Join the Most Relevant JEE Main 2025 Test Series & get 99+ percentile! Join Now
Open MARKS Web Download App
Search any question & find its solution
Question: Answered & Verified by Expert
Assertion : The free gaseous $\mathrm{Cr}$ atom has six unpaired electrons.
Reason : Half-filled $s$ orbital has greater stability.
ChemistryStructure of AtomAIIMSAIIMS 2004
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion
  • B If both assertion and reason are true but reason is not the correct explanation of assertion
  • C If assertion is true but reason is false
  • D If both assertion and reason are false.
Solution:
1811 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false
$:{ }_{24} \mathrm{Cr} \rightarrow[\mathrm{Ar}] 3 d^4 4 s^2$ $\mathrm{Cr} \rightarrow[\mathrm{Ar}] 3 d^5 4 s^1$
Half-filled $d$-orbital has greater stability.

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.

Use on iOS or Desktop Download from Google Play