Statement I: Hybridisation, shape and spin-only magnetic moment of is , octahedral and 4.9 BM respectively. [2023]

Question

Given below are two statements:

Statement I: Hybridisation, shape and spin-only magnetic moment of $K_{3} [Co {({CO}_{3})}_{3}]$ is $s p^{3} d^{2}$ , octahedral and 4.9 BM respectively.

Statement II: Geometry, hybridisation and spin-only magnetic moment values (BM) of the ions ${[Ni {(CN)}_{4}]}^{2 -}, {[{MnBr}_{4}]}^{2 -}$ and ${[{CoF}_{6}]}^{3 -}$ respectively are square planar, tetrahedral, octahedral; $d s p^{2}, s p^{3}, s p^{3} d^{2}$ and 0, 5.9, 4.9.

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

Smart Achievers · Accepted Answer

(1)

$In K_{3} [{Co ({CO}_{3})}_{3}] \Rightarrow s p^{3} d^{2} hybridized, octahedral$
$\Rightarrow 4 unpaired electron$
$\Rightarrow 4.9 B.M.$

${[{Ni (CN)}_{4}]}^{2 -} \Rightarrow d s p^{2} hybridized, square planar$
$\Rightarrow 0 unpaired electron$
$\Rightarrow 0 B.M.$

${[{MnBr}_{4}]}^{2 -} \Rightarrow s p^{3} hybridized, tetrahedral$
$\Rightarrow 5 unpaired electron$
$\Rightarrow 5.9 B.M.$

${[{CoF}_{6}]}^{3 -} \Rightarrow s p^{3} d^{2} hybridized, octahedral$
$\Rightarrow 4 unpaired electron$
$\Rightarrow 4.9 B.M.$

Solution

1 Both Statement I and Statement II are true

2 Statement I is false but Statement II is true

3 Both Statement I and Statement II are false

4 Statement I is true but Statement II is false

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