ASSERTION: $C u F e S_{2}$ is concentrated by froth floatation method.
REASON: $C u F e S_{2}$ is the main ore of copper.

If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion

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If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion

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If assertion is CORRECT but reason is INCORRECT

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If assertion is INCORRECT but reason is CORRECT

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Solution

The correct option is B If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion
Chief ore of copper is copper pyrite ( $C u F e S_{2}$ ). It is a sulphide ore and sulphide ores are concentrated by froth flotation method.

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ASSERTION: CuFeS2 is concentrated by froth floatation method.REASON: CuFeS2 is the main ore of copper.

The correct option is B If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertionChief ore of copper is copper pyrite (CuFeS2). It is a sulphide ore and sulphide ores are concentrated by froth flotation method.

ASSERTION: $C u F e S_{2}$ is concentrated by froth floatation method.
REASON: $C u F e S_{2}$ is the main ore of copper.

The correct option is B If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion
Chief ore of copper is copper pyrite ( $C u F e S_{2}$ ). It is a sulphide ore and sulphide ores are concentrated by froth flotation method.