1. ⇒ (MHT CET 2023 11th May Morning Shift )

Identify a CORRECT formula for spin only magnetic moment.

A. $μ = (n^{2} + 2) B M$

B. $μ = \sqrt{n^{2} + 2} BM$

C. $μ = \sqrt{n (n + 2)}$ BM

D. $μ = (n + 2)^{2} BM$

Correct Option is (C)

Currently no explanation available

2. ⇒ (MHT CET 2023 10th May Evening Shift )

What is the calculated value of spin only magnetic moment in terms of BM if only one unpaired electron is present in a species?

A. 2.76

B. 2.84

C. 2.2

D. 1.73

Correct Option is (D)

No. of unpaired $e^{-} = 1$

$μ = \sqrt{n (n + 2)} = \sqrt{1 (1 + 2)} = \sqrt{3} = 1.73 BM$

3. ⇒ (MHT CET 2023 10th May Morning Shift )

What is the value of effective atomic number of cobalt in ${[Co {({NH}_{3})}_{6}]}^{3 +}$ complex if $Co (Z = 27)$ ?

A. 30

B. 32

C. 35

D. 36

Correct Option is (D)

${[Co {({NH}_{3})}_{6}]}^{3 +} :$

Oxidation state of cobalt is +3 and six ligands donate 12 electrons.

$\begin{aligned} Z = 27; X = 3; Y = 12 \\ \begin{aligned} EAN of {Co}^{3 +} & = Z - X + Y \\ = 27 - 3 + 12 = 36 \end{aligned} \end{aligned}$

4. ⇒ (MHT CET 2021 21th September Evening Shift )

What is effective atomic number of cobalt in [Co(NH $_{3}$ ) $_{6}$ ] $^{3 +}$ if Co(Z = 27) ?

A. 30

B. 33

C. 27

D. 36

Correct Option is (D)

${[Co {({NH}_{3})}_{6}]}^{3 +} \Rightarrow Z = 27, X = 3, Y = 12$

EAN of ${Co}^{3 +} \Rightarrow Z - X + Y = 27 - 3 + 12 = 36$

⇒Coordination_compound