Q15 / 160 · AP EAMCET 2021 (24 Aug Shift 2) · Chemistry

Which of the following statement is true when equilibrium is established in the reaction? $A+B \rightleftharpoons C+D, K_C=10$

  • A
    $[C][D]=[A][B]$
  • B
    $[C]=[A]$ and $[B]=[D]$
  • Correct answer
    C
    $[A][B]=0.1[C][D]$
  • D
    $[A]=[B]=[C]=[D]=10 \mathrm{M}$

Solution

$A+B \rightleftharpoons C+D$ Given, $K_C=10$ $K_C=\frac{[C][D]}{[A][B]}$ $\begin{aligned} & {[A][B]=\frac{1}{K_C}[C][D]} \\ & {[A][B]=\frac{1}{10}[C][D]} \\ & {[A][B]=0.1[C][D]}\end{aligned}$

Hence, the correct answer is option: 'C'.

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