Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : In \(\mathrm{TlI_3}\), isomorphous to \(\mathrm{CsI_3}\), 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 \(\mathrm{TlI_3}\), isomorphous to \(\mathrm{CsI_3}\), 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 :
Show Hint
- A is correct but R is not correct
- A is not correct but R is correct
- Both A and R are correct but R is NOT the correct explanation of A
- Both A and R are correct and R is the correct explanation of A
The Correct Option is C
Solution and Explanation
Reason R: Tl (Z = 81) has the configuration \([\mathrm{Xe}]\,4f^{14}5d^{10}6s^26p^1\), which has fourteen f electrons; R is correct.
The stability of the +1 state is due to the inert pair effect (reluctance of the \(6s^2\) pair to take part in bonding), not the presence of 14 f electrons, so R is not the correct explanation of A.
Answer: (3) Both A and R are correct but R is NOT the correct explanation of A
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