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Which of the following cannot be concentrated by electromagnetic separation?

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in Chemistry – Class 12 by (188k points)
Which of the following cannot be concentrated by electromagnetic separation?

(a) Chromite

(b) Magnetite

(c) Pyrolusite

(d) Zinc blende

I had been asked this question in class test.

This intriguing question originated from Concentration of Ores topic in division General Principles and Processes of Isolation of Elements of Chemistry – Class 12

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Correct answer is (d) Zinc blende

Explanation: Electromagnetic separation is used to concentrate an ore when either the particles of the ore or the impurities present in it are magnetic in nature. Chromite, magnetite and pyrolusite have magnetic nature and are separated from their non-magnetic gangue particles using this method. Zinc blende is concentrated using electrostatic separation or froth floatation.

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