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Handpicking

A mixture of ...

Question

A mixture of iron dust and sulphur powder can be separated by:

A

Using a magnet

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B

Hand picking

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C

Filtration

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D

Dissolving sulphur in sulphuric acid

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Solution

The correct option is A
Using a magnet

Magnet is moved above the mixture of iron dust and sulphur powder. Iron dust gets clinged to the magnet and get separated. Sulphur powder is not attracted by magnet so it remains behind.

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Q. Give reasons:
(a) Sand and saw dust cannot be separated by hand picking.
(b) Magnet is used to separate a mixture of iron and sulphur.

Q. How will you separate a mixture of iron fillings and sulphur powder without using carbon disulphide ?

Q. Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.

A mixture of sulphur powder and water can be separated by _______ .

Q. 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

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