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JEE Main & Advanced JEE Main Paper Phase-I (Held on 09-1-2020 Evening)

  • question_answer
    The first and second ionisation enthalpies of a metal are 496 and \[4560\,kJ\,\,mo{{l}^{-1}},\]respectively. How many moles of \[HCl\] and \[{{H}_{2}}S{{O}_{4}},\]respectively, will be needed to react completely with 1 mole of the metal hydroxide? [JEE MAIN Held on 09-01-2020 Evening]

    A) 2 and \[0.5\]

    B) 1 and 2

    C) 1 and \[0.5\]

    D) 1 and 1

    Correct Answer: C

    Solution :

    From the given ionisation enthalpy data it can be concluded that valency of the given metal is one. \[\therefore \]     Its hydroxide is MOH \[\underset{1\,\,mol}{\mathop{MOH}}\,+\underset{1\,\,mol}{\mathop{HCl}}\,\xrightarrow{{}}MCl+{{H}_{2}}O\] \[\underset{1\,\,mol}{\mathop{MOH}}\,+\underset{1/2\,\,mol}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,\xrightarrow{{}}{{M}_{2}}S{{O}_{4}}+{{H}_{2}}O\]


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