Chemical Process
Liquefaction of gases can not be done by

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

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Chemical Process
Pick out the wrong statement pertaining to nitric acid.

Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)
It is a strong mono basic acid which reacts with almost all the metals except noble metals
Arc process of nitric acid manufacture is economical as compared to Ostwald
About 90% of nitric acid is manufactured by Ostwald

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