Which one of the following set of raw material is most suitable for
manufacture of urea.
Which of the following potassium fertilizers are more useful for
horticultural crops tobacco and potatatoes.
The percentage of nitrogen in ammonium sulphate is__________%
_________ is preferred for horticultural crops and for tobacco and
potatoes.
What refer to the casehardening process by which the carbon content of
the steel ear the surface of a part is increased?
What is a coal that has been previously burned in an oxygen poor
environment?
