Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called

A. Carbon Monoxide

B. Phosgene

C. Phosphine

D. None of these

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  20. The property of a substance to absorb moisture from the air on exposure is called
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  23. The removal of top soil by water or wind is called
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  27. Apparatus invented by Archimedes is :
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