Chemical Process
DDT should not be allowed to come in contact with iron (during its manufacture) to

Achieve non-hygroscopic property
Prevent sulphonation of the monochlorobenzene by the acid catalyst
None of these
Avoid its decomposition

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Chemical Process
Reverse osmosis is normally used for the

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

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