The important ore of aluminium is-
An electric iron has a heating element made of:
Formation of ozone hole is maximum over
The gas used for filling weather balloons is-
The absolute value of the charge on electron was determined by-
The important ore of aluminium is-
Which one amongst the following is not a Green House gas?
A polymeric substance used to make parachute is
The acid used in lead storage cells is-
Alum stops bleeding in minor cuts because of
