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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Kp and Kc Relationship and Characteristics of K

  • question_answer
    \[{{A}_{(g)}}+3{{B}_{(g)}}\] ⇌\[4{{C}_{(g)}}\]. Starting concentration of A is equal to B, equilibrium concentration of A and C are same. \[{{K}_{c}}=\] [Kerala CET 2005]

    A)                 0.08       

    B)                 0.8

    C)                 8             

    D)                 80

    E)                 1/8

    Correct Answer: C

    Solution :

    A + 3B ⇌ 4C
    a b 0
    (a ? x) (b ? 3x) 4x
                       \[{{K}_{C}}=\frac{{{[C]}^{4}}}{[A]{{[B]}^{3}}}=\frac{4x.4x.4x.4x}{(a-x)(b-3x)}\]                    Given \[a=b,\,a-x=4x\Rightarrow a=5x=b\]                                 \[{{K}_{C}}=\frac{4x.4x.4x.4x}{(5x-x)(5x-3x)}=\frac{4x.4x.4x.4x}{4x.2x.2x.2x}=8\].


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