MCQOPTIONS
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				| 1. | 
                                    The best pickling solution for gypsum bonded investment is_______________? | 
                            
| A. | Hydrochloric acid | 
| B. | Nitric acid | 
| C. | Sulphuric acid | 
| D. | Phosphoric acid | 
| Answer» B. Nitric acid | |