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Question

The aqueous solution containing which one of the following ions will be colourless?
[Atomic number of Sc=21, Fe=26, Ti=22, Mn=25]

A
Sc3+
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B
Fe2+
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C
Ti3+
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D
Mn2+
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Solution

The correct option is A Sc3+
(a) 21Sc3+=1s2,2s2,2p6,3s2,3p6
It is colourless due to absence of unpaired electrons in d-subshell.

(b) 26Fe2+=1s2,2s2,2p6,3s2,3p63d6
It has colour due to presence of four unpaired electrons in d-subshell.

(c)22Ti3+=1s2,2s2,2p6,3s2,3p63d1
It has colour due to presence of one unpaired electrons in d-subshell.

(d) 25Mn2+=1s2,2s2,2p6,3s2,3p63d5
It has colour due to presence of 5 unpaired electrons in d-subshell.

Hence, option A is correct.

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