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The valancy of impurity atom added to silicon to make it P type is

$(a)\;4 \\ (b)\;5 \\ (c)\;3 \\ (d)\;6 $

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The valancy of impurity to make n-type is 5 and to make it p-type is 3.
Hence c is the correct answer.
answered Jan 28, 2014 by meena.p
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