QJEEM22Ch7a40: JEE Main 2022 Chemistry - Class 12 JEEM22Ch7a40 Solution: Correct formula of the compound which gives a white precipitate …

Question

Verified Solution • 2025–26 Session moderate

Correct formula of the compound which gives a white precipitate with BaCl₂ solution, but not with AgNO₃ solution, is :

Accepted Answer

Only the counter ions are replaced easily by other reagents.

\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}+\mathrm{BaCl}_{2} \rightarrow\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{Cl}_{2}+\underset{\text{White ppt.}}{\mathrm{BaSO}_{4}{\downarrow}}

White ppt. It does not have chloride ion as counter ion so it will not give white ppt with

\mathrm{AgNO}_{3}

.

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