A) Trivalent impurity
B) Tetravalent impurity
C) Pentavalent impurity
D) Divalent impurity
Correct Answer: A
Solution :
Ge is group 14 element. Positive holes can be created by adding group 13 element, i.e. trivalent impurity. It has 4 valence electrons, impurities added may be of element which may have more than 4 valence electrons of which have less than 4 electrons ex. Group 13 elements.
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