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Standard XII
Chemistry
Magnetic Separation
Which of the ...
Question

Which of the following statements is true about magnetic separation?

A
It is used when only ores are magnetic in nature.
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B
It is used when only impurities are magnetic in nature
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C
It is used when both ores and impurities are magnetic in nature.
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D
It is used when either ore or impurities are magnetic in nature.
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Solution

The correct option is D It is used when either ore or impurities are magnetic in nature.
Magnetic separation is applicable when either the ore particles or the impurities are magnetic (attracted by a magnet) in nature. Magnets present in a rotor attracts magnetic particles forming a separate heap from non-magnetic particles.

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Q. Magnetic separation is used when both ore as well as impurities are magnetic in nature.
Q.

Magnetic separation method is only used when either of the two, the ore or the gangue, is magnetic.


Q. Complete the table given below.

Properties of
ores		Properties of the impurities
present in the ore		The method of
concentration
High density Low density ........................
Magnetic in nature Non-magnetic nature ........................
Lighter sulphide ores High density ........................
Aluminium ores that get
dissolved in a solution 		Insoluble in the same solution.......................
Q. Certain properties of metallic ores and the impurities present in them are given in the table. Identify the suitable method of concentration and complete the table.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Properties of ores​ Properties of the impurities
present in the ore​		 Method of concentration
High density​ Low density​
Magnetic in nature​ Non-magnetic nature​
Lighter sulphide ores ​ High density​
Aluminium ores that get
dissolved in solution​		 Insoluble in the same solution

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Q. Consider the following statements :
S1 : Hydraulic washing is not preferable if the ore and the impurities have similar specific gravities.
S2 : Magnetic separation cannot be used if the ore is non-magnetic in nature.
S3 : Collectors have hydrophobic and hydrophilic part they occupies the air water interface and entraps the particles.

The correct statement(s) among the ones given is/are
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