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Q.

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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a

+2 and +3

b

+1 and +4

c

+4 and +1

d

+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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