Chemical Process
Claude process of gas liquefaction employs

Merely compression of gas beyond its critical pressure
Joule-Thomson expansion cooling
Adiabatic expansion against a piston or in a turbine
Heat exchange 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)
Arc process of nitric acid manufacture is economical as compared to Ostwald
About 90% of nitric acid is manufactured by Ostwald
It is a strong mono basic acid which reacts with almost all the metals except noble metals

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