Chemical Process
The purpose of tanning in leather industry is to

Stiffen the leather
Impart water resistance
Make it flexible
Smoothen the leather

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

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

ANSWER DOWNLOAD EXAMIANS APP