JEE Mains · Chemistry · STD 11 -p-Block elements - I
Given below are two statements: One is labelled as Assertion \(A\) and the other is labelled as Reason \(R\): Assertion \(A\) : The stability order of +\(1\) oxidation state of \(\mathrm{Ga}\), In and \(\mathrm{Tl}\) is \(\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}\). Reason \(R\) : The inert pair effect stabilizes the lower oxidation state down the group. In the light of the above statements, choose the correct answer from the options given below :
- A Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\).
- B \(A\) is true but \(R\) is false.
- C Both \(A\) and \(R\) are true but \(R\) is \(NOT\) the correct explanation of \(A\).
- D \(A\) is false but \(R\) is true.
Answer & Solution
Correct Answer
(A) Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\).
Step-by-step Solution
Detailed explanation
The relative stability of +\(1\) oxidation state progressively increases for heavier elements due to inert pair effect. \(\therefore\) Stability of \(A \ell^{+1}<\mathrm{Ga}^{+1}<\mathrm{In}^{+1}<\mathrm{T} \ell^{+1}\)
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