The two compounds used as refrigerants are
1. `NH_(3) 2. `C Cl_(4)`
3. `CF_(2)` 4. `CF_(2) Cl_2`
A. 1,2
B. 2,3
C. 1,3
D. 1,4

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Correct Answer - D
1 and 4 Both can be liquefied easily.

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