Coordination CompoundHard

Question

Given below are two statements

Statements-I : The number of paramagnetic species among $\left\lbrack {CoF}_{6} \right\rbrack^{3 -},\left\lbrack {TiF}_{6} \right\rbrack^{3 -},V_{2}O_{5}$ and $\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -}$ is 3 .

Statement-II : $K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack < K_{3}\left\lbrack Fe(CN)_{6} \right\rbrack < \left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack{SO}_{4} \cdot H_{2}O < \left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack{Cl}_{3}$ is the correct order in terms of number of unpaired electron(s) in the complexes.

In the light of the above statements, choose the correct answer from the options given below.

Options

A.Both statement-I and statement-II are true
B.Both statement-I and statement-II are false
C.Statement-I is true but statement-II is false
D.Statement-I is false but statement-II is true

Solution

Paramagnetic species :

$$\left\lbrack {CoF}_{6} \right\rbrack^{3 -},\left\lbrack {TiF}_{6} \right\rbrack^{3 -},\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -} $$Diamagnetic species : $V_{2}O_{5}$

In $K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \Rightarrow$ No. of unpaired electron $= 0$

$K_{3}\left\lbrack Fe(CN)_{6} \right\rbrack \Rightarrow$ No. of unpaired electron $= 1$

$\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack{SO}_{4} \cdot H_{2}O \Rightarrow$ No. of unpaired electron $= 4$

$\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack{Cl}_{3} \Rightarrow$ No. of unpaired electron $= 5$

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