Which of the following complex will give white precipitate with barium chloride solution?

• Correct answer
  A

  $\left[\mathrm{C}\mathrm{r}\right(\mathrm{N}{\mathrm{H}}_3{)}_5\mathrm{C}\mathrm{l}]\mathrm{S}{\mathrm{O}}_4$
• B

  $\left[\mathrm{C}\mathrm{r}\right(\mathrm{N}{\mathrm{H}}_3\left)\mathrm{S}{\mathrm{O}}_4\right]\mathrm{C}\mathrm{l}$
• C

  $\left[\mathrm{C}\mathrm{o}\right(\mathrm{N}{\mathrm{H}}_3{)}_6]\mathrm{B}{\mathrm{r}}_3$
• D

  None of these

Hence, the correct answer is option: 'A'.