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 $\mathrm{Ga}$, $\mathrm{In}$ 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 :

$\mathrm{A}$ is true but $\mathrm{R}$ is false.

Both $\mathrm{A}$ and $\mathrm{R}$ are true but $\mathrm{R}$ is NOT the correct explanation of $\mathrm{A}$.

$\mathrm{A}$ is false but $\mathrm{R}$ is true.

JEE CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

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Understanding +4 | -1

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}

\mathrm{In}

and

\mathrm{Tl}

\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 :

View answer and explanation

Correct option: A

Both

\mathrm{A}

and

\mathrm{R}

are true and

\mathrm{R}

is the correct explanation of

\mathrm{A}

Option A is correct because the inert pair effect increases down the group, stabilizing the +1 oxidation state in Tl more than in Ga or In.

JEE CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

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