Q. In which liquid can ice be kept without melting?

A
Potassium permanganate solution
B
Baking soda solution
C
Ammonium chloride solution
D
Liquid ammonia
Solution:

Liquid that keep ice from melting is liquid ammonia.

When liquid ammonia vapourizes it absorbs large quantities of heat without changing its temperature for this reason ammonia is mainly used as refrigerant.

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