JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Law of equilibrium and Equilibrium constant

  • question_answer
    At a certain temp. 2HI ⇌ H2 + I2 Only 50% HI is dissociated at equilibrium. The equilibrium constant is [DCE 1999]

    A)                 0.25       

    B)                 1.0

    C)                 3.0         

    D)                 0.50

    Correct Answer: A

    Solution :

             \[\underset{50}{\mathop{\underset{100}{\mathop{2HI}}\,}}\,\]⇌ \[\underset{25}{\mathop{\underset{0}{\mathop{{{H}_{2}}}}\,\,}}\,+\underset{25}{\mathop{\underset{0}{\mathop{{{I}_{2}}}}\,}}\,\]                                 \[\frac{[{{H}_{2}}]\,\,[{{I}_{2}}]}{{{[HI]}^{2}}}=\frac{25\times 25}{50\times 50}=0.25\].


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