The use of explosives in order to convert rocks into small pieces of stones is done in _______

Which of the following is the hottest part of the blast furnace?

Which of the following is the black oxide of iron?

The material obtained at the end of the shingling process is called as ____

Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on gettin…

The process of extraction of the certain required amount of water from air is known as _______

Corrosion of ferrous metals is known as _______

Which of the following facts about gypsum is not correct?