A solid, $T$, was added to an excess amount of the liquid $U$. A colourless gas was evolved and a white precipitate formed. The precipitate was not $T$. What might $T$ and $U$ be?
- A$T=\text{BaCO}_3,\ U=\text{H}_2\text{O}$
- B$T=\text{Ca},\ U=\text{dilute } \text{H}_2\text{SO}_4$
- C$T=\text{Mg},\ U=\text{dilute } \text{H}_2\text{SO}_4$
- D$T=\text{SrCO}_3,\ U=\text{dilute } \text{HCl}$