Chemical Process
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

Pollution of water stream by mercury
Non-availability of high purity mercury
High specific gravity of mercury
High cost of mercury

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Chemical Process
Linde process of gas liquefaction employs

Adiabatic expansion against a piston or in a turbine
Merely compressing the gas beyond its critical pressure
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)

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