Identify the incorrect statement.

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(B) For option $A$: An octadecapeptide consists of $18$ amino acid residues linked by $17$ peptide bonds. This statement is correct.For option $B$: Ad

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Addition of an inert gas into a system in thermodynamic equilibrium for the dissociation of $PCl_5$ at constant volume does not shift the equilibrium.

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(B) For option $A$: An octadecapeptide consists of $18$ amino acid residues linked by $17$ peptide bonds. This statement is correct.For option $B$: Addition of an inert gas at constant volume does not change the partial pressures of the reactants or products,so the equilibrium does not shift. The original statement claiming it shifts to the left is incorrect.For option $C$: Gold dissolves in aqua regia $(HCl + HNO_3)$ to form chloroauric acid $(HAuCl_4)$. This statement is correct.For option $D$: The relationship between $pH$ and $[H^{+}]$ is $[H^{+}] = 10^{-pH}$. If $pH$ changes from $5$ to $3$,the concentration changes by a factor of $10^{(5-3)} = 10^2 = 100$. This statement is correct.

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