$C C l 4$ is used as a fire extinguisher because

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Its melting point is high

It forms covalent bonds

Its boiling point is low

It gives incombustible vapours

answer is D.

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Detailed Solution

Concept: The colourless liquid known as carbon tetrachloride is insoluble in water. Low concentrations of its sweet odour can be perceived. It has a high boiling point but a low melting point.
Under the name pyrene,

is utilised as a fire suppressant. In order to prevent oxygen or air from contacting the fire from the burning things and to supply incombustible vapours, the dense carbon tetrachloride vapours form a protective layer on the burning materials.
The removal of grease from metals and dry cleaning both require carbon tetrachloride. It is employed in the production of propellants for aerosols and refrigerants. It is a carcinogen that can cause mortality as well as harm to the brain, liver, and kidneys when inhaled or ingested. Proton NMR spectroscopy employs it. Chlorofluorocarbons are widely produced using carbon tetrachloride as a precursor (CFCs).
Hence, option 4 is the correct answer.

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