Your question is not clear: probable you think to alloys (gold-copper), mixtures of gases (hydrogen-nitrogen) etc.
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Yes, a mixture may consist of elements and compounds. A mixture is formed when two or more substances are physically combined without forming a new substance, so it can contain elements and compounds in various proportions.
Lime is a compound.
It is a element
No, it is a compound, not a mixture. Its formula is MgO, and it contains Magnesium and Oxygen (two fairly common elements).
Reactants can be a mixture, compounds, a mixture of compounds and also elements. It depends on the reaction. Air is a mixture and is often a reactant for example.