Chemical Process
Common salt is generally not produced commonly by __________ method from brine.

Vacuum evaporation
Freeze drying
Solar evaporation
Electrolytic

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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

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

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Chemical Process
Fluorescent dyes are added in detergents to

Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
None of these
Act as tarnish inhibitor for metals like German silver
Attain distinctiveness from other brands

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