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Pyrolusite is

$ (a)\;\text{an oxide ore} \\(b)\;\text{a sulphide ore.} \\(c)\;\text{a carbide ore} \\ (d)\;\text{not an ore} $
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Pyrolusite is an important oxide ore of manganese.
Hence a is the correct answer.
answered Mar 18, 2014 by meena.p

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