MCQOPTIONS
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				| 1. | 
                                    The main industrial source of emission of hydrogen sulphide air pollutant is | 
                            
| A. | petroleum refineries. | 
| B. | coal based thermal power plants. | 
| C. | pulp and paper plant. | 
| D. | metallurgical roasting & smelting plant. | 
| Answer» C. pulp and paper plant. | |