Given below are two statements: Statement I: Among 3]2+, [Ni(NH3)6]2+ and [Mn(H2O)6]2+, [Mn(H2O)6]2+ has the maximum number of unpaired electrons. Statement II: The number of pairs a

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Solution

Q.
Given below are two statements:

Statement I: Among ${[Cu {({NH}_{3})}_{4}]}^{2 +}, {[Ni {(en)}_{3}]}^{2 +}$ , ${[Ni {({NH}_{3})}_{6}]}^{2 +}$ and ${[Mn {(H_{2} O)}_{6}]}^{2 +}$ , ${[Mn {(H_{2} O)}_{6}]}^{2 +}$ has the maximum number of unpaired electrons.

Statement II: The number of pairs among ${{[{NiCl}_{4}]}^{2 -}, {[Ni {(CO)}_{4}]}, {{[{NiCl}_{4}]}^{2 -}, [{Ni(CN)}_{4}]}^{2 -}}$ and ${[Ni {(CO)}_{4}], {[Ni {(CN)}_{4}]}^{2 -}}$ that contain only diamagnetic species is two.

In the light of the above statements, choose the correct answer from the options given below: [2026]

1 Statement I is true but Statement II is false

2 Both Statement I and Statement II are false

3 Both Statement I and Statement II are true

4 Statement I is false but Statement II is true

Ans.
(1)

${[Cu {({NH}_{3})}_{4}]}^{2 +} \Rightarrow d^{9}, d s p^{2} one unpaired electron$

${[Ni {(en)}_{3}]}^{2 +} \Rightarrow d^{8}, s p^{3} d^{2} two unpaired electrons$

${[Ni {({NH}_{3})}_{6}]}^{2 +} \Rightarrow d^{8}, s p^{3} d^{2} two unpaired electrons$

${[Mn {(H_{2} O)}_{6}]}^{2 +} \Rightarrow d^{5}, s p^{3} d^{2} five unpaired electrons$

$[Ni {(CO)}_{4}] (diamagnetic)$

${[{NiCl}_{4}]}^{2 -} (paramagnetic)$

${[Ni {(CN)}_{4}]}^{2 -} (diamagnetic)$

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