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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Self Evaluation Test - Equilibrium

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

    A) >9.72mm         

    B) <7.92mm

    C) >7.92mm         

    D) < 11.92mm

    Correct Answer: B

    Solution :

    [b] The efflorescent salts loss water to atmosphere \[{{K}_{p}}=p_{{{H}_{2}}O}^{2}=1.086\times {{10}^{-4}};\] \[{{p}_{{{H}_{2}}O}}=1.042\times {{10}^{-2}}atm=7.92mm\] If \[{{H}_{2}}O\] pressure at \[25{}^\circ C\] is less than 7.92 mm. The reaction \[CuS{{O}_{4}}.5{{H}_{2}}O\left( s \right)\xrightarrow{{}}CuS{{O}_{4}}.3{{H}_{2}}O\left( s \right)+{{H}_{2}}O\left( g \right)\] will not proceed in RHS.


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