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

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)
About 90% of nitric acid is manufactured by Ostwald

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Chemical Process
Reverse osmosis is normally used for the

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

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