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

Chromium
Mangnese
Copper
Arsenic

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Chemical Process
Reverse osmosis is normally used for the

Desalination of brackish water to produce potable (drinking) water
Separation of helium from natural gas
Purification of oxygen
Separation of isotopes of uranium from gaseous uranium hexaflouride

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