Potassium was fused with sulfur. The resulting salt was treated with hydrochloric acid. The gas released during this process

Potassium was fused with sulfur. The resulting salt was treated with hydrochloric acid. The gas released during this process was passed through a solution of potassium dichromate in sulfuric acid. The precipitated yellow substance was filtered off and fused with aluminum. Write the equations for the described reactions.

2K + S → K2S
K2S + 2HCl → H2S↑ + 2KCl
3H2S + K2Cr2O7 + 4H2SO4 → 3S↓ + Cr2(SO4)3 + K2SO4 + 7H2O
3S + 2Al → Al2S3

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