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| Q. |
Why is water not suitable for putting out a petrol fire? |
| A. | The oxygen content of water is isolated by petrol and thus it helps in burning |
| B. | Petrol is too inflammable to be extinguished by water |
| C. | The heat required for combustion of petrol is very low |
| D. | Water, being heavy, slips below petrol which thus remains in contact with air and burns |
| Answer» D. Water, being heavy, slips below petrol which thus remains in contact with air and burns | |
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Explanation: Water is not effective on petrol fire because it has higher density than petrol as a result of which it sinks to the bottom, while petrol stays afloat and keeps burning. Petro- chemical fires are nearly always extinguished with chemical foam which forms a blanket over the flames and cuts off the oxygen supply. |
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