Oxidation number of chlorine(Cl) atoms in HClO4 and HClO3 molecules are :
A
+6and+5
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B
+7and−1
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C
+7and+5
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D
+7and−5
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Solution
The correct option is C+7and+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 Clisx +1+x×(−8)=0x=8−1x=+7
HClO3:
Let the oxidation number of Clisy +1+y×(−6)=0y=6−1y=+5.