Chemical Process
Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.

Copper
Chromium
Arsenic
Mangnese

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Chemical Process
Linde process of gas liquefaction employs

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

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