Q.

The non existing compound is

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a

KO

b

KO2

c

K2O

d

K2O2

answer is A.

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Detailed Solution

"K" on strong heating with oxygen gives only 3-types of oxides, with formula M2O , M2O2 , & MO21) Normal oxide K2O2) Peroxide K2O23) Super oxide KO2But can't form oxide with formula MO[KO]
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The non existing compound is