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Which of the following reactions is correct?

1. (NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O
2. Zn(ClO3)2 → ZnCl2 + 3O2
3. 2KClO3 → 2KCl + 3O2
4. 4K2Cr2O7 → 4K2CrO4 + 2Cr2O3 + 3O2

Correct answer: 2KClO3 → 2KCl + 3O2

Solution

The decomposition of potassium chlorate (KClO3) into potassium chloride (KCl) and oxygen (O2) is a well-known reaction and is correctly balanced as 2KClO3 → 2KCl + 3O2.

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