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1

NEET 2021

MCQ (Single Correct Answer)
Match List-I with List-II :

List-I List-II
(a) $${[Fe{(CN)_6}]^{3 - }}$$ (i) 5.92 BM
(b) $${[Fe{({H_2}O)_6}]^{3 + }}$$ (ii) 0 BM
(c) $${[Fe{(CN)_6}]^{4 - }}$$
(iii) 4.90 BM
(d) $${[Fe{({H_2}O)_6}]^{2 + }}$$
(iv) 1.73 BM


Choose the correct answer from the options given below.
A
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
B
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
C
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
D
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

Explanation

Magnetic moment, $$\mu = \sqrt {n(n + 2)} $$ BM (where n = number of unpaired electrons)

2

NEET 2021

MCQ (Single Correct Answer)
Ethylene diaminetetraacetate (EDTA) ion is :
A
Tridentate ligand with three "N" donor atoms
B
hexadentate ligand with four "O" and two "N" donor atoms
C
Unidentate ligand
D
Bidentate ligand with two "N" donor atoms

Explanation

Ethylene diaminetetraacetate (EDTA) ion is a hexadented ligand having four donor oxygen atoms and two donor nitrogen atoms

3

NEET 2020 Phase 1

MCQ (Single Correct Answer)
Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?
A
SCN$$ - $$ < F$$ - $$ < CN$$ - $$ < C2O42-
B
F$$ - $$ < SCN$$ - $$ < C2O42- < CN$$ - $$
C
CN$$ - $$ < C2O42- SCN$$ - $$ < F$$ - $$
D
SCN$$ - $$ < F$$ - $$ < C2O42- < CN$$ - $$

Explanation

Spectrochemical series (as given in NCERT) :
$${L^ - } < B{r^ - } < SC{N^ - } < C{l^ - } < {S^{ - 2}} < {F^ - } < O{H^ - } < {C_2}{O_4}^{2 - } < {H_2}O < NC{S^ - } < EDT{A^{4 - }} < N{H_3} < en < C{N^ - } < CO$$
4

NEET 2020 Phase 1

MCQ (Single Correct Answer)
The calculated spin only magnetic moment of Cr2+ ion is?
A
4.90 BM
B
5.92 BM
C
2.84 BM
D
3.87 BM

Explanation

Electronic configuration of $$Cr:[Ar]3{d^5}4{s^1}$$

Electronic configuration of $$C{r^{2 + }}$$:[Ar]3d4

No. of unpaired electrons = 4

Spin only magnetic moment = $$\sqrt {n(n + 2)} $$

n = number of unpaired e$$ - $$

Spin only magnetic moment = $$\sqrt {4(4 + 2)} $$

= $$\sqrt {24} $$ BM

= 4.9 BM

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