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When potassium chlorate (KClO3) is heated with a small amount of manganese dioxide (MnO2) as a catalyst, a gas W is released. If W is allowed to react with white phosphorus, it produces a compound X. Upon treating X with concentrated nitric acid (HNO3), two products Y and Z are formed. What are Y and Z, respectively?

1. Dinitrogen pentoxide (N2O5) and metaphosphoric acid (HPO3)
2. Dinitrogen tetroxide (N2O4) and metaphosphoric acid (HPO3)
3. Dinitrogen pentoxide (N2O5) and orthophosphoric acid (H3PO4)
4. Dinitrogen trioxide (N2O3) and orthophosphoric acid (H3PO4)

Correct answer: Dinitrogen pentoxide (N2O5) and metaphosphoric acid (HPO3)

Solution

Potassium chlorate heated with manganese dioxide produces oxygen gas, which reacts with white phosphorus to form tetraphosphorus decaoxide. This compound then reacts with concentrated nitric acid to produce dinitrogen pentoxide and metaphosphoric acid.

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