First slide

Applications of complexes

Question

The complex compound that gives a precipitate with BaCl₂ solution is

Easy

A

$[Co {({NH}_{3})}_{5} {SO}_{4}] Br$
B

$[Co {({NH}_{3})}_{5} Br] {SO}_{4}$
C

$[Co {({NH}_{3})}_{5} Br] {({NO}_{3})}_{2}$
D

$[Co {({NH}_{3})}_{5} {SO}_{4}] Cl$

Solution

$\begin{array}{l} Both {CO}_{3}^{- 2} and {SO}_{4}^{- 2} give a white ppt with {BaCl}_{2} \\ {SO}_{4}^{- 2} + {Ba}^{+ 2} \to {BaSO}_{4} (s) ↓ \\ {CO}_{3}^{- 2} + {Ba}^{+ 2} \to {BaCO}_{3} (s) ↓ \\ The complex, [Co {({NH}_{3})}_{5} Br] {SO}_{4} ionizes to {[Co {({NH}_{3})}_{5} Br]}^{+ 2}^{} and {SO}_{4}^{- 2} \\ Thus it gives white ppt with {BaCl}_{2} Solution . \end{array}$

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