Explain the effect of concentration on equilibrium using the following experiment:
$Fe^{3+}_{(aq)} + SCN^{-}_{(aq)} \rightleftharpoons [Fe(SCN)]^{2+}_{(aq)}$
(Yellow) (Colourless) (Deep red)

  • A
    Addition of $Fe^{3+}$ shifts the equilibrium to the right,increasing red color intensity.
  • B
    Addition of $SCN^{-}$ shifts the equilibrium to the right,increasing red color intensity.
  • C
    Both $(A)$ and $(B)$ are correct.
  • D
    Addition of $HgCl_2$ shifts the equilibrium to the right.

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