| (I)\[{{\left[ Cu{{\left( CN \right)}_{4}} \right]}^{3-}}\] |
| (II) \[{{\left[ Co{{\left( N{{H}_{3}} \right)}_{6}} \right]}^{3+}}\] |
| (III) \[{{\left[ Ni{{\left( N{{H}_{3}} \right)}_{6}} \right]}^{2+}}\] |
| (IV) \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}\] |
A) I, III
B) I, II
C) III, IV
D) only IV
Correct Answer: B
Solution :
[b] (I) \[\underset{\left( Diamagnetic \right)}{\mathop{{{[Cu{{(CN)}_{4}}]}^{3}}^{-}}}\,\to \mu =0\] (II) \[\underset{\left( Diamagnetic \right)}{\mathop{{{\left[ Co{{(N{{H}_{3}})}_{6}} \right]}^{3+}}}}\,\to \mu =0\] (III) \[\underset{\left( Paramagnetic \right)}{\mathop{{{\left[ Ni{{\left( N{{H}_{3}} \right)}_{6}} \right]}^{2+}}}}\,\to \mu =\sqrt{8}\,BM\] (IV) \[\underset{\left( Paramagnetic \right)}{\mathop{{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}}}\,\to \mu =\sqrt{3}BM\]
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