Page 2 - Home Assignment 3.Practical Worksheet

chemically bonded together. D is a pure substance. We can decompose D into A
and C using

chemical methods.

1. Which substance is a compound?

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2. Which substance is a mixture? What kind of methods can be used to separate its
constituents?

PTO

MCQ
1. Carbon disulphide is used to dissolve sulphur from a mixture of sulphur powder and
iron filings. The precaution required to handle carbon disulphide
is :
(a) keep away from air (b) keep away from iron sulphide
(c) keep away from water (d) keep away from flame
2. In which solvent as given below sulphur of a mixture of iron filings and sulphur powder
dissolves?

(a) I (b) II (c) III (d) IV

A black mass of Iron sulphide is crushed into powdered form and taken on a watch
3. glass. When a magnet is brought near the powdered black mass of Iron sulphide,
then :
(a) whole compound of Iron sulphide, will be attracted towards magnet.
(b) only Iron will be attracted towards magnet.
(c) only sulphur will be attracted towards magnet.
(d) black mass of Iron sulphide will be unaffected.
4. Raman added carbon disulphide in a test tube containing a mixture of iron filings and
sulphur, After shaking the test tube he will observe that :
(a) A brown gas is evolved .
(b) Sulphur dissolves to form colour less solution and iron filings settle down.
(c) Sulphur dissolves to form a yellow solution and iron filings settle down.

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