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JCECE Engineering JCECE Engineering Solved Paper-2002

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

    A) \[7\]            

    B) \[12\]

    C) \[6\]                                     

    D)  \[24\]

    Correct Answer: D

    Solution :

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


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