Page 1 - Home Assignment 1.Sub and Obj

SAI International School
Subject-Chemistry

Ch-Is Matter around us pure?
Topic-Distillation, fractional distillation and crystallisation
HOME ASSIGNMENT

OBJECTIVE ASSESSMENT
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 pure copper sulphate is obtained from an impure sample of it by
crystallisation
Reason: Pure copper sulphate crystals crystallise out leaving behind the impurities.
Q.2 Assertion: Alcohol and water can be separated by the process of simple
distillation.
o
Reason: The difference between their boiling points is less than 25 C.
Q.3 Assertion: The different components of air can be obtained by fractional
distillation.
Reason: The difference between the boiling points of different components of air are
o
more than 25 C.
Q.4Assertion:Evaporation is a better process than crystallisation
Reason: Evaporation is a faster process.
Q.5 Assertion: Distillation is a better process for separation of salt from salt solution.
Reason: Salt does not decompose on heating.
Q.6 Acetone can be separated from water by:
a) Sublimation b) separating funnel
c) distillation d) fractional distillation
Q.7 The separation by fractional distillation is based on:
a) Difference in boiling point of liquids b) Immiscibility of liquids
c) Solubility of liquids in the same solvent d) None of the above
Q.8 Which separation techniques will you apply for the separation of the following?
(a) Different components of petroleum.
(b) Pure copper sulphate crystals from impure sample of it
(c) Acetone from a mixture of water and acetone.
Q.9 What are the advantages of crystallisation over evaporation?
Q.10 Explain the process of distillation with a labelled diagram.
SUBJECTIVE ASSESSMENT
Sl.No. Questions Mark Skill
Q.1 Q.1 What is the purpose of having glass beads in the fractionating 1 E/A
column?