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Q.

To make a germanium crystal into a N type semi conductor the valency of the impurity atom that needs to be added is 

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a

6

b

3

c

4

d

5

answer is B.

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Detailed Solution

Every pentavalent impurity atom donates one free electron.

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To make a germanium crystal into a N type semi conductor the valency of the impurity atom that needs to be added is