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

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

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