Chemical Process
Saponification number of an oil or fat

Gives an idea about its molecular weight
Detects its adulteration
Is inversely proportional to its molecular weight
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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Chemical Process
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is

Still in development stage (by employing fluidised bed technique)
A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
All of these
A slow reaction

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Chemical Process
Use of hydrated lime in water treatment

Before filtration, reduces the bacterial load on filters
Is to adjust the pH value
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
All of these

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