Which contains many minerals like bicarbonates, chlorides and sulphates of calcium and magnesium?
hard water
soft water
liquid oxygen
solid carbondioxide
Air also contains about__________________% of water vapour.
70%
3%
0.4%
0.04%
The ratio of hydrogen to oxygen by mass in water is
1:2
8:1
1:8
2:1
___________is used to study the composition of water by volume.
Ostwald viscometer
Hoffman's voltameter
Nanometer
Barometer
The contamination of water with soluble salts, sewage and industrial wastes which eventually destroys the balance of life in a stream is defined as
air pollution
water pollution
pollutants
soil pollution
Which is used for making underground pipes?
plastic coating
Enamel coating
Oil paints
Coal tar
Which is known as universal solvent?
water
alcohol
either
kerosene
The substance that dissolves in water or in any other liquid is called as
solvent
solution
solid
solute
The electrode connected to the negative end of the battery is called
Anode
Cathode
Electrode
Electrolyte
_____________causes Leucoderma, skin cancer.
Nickel
Chromium
Cadmium
Uranium
