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Question

Which among the following is colorless?


A

Sc2+

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B

Zn2+

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C

Ti3+

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D

V3+

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Solution

The correct option is B

Zn2+


Explanation for the options

(B)Zn2+

  • The electronic configuration of Zn2+ is 1s22s22p63s23p63d10.
  • Zn2+is colorless due to the absence of unpaired electrons.
  • It has completely filled d-orbitals

Explanation for incorrect options

  • The electronic configuration of Sc2+ is 1s22s22p63s23p63d1.So, one unpaired electron is present in the d orbital.
  • The electronic configuration of Ti3+ is 1s22s22p63s23p63d1.So, one unpaired electron is present in the d orbital.
  • The electronic configuration of V3+ is 1s22s22p63s23p63d2.So, two unpaired electrons are present in the d orbital.
  • Due to unpaired electrons in Sc2+,Ti3+, and V3+, these are colored.
  • Hence, options (A), (C), and (D) are incorrect.

Hence, option (B) is correct. Zn2+ is colorless.


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