JEE Main
- Exam
- JEE Main
- Subject
- Chemistry
- Chapter
- Practical Chemistry
JEE Main · Chemistry · Practical Chemistry
An aqueous solution contains a mixture of Fe^ 3+ and Mn^ 2+ ions....
An aqueous solution contains a mixture of and ions. To this solution, solid is added followed by an excess of , resulting in the formation of Precipitate A. The mixture is filtered, and gas is passed through the filtrate, which leads to the formation of Precipitate B. The colors of Precipitate A and Precipitate B, respectively, are:
Options
- AReddish-brown and Black
- BWhite and Buff
- CGreen and White
- DReddish-brown and Buff
Correct answer
D. Reddish-brown and Buff
Step-by-step solution
The separation of cations in qualitative analysis is based on the sequential use of group reagents. The addition of in the presence of is the group reagent for Group III cations.
In the given mixture, belongs to Group III and precipitates as iron(III) hydroxide, . This precipitate has a characteristic reddish-brown color, which identifies Precipitate A.
The filtrate contains the ions, which belong to Group IV. When gas is passed through this alkaline filtrate, manganese(II) precipitates as manganese(II) sulphide, . The characteristic color of is buff (flesh-colored), which identifies Precipitate B.
Therefore, the colors of Precipitate A and Precipitate B are reddish-brown and buff, respectively.
Answer: Reddish-brown and Buff
In the given mixture, belongs to Group III and precipitates as iron(III) hydroxide, . This precipitate has a characteristic reddish-brown color, which identifies Precipitate A.
The filtrate contains the ions, which belong to Group IV. When gas is passed through this alkaline filtrate, manganese(II) precipitates as manganese(II) sulphide, . The characteristic color of is buff (flesh-colored), which identifies Precipitate B.
Therefore, the colors of Precipitate A and Precipitate B are reddish-brown and buff, respectively.
Answer: Reddish-brown and Buff