MCQOPTIONS
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				| 1. | 
                                    Which of the following chemicals is used in foam fire extinguishers? [NDA] | 
                            
| A. | Aluminium sulphate | 
| B. | Copper sulphate | 
| C. | Cobalt sulphate | 
| D. | Nickel sulphate | 
| Answer» B. Copper sulphate | |