Q.

Find the number of native ores out of given ores. Pyrolusite, Chromite, Siderite, Cassiterite, Calamine, Argentite, Lime stone, Chalcopyrite.

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Detailed Solution

All the ores are in combined state. Hence no native ores. Only Gold and platinum is found in native form or its pure form.
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Find the number of native ores out of given ores. Pyrolusite, Chromite, Siderite, Cassiterite, Calamine, Argentite, Lime stone, Chalcopyrite.