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1
JEE Main 2021 (Online) 24th February Evening Slot
MCQ (Single Correct Answer)
+4
-1
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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 :
A
5.92, 4.90 and 0 BM
B
4.90, 0 and 1.73 BM
C
5.82, 0 and 0 BM
D
4.90, 0 and 2.83 BM
2
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
For a d4 metal ion in an octahedral field, the correct electronic configuration is :
A
$$t_{2g}^4e_g^0$$ when $$\Delta $$0 < P
B
$$t_{2g}^3e_g^1$$ when $$\Delta $$0 > P
C
$$e_g^2t_{2g}^2$$ when $$\Delta $$0 < P
D
$$t_{2g}^3e_g^1$$ when $$\Delta $$0 < P
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
The species that has a spin-only magnetic moment of 5.9 BM, is :
(Td = tetrahedral)
A
[MnBr4]2– (Td)
B
[NiCl4]2– (Td)
C
Ni(CO)4 (Td)
D
[Ni(CN)4]2– (square planar)
4
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Consider the complex ions,
trans-[Co(en)2Cl2]+ (A) and
cis-[Co(en)2Cl2]+ (B).
The correct statement regarding them is :
A
both (A) and (B) can be optically active.
B
both (A) and (B) can not be optically active.
C
(A) can not be optically active, but (B) can be optically active.
D
(A) can be optically active, but (B) can not be optically active.
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