1
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The primary and secondary valencies of cobalt respectively in $$\mathrm{[Co(NH_3)_5Cl]Cl_2}$$ are :

A
2 and 8
B
2 and 6
C
3 and 5
D
3 and 6
2
JEE Main 2022 (Online) 29th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Octahedral complexes of copper(II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum structural distortion? (en - ethylenediamine; $$\mathrm{H}_{2} \mathrm{~N}_{-} \mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{NH}_{2}$$)

A
$$\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{SO}_{4}$$
B
$$\left[\mathrm{Cu}(\mathrm{en})\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right] \mathrm{SO}_{4}$$
C
cis-$$\left[\mathrm{Cu}\left(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]\right.$$
D
trans-$$\left[\mathrm{Cu}\left(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]\right.$$
3
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List - I (Complex) List - II (Hybridization)
(A) $$Ni{(CO)_4}$$ (I) $$s{p^3}$$
(B) $${[Ni{(CN)_4}]^{2 - }}$$ (II) $$s{p^3}{d^2}$$
(C) $${[Co{(CN)_6}]^{3 - }}$$ (III) $${d^2}s{p^3}$$
(D) $${[Co{F_6}]^{3 - }}$$ (IV) $$ds{p^2}$$

Choose the correct answer from the options given below :

A
A-IV, B-I, C-III, D-II
B
A-I, B-IV, C-III, D-II
C
A-I, B-IV, C-II, D-III
D
A-IV, B-I, C-II, D-III
4
JEE Main 2022 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Low oxidation state of metals in their complexes are common when ligands :

A
have good $$\pi$$-accepting character
B
have good $$\sigma$$-donor character
C
are having good $$\pi$$-donating ability
D
are having poor $$\sigma$$-donating ability
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