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Which of the following is a sulphide ore? (a) Carnallite (b) Magnetite (c) Copper pyrites (d) Malachite

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Which of the following is a sulphide ore? 

(a) Carnallite 

(b) Magnetite 

(c) Copper pyrites 

(d) Malachite

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The correct option is (c) Copper pyrites.

Explanation:

Chemical formula for magnetite is Fe3O4 malachite is CuCO3.Cu(OH)2, carnallite is KCl.MgCl2.6H2O and copper pyrites is CuFeS2. Therefore, copper pyrites is a sulphide ore.

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