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JCECE Medical JCECE Medical Solved Paper-2002

  • question_answer
    The chemical formula of potash alum is \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}x{{H}_{2}}O,\]here \[x\] is:

    A)  7              

    B)  12

    C)  6              

    D)  24

    Correct Answer: D

    Solution :

     Key Idea:General formula of alum is\[{{M}_{2}}S{{O}_{4}}.M{{}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] where M is monovalent metal ion M is trivalent metal ion         \[\therefore \]In \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.x{{H}_{2}}O,x=24\]


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