Write the reaction equation: Cr2 (SO4) 3- Cr (OH) 3- Cr2O3- Cr- Cr2S3

1) Cr2 (SO4) 3 + 6KOH = 2Cr (OH) 3 + 3K2SO4 (when chromium sulfate reacts with potassium hydroxide, chromium hydroxide and potassium sulfate are formed);

2) 2Cr (OH) 3 = Cr2O3 + 3H2O (when heated, chromium hydroxide decomposes into chromium oxide and water);

3) Cr2O3 + 3Si = 4Cr + 3SiO2 (when chromium oxide interacts with silicon, chromium and silicon dioxide are formed);

4) 2Cr + 3S = Cr2S3 (when chromium reacts with sulfur, chromium sulfide is formed).

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