Verified Solution • 2025–26 Session
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QJEEM21Ch322c: JEE Main 2021 Chemistry - Class 12 JEEM21Ch322c Solution: Given below are two statements : one is labelled as Assertion A …
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.
Reason R : Tl metal has fourteen f electrons in its electronic configuration.
In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.
Reason R : Tl metal has fourteen f electrons in its electronic configuration.
In the light of the above statements, choose the most appropriate answer from the options given below :
Multiple Choice Options
- A A is correct but R is not correct
- B A is not correct but R is correct
- C Both A and R are correct but R is NOT the correct explanation of A
- D Both A and R are correct and R is the correct explanation of A
Step-by-Step Verified Solution
A : Due to inert pair effect, Tl is more stable in +1 oxidation state
Hence TlI3 and CSI3 are isomorphous
R : Electronic configuration of Tl (81) = [Xe] 4f14 5d10 6s2 6p1
Both A and R are correct but R is not the correct explanation of A.
Hence TlI3 and CSI3 are isomorphous
R : Electronic configuration of Tl (81) = [Xe] 4f14 5d10 6s2 6p1
Both A and R are correct but R is not the correct explanation of A.