Chemical Process
A mineral is termed as 'ore', if

It contains ≥ 40% metal
The metal present in it is costly
A metal can be economically extracted from it
All of these

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Chemical Process
Reverse osmosis is normally used for the

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

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