Page 1 - 4. Home Assignment-Elements,compounds and mixtures

SAI International School
Subject-Chemistry
Ch-Is Matter around us pure?

Topic-Elements, compounds and Mixtures
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: Iodine has a shiny surface

Reason: Iodine is a metal

Q.2 Assertion: The properties of water are different from those of hydrogen and
oxygen.

Reason: In a compound the constituent elements lose their elemental properties.

Q.3 Assertion: The components of air cannot be separated.

Reason: Air is mixture.

Q.4 Assertion: Copper is good conductor of heat and electricity.

Reason: Copper is a metal.

Q.5 Assertion: Iron sulphide is not attracted towards a magnet.

Reason: Iron sulphide is a mixture.

Q.6 Which of the following is incorrect about elements?

a) They are composed of same kind of atoms

b) They are pure substances

c) They are heterogeneous

d) They can not be converted into anything simpler.

Q.7. Which of the following can be represented by a chemical formula?

a) sugar solution c) Water

b) Air d) soil

Q.8 What is the name given to the pure substances which are composed of different
elements combined chemically

a) Elements b) mixture
c) compounds d) metalloids