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| Q. |
Which gas is used in fire extinguishers? |
| A. | Carbon dioxide |
| B. | Nitrogen oxide |
| C. | Carbon monoxide |
| D. | Sulpher dioxide |
| Answer» A. Carbon dioxide | |
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Explanation: Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire. |
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