JEE Main 2021 (Online) 24th February Evening Shift | Coordination Compounds Question 208 | Chemistry

The calculated magnetic moments (spin only value) for species $${[FeC{l_4}]^{2 - }}$$, $${[Co{({C_2}{O_4})_3}]^{3 - }}$$ and $$MnO_4^{2 - }$$ respectively are :

5.92, 4.90 and 0 BM

4.90, 0 and 1.73 BM

5.82, 0 and 0 BM

4.90, 0 and 2.83 BM

JEE Main 2020 (Online) 6th September Evening Slot

MCQ (Single Correct Answer)

-1

For a d⁴ metal ion in an octahedral field, the correct electronic configuration is :

$$t_{2g}^4e_g^0$$ when $$\Delta $$₀ < P

$$t_{2g}^3e_g^1$$ when $$\Delta $$₀ > P

$$e_g^2t_{2g}^2$$ when $$\Delta $$₀ < P

$$t_{2g}^3e_g^1$$ when $$\Delta $$₀ < P

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

The species that has a spin-only magnetic moment of 5.9 BM, is :
(T_d = tetrahedral)

[MnBr₄]^2– (T_d)

[NiCl₄]^2– (T_d)

Ni(CO)₄ (T_d)

[Ni(CN)₄]^2– (square planar)

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

-1

Consider the complex ions,
trans-[Co(en)₂Cl₂]⁺ (A) and
cis-[Co(en)₂Cl₂]⁺ (B).
The correct statement regarding them is :

both (A) and (B) can be optically active.

both (A) and (B) can not be optically active.

(A) can not be optically active, but (B) can be optically active.

(A) can be optically active, but (B) can not be optically active.

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