Common oxidation state of IVA group elements is

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+IV

+III

+II

answer is A.

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Detailed Solution

For IV A group elementsCommon oxidation state is : "+4"C shows :- +4 , -4Si:- +4 [Stable]→ For Ge,Sn +4 is stable oxidation state hence in +2 oxidation state they acts as reducing agents→ Where as for Pb '+2' oxidation state is stable [due to inert pair effect] hence in +4 oxidation state Pb acts as oxidising agent→ Higher oxidation state is due to involvement of ns and np electronsi.e., Lower oxidation state is due to involvent of only np electroni.e., ns2 np(2) ⇒ +2Higher oxidation state stability dcecreases from top to bottomLower oxidation stability increases from top to bottomGe+2 < Sn+2 < Pb+2 Stability order

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