Podcast
Questions and Answers
Which group reagent is used for the classification of Fe3+, Cr3+, and Al3+ cations?
Which group reagent is used for the classification of Fe3+, Cr3+, and Al3+ cations?
Which cations are precipitated in the form of sulphides from an ammonical solution using NH4Cl + NH4OH + H2S?
Which cations are precipitated in the form of sulphides from an ammonical solution using NH4Cl + NH4OH + H2S?
Which reagent is used to precipitate CaCO3, BaCO3, and SrCO3 from a solution containing Ca2+, Ba2+, and Sr2+ cations?
Which reagent is used to precipitate CaCO3, BaCO3, and SrCO3 from a solution containing Ca2+, Ba2+, and Sr2+ cations?
Which group of cations has sparingly soluble hydroxides when treated with NH4Cl + NH4OH?
Which group of cations has sparingly soluble hydroxides when treated with NH4Cl + NH4OH?
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Which group of cations does not have a specific reagent for classification?
Which group of cations does not have a specific reagent for classification?
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Which group reagent is used for the classification of Fe3+, Cr3+, Al3+ cations?
Which group reagent is used for the classification of Fe3+, Cr3+, Al3+ cations?
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Which cations are precipitated in the form of sulphides from an ammonical solution using NH4Cl + NH4OH + H2S as the group reagent?
Which cations are precipitated in the form of sulphides from an ammonical solution using NH4Cl + NH4OH + H2S as the group reagent?
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Which group reagent is used for the classification of Ca2+, Ba2+, Sr2+ cations?
Which group reagent is used for the classification of Ca2+, Ba2+, Sr2+ cations?
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Which group of cations has no specific reagent for classification?
Which group of cations has no specific reagent for classification?
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Which cations are precipitated as sparingly soluble hydroxides using NH4Cl + NH4OH as the group reagent?
Which cations are precipitated as sparingly soluble hydroxides using NH4Cl + NH4OH as the group reagent?
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Match the following cation groups with their corresponding group reagents:
Match the following cation groups with their corresponding group reagents:
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Match the following cation groups with their precipitated forms:
Match the following cation groups with their precipitated forms:
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Match the following cation groups with the character of their precipitates:
Match the following cation groups with the character of their precipitates:
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Match the following cations with the corresponding group reagent for their classification:
Match the following cations with the corresponding group reagent for their classification:
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Match the following cations with the corresponding precipitated forms when treated with the group reagents:
Match the following cations with the corresponding precipitated forms when treated with the group reagents:
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Study Notes
Group Reagents for Cation Classification
- Group reagent for classification of Fe³⁺, Cr³⁺, and Al³⁺ cations: NH4Cl + NH4OH
- Ca²⁺, Ba²⁺, and Sr²⁺ cations are classified using the reagent: (NH4)2CO3.
Cations and Precipitation
- Cations precipitated as sulphides from an ammonical solution using NH4Cl, NH4OH, and H2S: Fe²⁺, Cu²⁺, and Ni²⁺.
- Sparingly soluble hydroxides formed with NH4Cl + NH4OH include: Fe(OH)₃, Cr(OH)₃, and Al(OH)₃.
Cation Groups without Specific Reagents
- No specific reagent for classification exists for alkali metal cations (Li⁺, Na⁺, K⁺, etc.).
Summary of Precitation Groups
- Group cations with sparingly soluble hydroxides using NH4Cl + NH4OH are: Al³⁺, Fe³⁺, and Cr³⁺.
Matching Cation Groups with Group Reagents and Precipitates
- Fe³⁺, Cr³⁺, Al³⁺: Group reagent - NH4Cl + NH4OH; Precipitate forms - Fe(OH)₃, Cr(OH)₃, Al(OH)₃.
- Ca²⁺, Ba²⁺, Sr²⁺: Group reagent - (NH4)2CO3; Precipitate forms - CaCO3, BaCO3, SrCO3.
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Description
Test your knowledge of qualitative analysis of cations with this quiz. Explore the classification of cations into six groups and the common reagents used for their separation. Challenge yourself with questions on the use of hydrochloric acid, hydrogen sulphide, ammonium chloride, and more in the analysis of cations.
