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Q.

The chemical used for cooling in refrigeration is

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a

${NH}_{4} Cl$

b

${NH}_{4} OH$

c

Liquid ${NH}_{3}$

d

${CO}_{2}$

answer is D.

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Detailed Solution

${NH}_{3}$ is highly volatile compound. When vapourized, liquid ammonia causes intense cooling. Hence used as a coolant in ice factories and cold storages.

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