The correct answer is B
The gas used for filling weather balloons is-
The nucleus of an atom consists of-
Bronze is an alloy of-
The element used in the manufacture of safety matches is —
The important ore of aluminium is-
Which of the following is a physical change?
Manganite is an ore/mineral of
___________ is the process in which acids and bases react to form salts and water.
The acid used in lead storage cells is-
The fuel that is used in modern submarines is -
