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When potassium chlorate is heated with a small amount of manganese dioxide as a catalyst, a gas W is produced. When W is in excess, it reacts with white phosphorus to form compound X. Upon treating X with concentrated nitric acid, compounds Y and Z are formed. What are W and X, respectively?

1. Ozone and tetraphosphorus decaoxide
2. Oxygen and tetraphosphorus hexoxide
3. Oxygen and tetraphosphorus decaoxide
4. Ozone and tetraphosphorus hexoxide

Correct answer: Oxygen and tetraphosphorus decaoxide

Solution

The gas W produced by heating potassium chlorate with manganese dioxide is oxygen, which then reacts with white phosphorus to form tetraphosphorus decaoxide, denoted as X.

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