Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

Greater tendency of decomposition at elevated temperature
Poor oxidation stability and high gum forming tendency
All of these
Hydrolysis tendency in presence of water

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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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Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Putting more quantity of V₂O₅ catalyst in the converter
Increasing the oxygen concentration
Maintaining low temperature & pressure in the converter
Removing some quantity of SO₃ during intermediate stage

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