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The gas can be liquefied by:  A. Lowering temperature and pressure

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The gas can be liquefied by:

 A. Lowering temperature and pressure

B. Raising temperature and pressure

C. Lowering temperature and raising pressure

D. Lowering pressure only

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By lowering temperature, the energy of surroundings become less than that of the gaseous particles. Then there is a transfer of energy from gas to the surroundings. Thus the gas molecules lose energy and get converted to a liquid state.

By raising pressure, the particles of gas come closer and closer and get converted to a liquid state.

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