Chemical Process
Direct conversion of chemical energy into electrical energy is done in a

Magnetohydrodynamic (MHD) generator
None of these
Fuel cell
Fast breeder reactor

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Chemical Process
Liquefaction of gases can not be done by

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

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