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SAI International School
Subject-Chemistry

Ch-Is Matter around us pure?
Topic-Separation techniques introduction, Evaporation, centrifugation
HOME ASSIGNMENT

OBJECTIVE QUESTIONS
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.1 Assertion: The mixture containing iron filings and sulphur can be separated by
centrifugation.
Reason: Iron is a magnetic substance
Q.2 Assertion: The different components of blood can be separated by centrifugation
Reason: The components of blood are too small so that they can pass through a filter
paper.
Q.3 Assertion: Common salt is obtained from sea water by evaporation.
Reason: Common salt is soluble in water.
Q.4Assertion:Cream is separated from milk by centrifugation.
Reason: On rotating milk very fast the denser particles go to the bottom where as the
lighter particles stay at the top.
Q.5 Assertion: The small stones from rice grains can be separated byhand picking.
Reason: The particle are not visible to naked eye.
Q.6 Sugar can be separated from sugar solution by:
a) Hand picking b) Boiling
c) centrifugation d) evaporation
Q.7 Gold is obtained from gold mines by?
a) Filtration b) Hand picking
c) Evaporation d) Magnetic separation