MCQOPTIONS
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				| 1. | 
                                    Which of the following elements act as donor impurities? GoldPhosphorusBoronAntimonyArsenicIndium Select the correct answer using the codes given below: | 
                            
| A. | 1, 2, 3 | 
| B. | 1, 2, 4, 6 | 
| C. | 3, 4, 5, 6 | 
| D. | 1, 4, 5 | 
| Answer» E. | |