Potassium nitrate was thermally decomposed. The released gas was passed in the light through a saturated solution

Potassium nitrate was thermally decomposed. The released gas was passed in the light through a saturated solution of hydrogen sulfide in water. The precipitated yellow substance was fused with iron, and the resulting salt was treated with dilute hydrochloric acid. Write the equations for the described reactions.

2KNO3 → 2KNO2 + O2↑
2H2S + O2 → 2S + 2H2O
S + Fe → FeS
FeS + 2HCl → FeCl2 + H2S↑

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