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Question

Oxidation number of chlorine(Cl) atoms in HClO4​ and HClO3​ molecules are :

A
+6 and +5
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B
+7 and 1
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C
+7 and +5
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D
+7 and 5
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Solution

The correct option is C +7 and +5
Let the oxidation state of chlorine be x an y in HClO4​ and HClO3​.
The oxidation number of H and O atoms in both HClO4​ and HClO3​ are +1 and 2 respectively.

HClO4:
Let the oxidation number of Cl is x
+1+x×(8)=0x=81x=+7

HClO3:
Let the oxidation number of Cl is y
+1+y×(6)=0y=61y=+5.

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