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Consider the following elements In, Tl, Al, Pb, Sn and Ge.
The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

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+2 and +3

+1 and +4

+4 and +1

+4 and +3

answer is C.

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Detailed Solution

Among Al, In, Tl, Ge, Sn, Pb, the metal having highest IE₁ is Ge and lowest IE₁ is In.
Most stable oxidation state of Ge is +4 and In is +3.

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