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Q.

The ores that can be concentrated by froth floatation method are

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a

copper pyrites

b

zinc blende

c

pyrolusite

d

siderite

answer is A.

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Detailed Solution

Only sulphide ores are concentrated by froth floatation method and copper pyrites (CuFeS2) and Zinc blende (ZnS) are sulphide ores. Pyrolusite (MnO2) is an oxide ore and siderite (FeCO3) is a carbonate ore.
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