Choose the correct statement: a. metals having more chemical reactivity occur as native elements. b. removal of gangue from ores is called refining c. tin stone is concentrated by gravity separation d. silver glance is a carbonate ore.
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(c)Tin stone is concentrated by gravity separation.
The benefication of Cassiterite (tinstone) can be carried out by gravity separation and magnetic separation. The ore is crushed to a fine powder and concentrated by gravity separation by washing with current of water when most of the lighter gangue particles are removed.
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Option (b) removel Of gange particles from ore is known as refining
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