Chemical Process
One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to

Adjust the pH of the syrup
Reduce the viscosity of the syrup
Remove the coloring matter from the syrup
Improve the rate of crystallisation of sugar

ANSWER DOWNLOAD EXAMIANS APP

Chemical Process
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is

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

ANSWER DOWNLOAD EXAMIANS APP