Question

The best explanation for the solubility of MnS in dilute HCl is that :

• A. Solubility product of MnCl2 is less than that of MnS
• B. Concentration of Mn2+ is lowered by the formation of complex ions with chloride ions
• C. Concentration of sulphide ions is lowered by oxidation to free sulphur
• D. Concentration of sulphide ions is lowered by formation of weak acid H2S

Answer 1

Answer: (D)

Concentration of sulphide ions is lowered by formation of weak acid H2S

Answer 2

MnS(s) $\rightleftharpoons$ Mn2+ (aq) + S2– (aq) ; S2– (aq) + 2H+ (aq) $\rightleftharpoons$ H2S (aq)