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JEE Main & Advanced Sample Paper JEE Main Sample Paper-32

  • question_answer
    For the equilibrium, \[CuS{{O}_{4}}.5{{H}_{2}}O(s)\rightleftharpoons CuS{{O}_{4}}.3{{H}_{2}}O(s)+2{{H}_{2}}O(g),{{K}_{p}}=1.086\times {{10}^{-4}}\] at \[{{25}^{o}}C\]. The efflorescent nature of \[CuS{{O}_{4}}.5{{H}_{2}}O(s)\] can be noticed when the vapour pressure of water in the atmosphere is (in mm Hg):

    A) \[10.92\]             

    B)    \[7.90\]

    C) \[<7.90\]

    D)                    \[>7.90\]

    Correct Answer: C

    Solution :

    \[Kp=P_{{{H}_{2}}O}^{2}=1.086\,\times {{10}^{-4}}at{{m}^{2}}\] \[{{P}_{{{H}_{2}}O}}\,=1.04\,\times {{10}^{-2}}\,\times 760\,=7.90\,mm\,Hg\]


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