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Question

What is the oxidation state of calcium in calcium carbonateCaCO3?


A

+6

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B

+5

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C

+4

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D

+1

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E

+2

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Solution

The correct option is E

+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 CaCO3:

The oxidation state of Carbon(C) = +4

The oxidation state of Oxygen(O) = -2

Consider the oxidation state of Calcium(Ca) = x

Now,

x+1×+4+3×-2=0x+4-6=0x=+2

So, the oxidation number of Calcium in Calcium carbonate is +2.

Hence, option (E) is correct.


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