Which of the following statements about acids and bases is correct?
- AA $0.1\,\text{mol dm}^{-3}$ solution of ethanoic acid has a higher pH than a $0.1\,\text{mol dm}^{-3}$ solution of hydrochloric acid.
- BAll bases dissolve in water to produce $\text{OH}^-$ ions.
- CBases react with nitrates to produce ammonia.
- DOxides of metals are always acidic in character.