How much percentage of nitrogen makes the air?
a) 21%
b) 78%
c) 0.04%
d) 0.9%
Which of the following is/are the characteristic/s of Nitrogen?
a) it is colorless
b) it does not combine with other substance
c) it is odourless
d) all of these
On high mountains, which of the following is lower in concentration in air?
a) nitrogen
b) water
c) oxygen
d) none of these
Separating Mixtures:
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture
Which of the following method of physical separation is/are used to separate the substances of a mixture?
a) hand sorting
b) sieving
c) evaporation
d) all of these
Which of the following method of physical separation is/are used to separate the substances of a mixture?
a) filtration
b) distillation
c) chromatography
d) all of these
