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-1. In simple inorganic compounds other than peroxides and superoxides, oxygen almost always has an oxidation number of -2, but since calcium cations always have an oxidation number of +2, in this compound, the two oxygen atoms must have only -1 charge each. This compound is calcium peroxide, one of the exceptions noted above.

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12y ago
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15y ago

Mo is at an oxidation state of 5+ in CaMoO4 the oxidation state of Mo in CaMoO4 is 6+

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12y ago

It's 6, because: each oxygen is -2 (-2 x 4 = -8), but there is a -2 charge on the compound so the sum of the oxidation numbers of Mo and O has to be -2. So, +6 plus -8 equals -2.

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Q: What is the oxidation number of Mo in MoO42?
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