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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Sample Paper Topic Test - Chemical Equilibrium

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

    A) > 7.92

    B) < 7.92         

    C) equal to 7.92

    D) 0.822

    Correct Answer: B

    Solution :

    [b] \[{{K}_{p}}=p_{{{H}_{2}}O}^{2}=1.086\times {{10}^{-4}}\,at{{m}^{2}}\] \[{{p}_{{{H}_{2}}O}}=1.04\times {{10}^{-2}}\times 760=7.92\,\,\text{mm}\,\text{Hg}\] If the vapour pressure of water in air is less than 7.92 mm Hg, water of crystallization is given out.


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