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Which of the following does not give oxygen on heating ?

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Which of the following does not give oxygen on heating ?
A. `(NH_(4))_(2)Cr_(2)O_(7)`
B. `KClO_(3)`
C. `Zn(ClO_(3))_(2)`
D. `K_(2)Cr_(2)O_(7)`
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Correct Answer - A
`(NH_(4))_(2)Cr_(2)O_(7)` on heating does not give `O_(2)`
`(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)toCr_(2)O_(3)+N_(2)+H_(2)O`
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