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Q.

CCl4 is well known fire extinguisher. However after using it to extinguish fire, the room should be well ventilated. This is because

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a

It is flammable at higher temperatures

b

It is toxic

c

It produces phosgene by reaction with water vapour at higher temperatures

d

It is corrosive

answer is C.

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Detailed Solution

Carbon tetrachloride vapours react with steam above 500°C to form phosgene, a poisonous gas 

CCl4+H2O⟶500∘CCOCl2 phosgene +2HCl.

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