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AIIMS 201925 May
Exam
AIIMS
Year
2019
Date
25 May
Subject
Chemistry
Chapter
Structure of Atom

AIIMS 2019 · 25 May · Chemistry · Structure of Atom

Assertion : The free gaseous Cr atom has six unpaired electrons....

Assertion : The free gaseous Cr\mathrm{Cr} atom has six unpaired electrons. Reason : Half-filled ss-orbital has greater stability.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

The 3d3 d-subshell in case of Cr gets exactly half-filled with configuration 3d54s13 d^5 4 s^1 which imparts stability to the atom.
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