Q.
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a
Increases when it is doped with tetravalent impurity
b
Increases when it is doped with trivalent impurity and decreases when it is doped with pentavalent impurity
c
Increases when it is doped with trivalent or pentavalent impurity
d
Increases when it is doped with pentavalent impurity and decreases when it is doped with trivalent impurity
answer is C.
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