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Questions and Answers
The sample may contain ______ ions, indicated by a blue color.
The sample may contain ______ ions, indicated by a blue color.
Cu2+
A green color in the sample suggests the presence of ______ or Cu2+ ions.
A green color in the sample suggests the presence of ______ or Cu2+ ions.
Ni2+
A ______ flame during the flame test indicates the presence of Ba2+ ions.
A ______ flame during the flame test indicates the presence of Ba2+ ions.
pale green
The presence of CO32— ion is confirmed by the evolution of a ______ gas when treated with dilute HCl.
The presence of CO32— ion is confirmed by the evolution of a ______ gas when treated with dilute HCl.
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When treated with concentrated H2SO4, the presence of ______ ion is detected by dense white fumes.
When treated with concentrated H2SO4, the presence of ______ ion is detected by dense white fumes.
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The presence of ______ ions is indicated by a brick red flame during the flame test.
The presence of ______ ions is indicated by a brick red flame during the flame test.
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The reddish brown gas evolved on boiling a mixture with copper turnings indicates the presence of ______ ions.
The reddish brown gas evolved on boiling a mixture with copper turnings indicates the presence of ______ ions.
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Nessler’s reagent test should be conducted only after identifying the presence of ______ ion using NaOH test.
Nessler’s reagent test should be conducted only after identifying the presence of ______ ion using NaOH test.
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Only Green or Blue salts will give black precipitate with ______ gas.
Only Green or Blue salts will give black precipitate with ______ gas.
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Sodium Bismuthate solution shows tendency to settle as it is sparingly soluble in ______.
Sodium Bismuthate solution shows tendency to settle as it is sparingly soluble in ______.
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If the sample does not dissolve in distilled water, the true solution made should be properly ______ as per the instruction given.
If the sample does not dissolve in distilled water, the true solution made should be properly ______ as per the instruction given.
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The second confirmatory test for Ni2+ ion may fail if ______ water used is weak.
The second confirmatory test for Ni2+ ion may fail if ______ water used is weak.
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To one part of the diluted salt solution, K4[Fe(CN)6] solution is added to confirm the presence of ______ ion.
To one part of the diluted salt solution, K4[Fe(CN)6] solution is added to confirm the presence of ______ ion.
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To 2nd part of the diluted salt solution, KCNS solution is added to confirm the presence of ______ ion.
To 2nd part of the diluted salt solution, KCNS solution is added to confirm the presence of ______ ion.
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To one portion of the sample solution, NaOH is added to confirm the presence of ______ ion.
To one portion of the sample solution, NaOH is added to confirm the presence of ______ ion.
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To the sample solution, K4[Fe(CN)6] solution is added and a greenish/bluish white precipitate confirms the presence of ______ ion.
To the sample solution, K4[Fe(CN)6] solution is added and a greenish/bluish white precipitate confirms the presence of ______ ion.
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To one portion of the sample solution, NaOH is added, resulting in the formation of a white precipitate that confirms the presence of ______ ion.
To one portion of the sample solution, NaOH is added, resulting in the formation of a white precipitate that confirms the presence of ______ ion.
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A purple color formed upon addition of HNO3, which changes to brown on adding sodium bismuthate confirms the presence of ______ ion.
A purple color formed upon addition of HNO3, which changes to brown on adding sodium bismuthate confirms the presence of ______ ion.
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To one portion of the sample solution, dimethyl glyoxime reagent is added to confirm the presence of ______ ion.
To one portion of the sample solution, dimethyl glyoxime reagent is added to confirm the presence of ______ ion.
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All salts containing nickel are characterized by their ______ color.
All salts containing nickel are characterized by their ______ color.
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Cool this solution and then add 2 drops of ______ and a few drops of K4[Fe(CN)6]
Cool this solution and then add 2 drops of ______ and a few drops of K4[Fe(CN)6]
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The given sample has: - Cation: ______, anion: ……….……………….and the salt is …....…………………..
The given sample has: - Cation: ______, anion: ……….……………….and the salt is …....…………………..
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If the medium is ______ or alkaline, the test fails.
If the medium is ______ or alkaline, the test fails.
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Always record the analysis in a ______ form.
Always record the analysis in a ______ form.
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Some ______ salts show sparking flame when a flame test is conducted.
Some ______ salts show sparking flame when a flame test is conducted.
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Whenever solubility of a ______ formed is tested, a small amount should be transferred to another test tube.
Whenever solubility of a ______ formed is tested, a small amount should be transferred to another test tube.
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AgCl will not give a clear transparent solution with excess of ______ when chloride ion is detected with Cu2+ or Mn2+ ions.
AgCl will not give a clear transparent solution with excess of ______ when chloride ion is detected with Cu2+ or Mn2+ ions.
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Hot concentrated reagents should not be thrown into ______.
Hot concentrated reagents should not be thrown into ______.
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Lime water turns milky in the presence of ______ ion.
