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Question

Oxidation number of potassium in K2O,K2O2,KO2 respectively, are :

A
+2,+1 and+12
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B
+1,+1 and+1
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C
+1,+4 and+2
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D
+1,+2 and+4
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Solution

The correct option is B +1,+1 and+1
Potassium is an element which belongs to alkali metal group. All alkali metals show only one oxidation state,i.e., +1. Therefore, potassium in all its oxides shows +1 oxidation state. This can also be shown as,
Oxidation number in +1K22O

Hence, oxidation number of Potassium in K2O is +1

Oxidation number in +1K21O2

Hence, O.N. of Potassium in K2O2 is +1

O.N.in )+1K0.5O2

Hence, O.N of K in KO2 is+1)


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