What is the oxidation state of calcium in calcium carbonate?
+2
Explanation:
Oxidation number: Oxidation number denotes the oxidation state of an element in a compound ascertained according to a set of rules formulated on the basis that electron pair in a covalent bond belongs entirely to a more electronegative element.
Calculating the oxidation number of Calcium(Ca) in Calcium carbonate :
The oxidation state of Carbon(C) = +4
The oxidation state of Oxygen(O) = -2
Consider the oxidation state of Calcium(Ca) = x
Now,
So, the oxidation number of Calcium in Calcium carbonate is .
Hence, option (E) is correct.