The stability ${\rm{of}}\,{\rm{ + }}\,{\rm{1}}$ oxidation state among $Al,\,Ga, In \,\&\, TI$ increases in the sequence:

$TI\, < \,In\, < \,Ga\, < \,Al$

$\,In\, < \,TI < Ga\, < \,Al\,$

$Ga\, < \,In\, < \,Al\, < \,TI$

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

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The stability

\mathrm{of}\,\mathrm{ + }\,\mathrm{1}

oxidation state among

Al,\,Ga, In \,\&\, TI

increases in the sequence:

View answer and explanation

Correct option: D

Al\, < \,Ga\, < \,In < \,TI

Option D (

Al\,<\,Ga\,<\,In <\,TI

) is correct because the inert pair effect becomes more prominent down the group, stabilizing the +1 oxidation state for heavier elements like Thallium.

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

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