MCQOPTIONS
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				| 1. | 
                                    Neutral water with pH about 7 becomes slightly acidic when aerated. This is because [NDA] | 
                            
| A. | oxygen from air is dissolved in the water which makes the water acidic | 
| B. | dirt, which get contaminated with the water during aeration makes the water acidic | 
| C. | ultraviolet radiation dissociates water molecules and makes water acidic | 
| D. | carbon-dioxide from air is dissolved | 
| Answer» E. | |