Click the correct answer (True or False).
Click the correct answer.
Which of the following metals is brittle and crumbles into powder?
Mercury
Zinc
Potassium
Calcium
Which of the following non-metals is a good conductor of heat and electricity?
Bromine
Iodine
Sulphur
Graphite
Which of the following is not a characteristic of a mixture?
A mixture has fixed boiling and melting points.
The constituents of a mixture are not present in a definite ratio.
There is no chemical reaction taking place amongst the constituents of a mixture.
The constituents of a mixture retain their original properties.
What is the common name of sodium bicarbonate?
Common salt
Washing soda
Vinegar
Baking soda
Which of the following is an example of liquid-gas homogeneous mixture?
Water in sponge
Oil in water
Moisture in air
Hydrogen in palladium
Click the correct answer.
and compounds are pure substances.
Elements
Atoms
Substances
Mixtures
are represented by chemical formulae.
Symbols
Elements
Mixtures
Compounds
Phosphorus contains
atoms in its molecule.
two
more than three
one
less than three
are physical combinations of two or more elements or compounds in any proportion.
Compounds
Atoms
Mixtures
Elements
Salt solution is a
mixture.
heterogeneous
homogeneous
processed
unprocessed
Blood is a
mixture.
heterogeneous
homogeneous
processed
unprocessed
A mixture of two miscible liquids is separated by
.
chromatography
boiling
evaporation
fractional distillation
Liquids which do not mix with each other and form separate layers are called
.
immiscible liquids
emulsion
solutions
miscible liquids
The technique of
is based on the principle of selective adsorption.
chromatography
distillation
sublimation
evaporation
The number of atoms contained in a molecule of an element is called its
.
molecular formula
chemical formula
atomicity
mixture
