Question No : 8
Triple superphosphate is manufactured by reacting
Question No : 9
Phthalic anhydride is used
Question No : 10
The yield of tar from high temperature carbonisation of dry coal is about __________ percent.
Question No : 11
Phenol formaldehyde is produced by condensation polymerisation. It is also known as
Question No : 12
Paper grade bamboo contains about __________ percent cellulose.
Question No : 13
High temperature carbonisation of coal produces
Question No : 14
Salt is the basic raw material for the manufacture of