Potassium nitrate is used in
medicine
fertiliser
salt
glass
Permanent hardness of water may be removed by the addition of
sodium carbonate
alum
potassium permanganate
lime
Soda water contains
carbonic acid
sulphuric acid
carbon dioxide
nitrous acid
The most important ore of aluminium is
galena
calamine
calcite
bauxite
Most soluble in water is
camphor
sulphur
common salt
sugar
Which of the following was to be discovered first in the chromospheres of the sun?
Krypton
Xenon
Neon
Helium
Which of the following is in liquid form at room temperature?
Lithium
Sodium
Francium
Cerium
Sodium metal is kept under
petrol
alcohol
water
kerosene
Which of the following are the ingredients of gun metal?
Iron, Zinc, Titanium
Iron, tin
Iron, Brass, Tin
Copper, Tin
From which mineral is radium obtained?
Rutile
Haematite
Limestone
Pitchblende