Q.

When Arsenic atoms are added Germanium lattice, it becomes a/an -

A. Insulator
B. Superconductor
C. Intrinsic semiconductor
D. Extrinsic semiconductor
Answer» D. Extrinsic semiconductor
Explanation: When a peritavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with thegermanium atoms, leaving 1 electron relatively free in the crystal structure. Pure germanium may be converted into an N-type semiconductor by "doping" it with any donor impurity having 5 valence electrons in its outer shell. Semiconductors which are doped in this manner - either with N- or P-type impurities - are referred to as EXTRINSIC semiconductors.
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