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Class 12 NEET Chemistry D And F Block Elements Questions
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© examsnet.com
Question : 67
Total: 108
The aqueous solution containing which one of the following ions will be colourless? (Atomic number :
Sc
=
21
,
Fe
=
26
Ti
=
22
,
Mn
=
25
)
(2005)
Sc
3
+
Fe
2
+
Ti
3
+
Mn
2
+
Validate
Solution:
If the transition metal ion has unpaired electron then it shows colour.
Sc
3
+
:
[
Ar
]
3
d
0
4
s
0
Fe
2
+
:
[
Ar
]
3
d
5
4
s
1
Ti
3
+
:
[
Ar
]
3
d
1
4
s
0
Mn
2
+
:
[
Ar
]
3
d
5
4
s
0
Sc
3
+
do not contain unpaired electron, hence it will not undergo
d
−
d
transition and do not show colour.
© examsnet.com
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