下列各组物质中,\(\rm{X}\)是主体物质,\(\rm{Y}\)是少量杂质,\(\rm{Z}\)是为除去杂质所要加入的试剂,其中所加试剂正确的一组是\(\rm{(}\) \(\rm{)}\)
| \(\rm{A}\) | \(\rm{B}\) | \(\rm{C}\) | \(\rm{D}\) |
\(\rm{X}\) | \(\rm{FeCl_{2}}\)溶液 | \(\rm{FeCl_{2}}\)溶液 | \(\rm{Fe}\) | \(\rm{FeSO_{4}}\)溶液 |
\(\rm{Y}\) | \(\rm{FeCl_{3}}\) | \(\rm{CuCl_{2}}\) | \(\rm{Al}\) | \(\rm{Fe_{2}(SO_{4})_{3}}\) |
\(\rm{Z}\) | \(\rm{Cl_{2}}\) | \(\rm{Fe}\) | \(\rm{NaOH}\)溶液 | \(\rm{Cu}\) |