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?
- Hydrochloric acid (HCl)
- Ammonium chloride (NH4Cl) + Ammonium hydroxide (correct)
- Hydrogen sulphide (H2S) in basic medium
- Hydrogen sulphide (H2S) in acid medium
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?
- Co2+ and Ni2+
- Mn2+ and Ni2+
- Zn2+ and Co2+ (correct)
- Mn2+ and Zn2+
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?
- Hydrogen sulphide (H2S) in basic medium
- Ammonium chloride (NH4Cl) + Ammonium hydroxide
- NH4Cl + NH4OH + (NH4)2CO3 (correct)
- Hydrochloric acid (HCl)
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?
Which group of cations does not have a specific reagent for classification?
Which group of cations does not have a specific reagent for classification?
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?
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?
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?
Which group of cations has no specific reagent for classification?
Which group of cations has no specific reagent for classification?
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?
Match the following cation groups with their corresponding group reagents:
Match the following cation groups with their corresponding group reagents:
Match the following cation groups with their precipitated forms:
Match the following cation groups with their precipitated forms:
Match the following cation groups with the character of their precipitates:
Match the following cation groups with the character of their precipitates:
Match the following cations with the corresponding group reagent for their classification:
Match the following cations with the corresponding group reagent for their classification:
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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