Of the above compounds, hydrochloric acid will not react only with phosphorus oxide.
1.2HCl + Zn = ZnCl2 + H2. Displacement of hydrogen and formation of chloride.
2.2HCl + Cu = CuCl2 + H2.
3.2HCl + Cu (OH) 2 = CuCl2 + 2H2O. Salt and water production.
4.2HCl + Na2S = H2S + 2NaCl. Formation of salt and hydrogen sulfide.
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