Chemical Process
Raw materials for 'Solvay Process' for manufacture of the soda ash are

Ammonia limestone and coke
Ammonia, salt and limestone
None of these
Salt, limestone and coke or gas

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Chemical Process
Liquefaction of gases can not be done by

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

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