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A p-type semiconductor is (i) a silico...

A p-type semiconductor is
(i) a silicon crystal doped with arsenic impurity
(ii) a silicon crystal doped with aluminium impurity
(iii) a germanium crystal doped with boron impurity
(iv) a germanium crystal doped with phosphorus impurities.

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The correct Answer is:
A, B, C, D
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