Question

Assertion: $[Co(NH_{3})_{5}Br]SO_{4}$ gives white precipitate with barium chloride.
Reason: The complex $[Co(NH_{3})_{5}Br]SO_{4}$ dissociates in the solution to give $Br^{-}$ and $SO^{2-}_{4}$.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (C)

The complex $[Co(NH_{3})_{5}Br]SO_{4}$ dissociates to give $[Co(NH_{3})_{5}Br]^{2-}$ and $SO^{2-}_{4}$ ions. $SO^{2-}_{4}$ ion reacts with barium chloride to give white ppt. of $BaSO_{4}$.
$SO^{2-}_{4} +BaCl_{2} \to BaSO_{4}+2Cl^{-}$