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Q. No.What is the purpose of the borax bead test?
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
Subtopic: Detection of extra elements |
81%
Level 1: 80%+
Hints
What is the role of borax (sodium borate) in the borax bead test?
1. It acts as a flux to facilitate the formation of a bead.
2. It acts as an indicator for pH changes.
3. It reacts with metal ions to form colored complexes.
4. It stabilizes the flame during heating.
1. It acts as a flux to facilitate the formation of a bead.
2. It acts as an indicator for pH changes.
3. It reacts with metal ions to form colored complexes.
4. It stabilizes the flame during heating.
Subtopic: Detection of extra elements |
Level 3: 35%-60%
Hints
The borax bead test is responded by.
1. Bivalent metals
2. Trivalent metals
3. Light metals
4. Metals which form colored metaborates
1. Bivalent metals
2. Trivalent metals
3. Light metals
4. Metals which form colored metaborates
Subtopic: Detection of extra elements |
86%
Level 1: 80%+
Hints
What ion is inferred when a violet sublimate forms along the test tube's interior after adding 1 mL of a salt solution neutralized with HCl, followed by 1 mL of carbon disulfide, and subsequently adding an excess of chlorine water drop by drop and shaking the test tube?
1. \(Cl^-\)
2. \(I^-\)
3. \(SO_4^{2-}\)
4. \(CO_3^{2-}\)
1. \(Cl^-\)
2. \(I^-\)
3. \(SO_4^{2-}\)
4. \(CO_3^{2-}\)
Subtopic: Detection of Anions |
81%
Level 1: 80%+
Hints
What is the product when sodium iodide reacts with concentrated sulphuric acid?
1. \(\mathrm{Na}_2\mathrm{SO}_4\)
2. \(\mathrm{H_2}\)
3. \(\mathrm{NaHSO}_4\)
4. \(\mathrm{NaI}\)
1. \(\mathrm{Na}_2\mathrm{SO}_4\)
2. \(\mathrm{H_2}\)
3. \(\mathrm{NaHSO}_4\)
4. \(\mathrm{NaI}\)
Subtopic: Detection of Anions |
59%
Level 3: 35%-60%
Hints
What is the color of the solution formed due to the reaction between
the given salt containing NO3- ion and concentrated H2SO4 with copper turnings?
1. Yellow
2. Brown
3. Blue
4. Colourless
the given salt containing NO3- ion and concentrated H2SO4 with copper turnings?
1. Yellow
2. Brown
3. Blue
4. Colourless
Subtopic: Detection of Anions |
Level 4: Below 35%
Hints
1 mL of an aqueous salt solution is heated with 2 mL of concentrated sulfuric acid. It is then cooled and then mixed with a freshly prepared ferrous sulfate solution. What will form as a result of this steps?
| 1. | Brown precipitate | 2. | Dark brown ring |
| 3. | White precipitate | 4. | Green solution |
Subtopic: Detection of Anions |
68%
Level 2: 60%+
Hints
Which acid is used to acidify the solution before adding barium chloride to test for sulphate ions?
1. Sulphuric acid
2. Hydrochloric acid
3. Nitric acid
4. Acetic acid
1. Sulphuric acid
2. Hydrochloric acid
3. Nitric acid
4. Acetic acid
Subtopic: Detection of Anions |
Level 3: 35%-60%
Hints
Lead sulphate is insoluble in which solution?
1. Hydrochloric acid
2. Nitric acid
3. Acetic acid
4. Water
1. Hydrochloric acid
2. Nitric acid
3. Acetic acid
4. Water
Subtopic: Detection of Anions |
55%
Level 3: 35%-60%
Hints
What happens when barium chloride is added to an acidic solution containing sulphate ions?
1. Formation of a white precipitate of barium sulphate
2. Formation of a yellow precipitate of barium chloride
3. Formation of a blue precipitate of barium acetate
4. No reaction occurs
1. Formation of a white precipitate of barium sulphate
2. Formation of a yellow precipitate of barium chloride
3. Formation of a blue precipitate of barium acetate
4. No reaction occurs
Subtopic: Detection of Anions |
83%
Level 1: 80%+
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