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AMU Medical AMU Solved Paper-2008

  • question_answer
    A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame test and a yellow precipitate with potassium chromate the salt is

    A)  \[NiS{{O}_{4}}\]                              

    B)  \[Ba{{S}_{2}}{{O}_{3}}\]

    C)  \[Pb{{S}_{2}}{{O}_{3}}\]                              

    D)  \[CuS{{O}_{4}}\]

    Correct Answer: B

    Solution :

                     Since, the salt on treatment with dil. HCl gives a pungent smelling gas \[(S{{O}_{2}})\] and a yellow ppt., it must contain \[{{S}_{2}}O_{3}^{2-}\] (thiosulphate ion) and further since it gives green flame test, it must contain \[B{{a}^{2+}}\] ion. Therefore, salt is\[Ba{{S}_{2}}{{O}_{3}}\].


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