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1. Which of the following elements act as donor impurities? GoldPhosphorusBoronAntimonyArsenicIndium Select the answer using the following codes :
(A): 1, 2 and 3
(B): 1, 2, 4, and 6
(C): 2, 4 and 5
(D): 3, 4, 5 and 6
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By: guest on 02 Jun 2017 12.51 am
Only antimony, arsenic and phosphorous are pentavalent.
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