Question

Consider the following isomers.

(i) $\lbrack Pt(NH_{3})_{4}Cl_{2}\rbrack Br_{2}$

(ii) $\lbrack Pt(NH_{3})_{4}Br_{2}\rbrack Cl_{2}$

(iii) $\lbrack Co(NH_{3})_{4}Cl_{2}\rbrack NO_{2}$

Which of the following observations is correct?

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

Answer 1

Answer: (A)

(i) Will give a pale yellow and (ii) will give a white precipitate with $AgNO_{3}$solutions.

Answer 2

$\lbrack Pt(NH_{3})_{4}Cl_{2}\rbrack Br_{2} \rightarrow \lbrack Pt(NH_{3})_{4}Cl_{2}\rbrack^{2 +} + 2Br^{-}$

$Br^{-} + AgNO_{3} \rightarrow \underset{Paleyellow}{AgBr} + NO_{3}^{-}$

$\lbrack Pt(NH_{3})_{4}Br_{2}\rbrack Cl_{2} \rightarrow \lbrack Pt(NH_{3})_{4}Br_{2}\rbrack^{2 +} + 2Cl^{-}Cl^{-}AgNO_{3} \rightarrow \underset{White}{AgCl} + NO_{3}^{-}$