Nickel oxide is a solid.
Cuprous oxide or copper(I) oxide. This is copper in oxidation state '1'.
-2 oxidation state
Al O2
No such compound exists. If it did it would be iron VI oxide, but iron cannot reach such a high oxidation state. Perhaps you mean Fe2O3, iron III oxide.
Mercuric oxide is in the solid state.
Nickel oxide is a solid.
Cuprous oxide or copper(I) oxide. This is copper in oxidation state '1'.
In solid state, Aluminium and oxide ions are immobile. When aluminum oxide is melt down,aluminum and oxide ions become free and they can easily migrate to respecve electrodes. Therefore, aluminum oxide is electrolysed in molten state.
solid
Powder.
In CuO the oxidation state of Cu is +2 and is called cupric oxide, or copper-II oxide (do NOT pronounce as dioxide).In Cu2O the oxidation state of Cu is +1 and is called cuprous oxide, or copper I oxide or di-copper oxide.
-2 oxidation state
Ice.
Sodium oxide is a soft solid at room temperature.
No, Hematite is basically iron oxide in a mineral state, rust is another state of iron oxide. It can be polished to a luster resembling the look of steel
Plumbic oxide, is Lead (IV) oxide. It has the formula of PbO2, which is neutral. However if you wanted to know the oxidation state of the lead, then it is +4.