Chemical Process
Saponification value/number of an oil or fat is a measure of its

Average molecular weight
Fatty acid content
Degree of unsaturation of the fatty acids present in it
Insoluble fatty acid content

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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)
A slow reaction
All of these

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