Q. Find number of ores in which metal is in oxidation state
Calamine, Galena, Dolomite, Cinnabar, Anglesite, Cerrusite, Argentite, Malachite, Siderite, Cassiterite
Give your answer as integer.

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Answer: 8

Solution:

In all the ores metal in except in (Argentite) metal is in and in Cassiterite is in .