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NEET Chemistry Equilibrium / साम्यावस्था NEET PYQ-Ionic Equilibrium

  • question_answer
    \[{{H}_{2}}S\] 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:             [AIPMT (S) 2005]

    A)        presence of HCl decreases the sulphide ion concentration

    B)       presence of HCl increases the sulphide ion concentration

    C)       solubility product of group II sulphides is more than that of group IV sulphides

    D)       sulphides of group IV cations are unstable in HCl

    Correct Answer: B

    Solution :

    In qualitative analysis of cation of   second group H2S gas is passed in presence of HCl, of sulphide ions is obtained which is sufficient for the precipitation of second group cations in form of their sulphides due to lower value of their solubility product (Ksp). Here, fourth group cations are not precipicated because they require for exceeding their ionic product to their solubility products and higher sulphide ions concentration due to their higher Ksp which is not obtained here due to common ion effect.


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