Which one of the following ore is not concentrated by froth floatation process?

Copper pyrites

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Galena

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Pyrolusite

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Zinc blende

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Solution

The correct option is C Pyrolusite
Generally, sulphide ores are concentrated by "Froth floatation" and apart from pyrolusite ( $M n O_{2}$ ), all are sulphide ores. So, pyrolusite is not concentrated by froth floatation process.

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The ore that is not concentrated by froth floatation is: