Question

What is the Oxidation state of chlorine in perchloric acid ?

Answer 1

HClO4

The oxidation state of Chlorine in perchloric acid = +7

Answer 2

The oxidation state of chlorine in perchloric acid is +7.

Explanation:

• To find the oxidation state, the molecular formula of the given compound must be written. Accordingly, the molecular formula of perchloric acid is $HClO_4$.
• As per the general rule for calculation of oxidation state,

1. As perchloric acid is a neutral compound, all the oxidation number of elements present in it must be equal to zero.
2. As hydrogen is attached with non-metal such as chlorine and oxygen, it carries +1 oxidation state.
3. The oxidation state of oxygen is always -2.

• Using the above point, the calculation for the oxidation state of chlorine in perchloric acid is as follows:

Let the oxidation state of chlorine be 'X'

$H + Cl + 4(O)$ = 0

1 + X + 4(-2) = 0

1 + X + (-8) = 0

-7 + X = 0

X = 7

• Thus the oxidation state of chlorine in perchloric acid is calculated as +7.

Learn more about oxidation state

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