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Q)

# Oxygen evolves on heating

$(a)\;BaO_2\qquad(b)\;CaO_2\qquad(c)\;SrO_2\qquad(d)\;All$

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A)
Oxygen evolves on heating $BaO_2,CaO_2$ and $SrO_2$
Hence (d) is the correct answer.