What is the oxidation state of calcium in calcium carbonate (CaCO3)? (A) +6 (B) +5 (C) +4 (D) +1 (E) +2

Let the oxidation state of the calcium be X.

The overall change on the compound is zero

X + 1 x (+4) + 3 x (-2) = 0

X + 4 – 6 = 0

X – 2 = 0

X = +2

Therefore, the oxidation state of calcium in calcium carbonate (CaCO3) is +2

So, the correct option is (E)

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