Lime water turns milky in the presence of ______ ion.
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To confirm the presence of Cl— ion, AgNO3 solution is used to form a ______ precipitate.
To confirm the presence of Cl— ion, AgNO3 solution is used to form a ______ precipitate.
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The confirmatory test for nitrate ion involves adding freshly prepared ______ solution.
The confirmatory test for nitrate ion involves adding freshly prepared ______ solution.
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A thin dark brown ring forms at the junction between the reaction mixture and ______ acid.
A thin dark brown ring forms at the junction between the reaction mixture and ______ acid.
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The presence of SO42— ion is confirmed by the formation of a white precipitate of ______.
The presence of SO42— ion is confirmed by the formation of a white precipitate of ______.
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When testing for sulfate ions, an aqueous solution is acidified with dil.______.
When testing for sulfate ions, an aqueous solution is acidified with dil.______.
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An aqueous solution of the sample is treated with dilute acetic acid and ______ acetate for sulfate ion confirmation.
An aqueous solution of the sample is treated with dilute acetic acid and ______ acetate for sulfate ion confirmation.
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A white precipitate formed when adding lead acetate in an acidified solution indicates the presence of ______ ion.
A white precipitate formed when adding lead acetate in an acidified solution indicates the presence of ______ ion.
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The smell of ______ indicates the presence of NH4+ ion.
The smell of ______ indicates the presence of NH4+ ion.
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Agitating a solid salt sample with NaOH solution produces dense white ______ when NH4+ is confirmed.
Agitating a solid salt sample with NaOH solution produces dense white ______ when NH4+ is confirmed.
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A brown precipitate forms when the solid salt sample is treated with ______ followed by Nessler’s reagent.
A brown precipitate forms when the solid salt sample is treated with ______ followed by Nessler’s reagent.
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To prepare a true solution of the salt, start with a pinch of sample and ______ of solvent.
To prepare a true solution of the salt, start with a pinch of sample and ______ of solvent.
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The presence of group – I cations is indicated by a white precipitate of ______ when treated with dil. HCl.
The presence of group – I cations is indicated by a white precipitate of ______ when treated with dil. HCl.
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Passing H2S gas through the solution produces a black precipitate of ______, which shows the presence of group – II cations.
Passing H2S gas through the solution produces a black precipitate of ______, which shows the presence of group – II cations.
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To test for aluminum ions, gelatinous white precipitate of ______ is observed when adding NH4Cl solution.
To test for aluminum ions, gelatinous white precipitate of ______ is observed when adding NH4Cl solution.
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If the sample is insoluble in water, it can be attempted to be dissolved in dil.______ or dil. HNO3.
If the sample is insoluble in water, it can be attempted to be dissolved in dil.______ or dil. HNO3.
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Study Notes
Qualitative Analysis of Inorganic Salts
- Aim: To identify anions and cations in a given salt sample.
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Preliminary Examination:
- Color: Note the color of the sample.
- Flame Test: Prepare a paste of the sample in concentrated HCl. Observe the color of the flame when the paste is held in a Bunsen burner flame. The results provide clues about the presence or absence of transition metal cations.
Anion Analysis
- Carbonate (CO₃²⁻): Treat a small amount of sample with dilute HCl; if bubbles form (effervescence) and colorless, odorless gas (CO₂) is evolved, it indicates CO₃²⁻ ions.
- Chloride (Cl⁻): Treat the sample with concentrated H₂SO₄; if pungent, white fumes form, and they turn dense white when the mouth of a NH₄OH bottle is held near the test tube, this indicates the presence of chloride ions.
- Nitrate (NO₃⁻): Treat the sample solution with dil. H₂SO₄, freshly prepared FeSO₄ solution, and then gradually add concentrated H₂SO₄ down the inside of the tube. A dark brown ring forms at the junction of the two solutions, indicating the presence of NO₃⁻ ions.
- Sulphate (SO₄²⁻): Acidify the sample solution with dilute HCl, then add BaCl₂ solution. If a white precipitate (BaSO₄) forms, which is insoluble in concentrated HCl, it suggests the presence of SO₄²⁻ ions.
Cation Analysis
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Group 1: Treat the sample solution with dil. HNO₃ followed by AgNO₃ solution.
- A thick curd-like white precipitate (AgCl) forms, which dissolves in excess NH₄OH, indicates Cl⁻ ions.
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Group 2: Add H₂S gas to the above solution.
- Black precipitate (CuS), indicates the presence Cu²⁺ ions
- A black precipitate, indicates the presence of other Group II cations.
- Group 3-IV & V: Use various tests (adding specific reagents, observation of color changes, precipitates, etc.) to identify specific cations.
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Description
This quiz focuses on the qualitative analysis of inorganic salts, specifically on identifying various anions and cations through different tests. You will explore methods such as flame tests and chemical reactions to detect the presence of ions like carbonates, chlorides, and nitrates. Test your knowledge and understanding of these concepts!
