Question

Consider the following isomers.
(i) $[Pt (NH_{3})_{4}Cl_{2}]Br_{2}$
(ii) $[Pt(NH_{3})_{4} Br_{2}] Cl_{2}$
(iii) $[Co(NH_{3})_{4}Cl_{2}] NO_{2}$
Which of the following observations is correct?

• A. (i) will give a pale yellow and (ii) will give a white precipitate with $AgNO_{3}$ solution
• B. (iii) will give a white precipitate with $AgNO_{3}$ solution
• C. (i), (ii) and (iii) will give white precipitate with $AgNO_{3}$ solution
• D. None of the above isomers will give white precipitate with $AgNO_{3}$ solution

Answer 1

Answer: (A)

$\left[Pt\left(NH_{3}\right)_{4} Cl_{2}\right]Br_{2} \rightarrow\left[Pt\left(NH_{3}\right)_{4}Cl_{2}\right]^{2+}+2Br^{-}$
$Br^{-}+AgNO_{3}\rightarrow \underset{\text{pale yellow}}{{AgBr}}+NO^{-}_{3} $
$[Pt(NH_{3})_{4}Br_{2}] Cl_{2} \to [Pt(NH_{3})_{4}BR_{2}]^{2+}+2Cl^{-}$
$Cl^{-}+AgNO_{3} \to \underset{\text{white}}{{AgCl}}+NO^{-}_{3} $