Which of the following does not give oxygen on heating ? \( \mathrm{P} \) (A) \( \left(\mathrm{N...

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Which of the following does not give oxygen on heating ?
\( \mathrm{P} \)
(A) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
(B) \( \mathrm{KClO}_{3} \)
(C) \( \mathrm{Zn}\left(\mathrm{ClO}_{3}\right) 2 \)
(D) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
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