Question

A student, by mistake, mixed sulphur powder with iron filings. The following techniques were suggested to separate the sulphur from the mixture out of which he has to choose one A. dissolving in carbon disulphide, filtration, evaporation
B. dissolving in water at room temperature and filtration
C. dissolving in hot water, filtration and evaporation
D. dissolving in ice cold water and filtration
The correct technique is (1) A
(2) B
(3) C
(4) D

Answer 1

Answer:

The correct answer is (A) dissolving in carbon disulphide, filtration, evaporation

Explanation:

The Mixed solution of sulphur powder and iron filings is mixture of two compounds results in the reaction. As we need to extract the sulphur from the mixed solution by following techniques:

(1). Sulphur will dissolve in carbon disulphide, So by dissolving it in the carbon disulphide can give us the sulphur.

(2). As Iron has magnetic properties so it settles down as a residue when filtration is done.

(3). evaporation of filtrate will results in getting sulphur back.

Answer 2

Answer is Option (c)

Explanation:

• Iron fillings can be separated from the Sulphur, by either rolling a magnet over the mixture. The iron fillings will be attracted by the magnet, due to magnetic effect or magnetism.

Or

• To the mixture containing sulphur and iron fillings add carbon disulphide, this will dissolve sulphur, leaving behind iron fillings.

Therefore the correct option is (c.) carbon disulphide.