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Question

Consider the following ores.
Siderite, Iron Pyrites, Haematite, Malachite, Cuprite, Copper glance, Sphalerite, Calamine, Zincite.
Out of the above ores, x is the number of ores in which oxidation number of metal is 1. The value of 4x is:

A
8.0
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B
8.00
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C
8
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