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How many of the following will give O(2)...

How many of the following will give `O_(2)` on heating ?
`KMnO_(4),K_(2)Cr_(2)O_(7),ZnO,Na_(2)O,`
`PbO_(2),Pb_(3)O_(4),Pb(NO_(3))_(2),NH_(4)NO_(3)`

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