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Among the following statement the incorrect onr is (IIT -1997)

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Among the following statement the incorrect onr is (IIT -1997)
A. Calamine and siderite are carbonate
B. Argentite and cuprite are oxides
C. Zinc blande and pyrites are sulphide
D. Malachite and azurite are ores of copper
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Correct Answer - b
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