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AIIMS 2004
Exam
AIIMS
Year
2004
Subject
Chemistry
Chapter
Structure of Atom

AIIMS 2004 · 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

:24Cr→[Ar]3d44s2:{ }_{24} \mathrm{Cr} \rightarrow[\mathrm{Ar}] 3 d^4 4 s^2 Cr→[Ar]3d54s1\mathrm{Cr} \rightarrow[\mathrm{Ar}] 3 d^5 4 s^1 Half-filled dd-orbital has greater stability.
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