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Ionic Equilibrum question

2005 · Q114
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Ionic Equilibrum question

2005 · Q114

NEETChemistryIonic EquilibrumMCQ+4 / −1
H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because
  1. A
    presence of HCl decreases the sulphide ion concentration
  2. B
    solubility product of group II sulphides is more than that of group IV sulphates
  3. C
    presence of HCl increases the sulphide ion concentration
  4. D
    sulphides of group IV cations are unstable in HCl.
View written solutionFree

Correct answer: A

H2S ⇌ H+ + HS–

HCl ⇌ H+ + Cl–

In presence of HCl this ionization of H2S is suppressed due to the presence of extra H+ ions from HCl and produces less amount of sulphide ions due to common ion effect, thus HCl decreases the solubility of H2S which is sufficient to precipitate IInd group radicals.

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