MCQ
The equilibrium constants for the reaction, $\text{Zn(s)}+\text{Cu}^{2+}(\text{aq})\rightleftharpoons\text{Zn}^{2+}(\text{aq})+\text{Cu}(\text{s})$ and
$\text{Cu(s)}+2\text{Ag}^+(\text{aq})\rightleftharpoons\text{Cu}^{2+}(\text{aq})+2\text{Ag(s)}$ are $\text{K}_1$ and $\text{K}_2$ respectively. The equilibrium constant for the combined reaction is,
  • $\text{K}_1\times\text{K}_2$
  • B
    $\text{K}_1+\text{K}_2$
  • C
    $\text{K}_1-\text{K}_2$
  • D
    $\frac{\text{K}_1}{\text{K}_2}$

Answer

Correct option: A.
$\text{K}_1\times\text{K}_2$
As we are combining the two equations.
$\therefore$ Equilibrium constant for combined reaction, i.e. $\text{K = K}_1 \times \text{K}_2$

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