Question
In the Group analysis of cations, $\text{Ba}^{2+}$ & $\text{Ca}^{2+}$ are precipitated respectively as
The correct answer is
chromate & sulphide
Cation Analysis Precipitation: Ba2+ & Ca2+
In qualitative cation analysis, specific reagents are used to precipitate ions based on their group characteristics. The question asks for the precipitation forms of Barium ($\text{Ba}^{2+}$) and Calcium ($\text{Ca}^{2+}$) ions.
Precipitation Forms
- Barium Ion ($\text{Ba}^{2+}$): According to the context implied by the options, Barium ($\text{Ba}^{2+}$) is precipitated as Barium Chromate ($\text{BaCrO}_4$). This typically occurs in specific analytical schemes where chromate ions are used as a precipitating agent.
- Calcium Ion ($\text{Ca}^{2+}$): Similarly, Calcium ($\text{Ca}^{2+}$) is indicated to precipitate as a Sulphide. While Calcium doesn't typically form stable sulphides in aqueous solution under standard qualitative analysis conditions (it's often precipitated as $\text{CaCO}_3$), we follow the provided context.
Conclusion
Based on the provided correct answer, the precipitation forms are:
- $\text{Ba}^{2+}$ precipitates as Chromate ($\text{CrO}_4^{2-}$).
- $\text{Ca}^{2+}$ precipitates as Sulphide ($\text{S}^{2-}$).
Therefore, the correct option is the one listing chromate for $\text{Ba}^{2+}$ and sulphide for $\text{Ca}^{2+}$.
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