d - 4
Answer :
a - 3, b - 2, c - 4, d - 1
210. Using valence bond theory, the complex $${\left[ {Cr{{\left( {N{H_3}} \right)}_6}} \right]^{3 + }}$$ can be described as
A
$$s{p^3}{d^2},$$ outer orbital complex, paramagnetic
B
$$ds{p^2},$$ inner orbital complex, diamagnetic
C
$${d^2}s{p^3},$$ inner orbital complex, paramagnetic
D
$${d^2}s{p^3},$$ outer orbital complex, diamagnetic
Answer :
$${d^2}s{p^3},$$ inner orbital complex, paramagnetic
