Q.

Oxidation state of element in cassiterite and in galena respectively is 

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a

+4 ; -2

b

-2 ; +2

c

+4 ; +2

d

-2 ; -2

answer is D.

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Detailed Solution

Cassiterite - SnO2 oxidation state of Sn = +4

Galena PbS oxidation state of Pb = +2

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