GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Nitrogen oxide
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Carbon dioxide
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Sulpher dioxide
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Carbon monoxide
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Detailed explanation-1: -Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge.
Detailed explanation-2: -Carbon dioxide (CO2) is stored in extinguishers in the liquid phase. It vaporizes when released thereby smothering a fire by excluding the air (oxygen) needed for combustion.
Detailed explanation-3: -On a volume basis, carbon dioxide is approximately twice as effective as nitrogen (e.g., for ethanol fires, the minimum required volume ratios of carbon dioxide and nitrogen to air are 0.48 and 0.86, respectively).
Detailed explanation-4: -CARBON DIOXIDE (CO2) CO2 fire extinguishers have a black label. They were originally designed for use on flammable liquid fires and therefore have a class B fire rating. They can be used on electrical fires, as CO2 is not a conductor and they do not leave behind any harmful residue.
Detailed explanation-5: -CO2 fire extinguishers contain carbon dioxide gas (CO2) under very high pressure (about 55 bar at room temperature) and can be easily recognised by their flute-shaped discharge horn.