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How many of the following liberate O(2) ...

How many of the following liberate `O_(2)` on heating in a dry test tube ?
`CaO, Fe_(2)O_(3), Fe_(3)O_(4), FeO, Cr_(2)O_(3), XeF_(4), Al_(2)O_(3), MgO, Na_(2)O`

Text Solution

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The correct Answer is:
`04.5`
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