At $27^{\circ} C$,the degree of dissociation of $HA$ (weak acid) in $0.5 \ M$ of its solution is $1 \%$. The concentrations of $H_3O^{+}$,$A^{-}$,and $HA$ at equilibrium (in $mol \ L^{-1}$) are respectively
- A$0.005, 0.005, 0.495$
- B$0.05, 0.05, 0.45$
- C$0.01, 0.01, 0.49$
- D$0.005, 0.495, 0.005$
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