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.