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Which of the following componds does not evolve oxygen when heated alone ?

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Which of the following componds does not evolve oxygen when heated alone ?
A. `KClO_3`
B. `KMnO_4`
C. `NH_4 NO_2`
D. `KNO_3`
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Correct Answer - C
`NH_4 NO_2 overset(Delta) rarr N_2 + 2H_2 O`
`2 KClO_3 overset(Delta) rarr 2 KCl + 3O_2`
`2 KMnO_4 overset(Delta) rarr K_2 MnO_4 + MnO_2 + O_2`
`2 KNO_3 overset(Delta) rarr 2 KNO_2 + O_2`.
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