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SAI International School
Subject-Chemistry

Ch-Is matter around us pure?
Topic:Properties and concentration of solutions, Colloids and their
properties&Different types of colloids

PRACTICE WORKSHEET
MCQs
Q.1Which of the following settle down when kept undisturbed for some time?
(a) blood in water
(b) muddy water
(c) copper sulphate solution
(d)Egg albumin in water
Q.2 Paints often need to be stirred thoroughly before use because it is a/an
(a) gel.
(b) emulsion.
(c) foam.
(d) aerosol.
Q.3 A solution of copper sulphate was prepared by dissolving 50g of copper sulphate in
450g of water. The concentration of the solution in mass percent is:
a) 10 % (m/m)
b) 10% (m/v)

c) 10%(v/v)
d) 10%(v/m)

DIRECTION:Each of these questions contains an Assertion followed by Reason. Read
them carefully and answer the question on the basis of following options. You have to
select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of
Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.

Q.4. Assertion :When a beam of light is passed through a colloidal solution placed
in a dark place the path of the beam becomes visible.
Reason :Light gets scattered by the colloidal particles.

Q.5. Assertion :True solution exhibits Tyndall effect.
Reason :Particles are very large in size.