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Which of the following does not give oxygen on heating?

1. Zn(ClO3)2
2. K2Cr2O7
3. (NH4)2Cr2O7
4. KClO3

Correct answer: K2Cr2O7

Solution

K2Cr2O7 does not release oxygen upon heating; instead, it decomposes to form Cr2O3, K2CrO4, and water. The other compounds release oxygen during thermal decomposition.

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