101. Out of $$TiF_6^{2 - },CoF_6^{3 - },C{u_2}C{l_2}$$ and $$NiCl_4^{2 - }$$ $$\left( {{\text{At}}.\,{\text{no}}{\text{.}}\,\,Z\,\,{\text{of}}\,\,Ti = 22,Co = 27,} \right.$$ $$\left. {Cu = 29,Ni = 28} \right),$$ the colourless species are
A
$$TiF_6^{2 - }\,{\text{and}}\,CoF_6^{3 - }$$
B
$$C{u_2}C{l_2}\,{\text{and}}\,NiCl_4^{2 - }$$
C
$$TiF_6^{2 - }\,{\text{and}}\,C{u_2}C{l_2}$$
D
$$CoF_6^{3 - }\,{\text{and}}\,NiCl_4^{2 - }$$
Answer :
$$TiF_6^{2 - }\,{\text{and}}\,C{u_2}C{l_2}$$
102. $$\left[ {Cr{{\left( {{H_2}O} \right)}_6}} \right]C{l_3}$$ ( at. no. 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
$$3{d_{xy}},3{d_{yz}},3{d_{zx}}$$
B
$$3{d_{xy}},3{d_{yz}},3{d_{{z^2}}}$$
C
$$3{d_{\left( {{x^2} - {y^2}} \right)}},3{d_{{z^2}}},3{d_{xz}}$$
D
$$3{d_{xy}},3{d_{\left( {{x^2} - {y^2}} \right)}},3{d_{yz}}$$
Answer :
$$3{d_{xy}},3{d_{yz}},3{d_{zx}}$$
103. Mark the incorrect match.
A
Insulin - Zinc
B
Haemoglobin - Iron
C
Vitamin $${B_{12}}$$ - Cobalt
D
Chlorophyll - Chromium
Answer :
Chlorophyll - Chromium
104. The terminal and bridged $$CO$$ ligands in the compound $$\left[ {C{o_2}{{\left( {CO} \right)}_8}} \right]$$ are respectively
A
0, 2
B
6, 1
C
5, 2
D
6, 2
Answer :
6, 2
105. Nickel $$(Z = 28)$$ combines with a uninegative monodentate ligand to form a diamagnetic complex $${\left[ {Ni{L_4}} \right]^{2 - }}.$$ The hybridisation involved and the number of unpaired electrons present in the complex are respectively :
A
$$s{p^3},{\text{two}}$$
B
$$ds{p^2},{\text{zero}}$$
C
$$ds{p^2},{\text{one}}$$
D
$$s{p^3},{\text{zero}}$$
Answer :
$$s{p^3},{\text{two}}$$
106. Among $$\left[ {Ni{{\left( {CO} \right)}_4}} \right],{\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }},{\left[ {NiC{l_4}} \right]^{2 - }}$$ species, the hybridisation states of the $$Ni$$ atom are, respectively ( At. no. of $$Ni= 28$$ )
A
$$s{p^3},ds{p^2},ds{p^2}$$
B
$$s{p^3},ds{p^2},s{p^3}$$
C
$$s{p^3},s{p^3},ds{p^2}$$
D
$$ds{p^2},s{p^3},s{p^3}$$
Answer :
$$s{p^3},ds{p^2},s{p^3}$$
107. Which one of the following complexes will have four isomers?
A
$$\left[ {Co{{\left( {en} \right)}_3}} \right]C{l_3}$$
B
$$\left[ {Co{{\left( {PP{h_3}} \right)}_2}{{\left( {N{H_3}} \right)}_2}C{l_2}} \right]$$
C
$$\left[ {Co\left( {en} \right){{\left( {N{H_3}} \right)}_2}C{l_2}} \right]Cl$$
D
$$\left[ {Co{{\left( {en} \right)}_2}C{l_2}} \right]Br$$
Answer :
$$\left[ {Co{{\left( {en} \right)}_2}C{l_2}} \right]Br$$
108. The complex ion which has no $$d$$ - electrons in the central metal atom is
A
$${\left[ {Mn{O_4}} \right]^ - }$$
B
$${\left[ {Co{{\left( {N{H_3}} \right)}_6}} \right]^{3 + }}$$
C
$${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}$$
D
$${\left[ {Cr{{\left( {{H_2}O} \right)}_6}} \right]^{3 + }}$$
Answer :
$${\left[ {Mn{O_4}} \right]^ - }$$
109. Which of the following complexes formed by $$C{u^{2 + }}$$ ions is most stable?
A
$$C{u^{2 + }} + 4N{H_3} \rightleftharpoons {\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }},$$ $$\log \,K = 11.6$$
B
$$C{u^{2 + }} + 4C{N^ - } \rightleftharpoons {\left[ {Cu{{\left( {CN} \right)}_4}} \right]^{2 - }},$$ $$\log \,K = 27.3$$
C
$$C{u^{2 + }} + 2en \rightleftharpoons {\left[ {Cu{{\left( {en} \right)}_2}} \right]^{2 + }},$$ $$\log \,K = 15.4$$
D
$$C{u^{2 + }} + 4{H_2}O \rightleftharpoons {\left[ {Cu{{\left( {{H_2}O} \right)}_4}} \right]^{2 + }},$$ $$\log \,K = 8.9$$
Answer :
$$C{u^{2 + }} + 4C{N^ - } \rightleftharpoons {\left[ {Cu{{\left( {CN} \right)}_4}} \right]^{2 - }},$$ $$\log \,K = 27.3$$
110. The most stable ion is
A
$${\left[ {Fe{{\left( {OH} \right)}_3}} \right]^{3 - }}$$
B
$${\left[ {Fe{{\left( {Cl} \right)}_6}} \right]^{3 - }}$$
C
$${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}$$
D
$${\left[ {Fe{{\left( {{H_2}O} \right)}_6}} \right]^{3 + }}$$
Answer :
$${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}$$