સૂચિ $I$ સાથે સૂચિ $II$ ને જોડો.

સૂચિ $I$ સવર્ગ સંકીર્ણ List $II$ અયુગ્મિત ઈલેક્ટ્રોનોની સંખ્યા

$A$ $\left[ Cr ( CN )_6\right]^{3-}$ $I$ $0$

$B$ $\left[ Fe \left( H _2 O \right)_6\right]^{2+}$ $II$ $3$

$C$ $\left[ Co \left( NH _3\right)_6\right]^{3+}$ $III$ $2$

$D$ $\left[ Ni \left( NH _3\right)_6\right]^{2+}$ $IV$ $4$

Question

સૂચિ $I$ સાથે સૂચિ $II$ ને જોડો.

સૂચિ $I$ સવર્ગ સંકીર્ણ	List $II$ અયુગ્મિત ઈલેક્ટ્રોનોની સંખ્યા
$A$ $\left[ Cr ( CN )_6\right]^{3-}$	$I$ $0$
$B$ $\left[ Fe \left( H _2 O \right)_6\right]^{2+}$	$II$ $3$
$C$ $\left[ Co \left( NH _3\right)_6\right]^{3+}$	$III$ $2$
$D$ $\left[ Ni \left( NH _3\right)_6\right]^{2+}$	$IV$ $4$

JEE MAIN 2023, Medium

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Solution

a
For option $(A)$

$Cr ^{+3}: 3 d ^3$

$CN ^{-} \rightarrow SFL$

$\Rightarrow \text { No. of unpaired electrons }=3$

For option $(B)$

$Fe ^{+2}: 3 d ^6$

$H _2 O : WFL$

No. of unpaired electrons $=4$

For option $(C)$

$Co ^{+3}: 3 d ^6$

$NH _3: SFL$

No. of unpaired electrons $=0$

For option $(D)$

$Ni ^{-+2}: 3 d ^8$

$NH _3: SFL$

No. of unpaired electrons $=2$

સૂચિ $- I$	સૂચિ $- II$
$(a)$ $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$	$(i)$ $5.92 \,\mathrm{BM}$
$(b)$ $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$	$(ii)$ $0 \,\mathrm{BM}$
$(c)$ $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}$	$(iii)$ $4.90\, \mathrm{BM}$
$(d)$ $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$	$(iv)$ $1.73\, \mathrm{BM}$

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