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Question

Match the oxide of column I with their corresponding property (ies) in column II.

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Solution

(A) Oxidation state of Pb in Pb3O43x+(8)=0
Pb3 must cancel out the 8 and therefore, Pb must have overall oxidation number of +8 or +8/3. However, oxidation numbers cannot be a fraction.
Pb3O4 actually exists as a mixture of PbO and PbO2 in the ratio 2:1. The oxidation states of each are +2 and +4. It can act as both acid and base. Hence, it is amphoteric in nature.
(B) Oxidation state of Sn in SnO2x+(4)=0x=+4
SnO2 can act as acid and base therefore is amphoteric in nature.
(C) Oxidation state of Pb in PbO2x+(4)=0x=+4 It is a base in nature.
(D) Oxidation state of C in CO2x+(4)=0x=+4
It is acidic in nature.
(E) Oxidation state of Ge in GeOx+(2)=0x=+2. It is amphoteric in nature.

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