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ক্ষারীয় জিংক সালফেট (ZnSO₄) দ্রবণে হাইড্রোজেন সালফাইড (H₂S) যোগ করলে জিংক সালফাইডের (ZnS) সাদা অধঃক্ষেপ উৎপন্ন হয়।
ZnSO₄ + 2NaOH —–> Zn(OH)₂ + Na₂SO₄
Zn(OH)₂ + 2NaOH —–> Na₂ZnO₂ + 2H₂O
Na₂ZnO₂ + 2H₂S —-> ZnS + 2NaOH
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