1. CuCl₂ + 2NaOH = 2NaCl + Cu(OH)₂↓
2. H₂S + 2NaOH = Na₂S + 2H₂O
3. HCl + NaOH = NaCl + H₂O
4. CuCl₂ + H₂S = CuS↓ + 2HCl
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Answers & Comments
1. CuCl₂ + 2NaOH = 2NaCl + Cu(OH)₂↓
2. H₂S + 2NaOH = Na₂S + 2H₂O
3. HCl + NaOH = NaCl + H₂O
4. CuCl₂ + H₂S = CuS↓ + 2HCl