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Question

Ores are usually contaminated with earthly or undesired materials known as

A
Gangue
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B
Dust
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C
Slag
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D
Lime
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Solution

The correct option is A Gangue
It is rare for a ore to contain only desired product. It is usually contaminated with earthly or undesired materials known as Gangue.
Example: Silica (SiO2)

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