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Q. No.Subtopic: Detection of Cations |
80%
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When manganese ions are treated with ammonium carbonate and ammonium hydroxide, what color precipitate is formed?
1. White
2. Brown
3. Green
4. Pink
1. White
2. Brown
3. Green
4. Pink
Subtopic: Detection of Cations |
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Which of the following complex ions is formed when manganese ions react with excess ammonia in aqueous solution?
1. \([Mn(NH_3)_6]^{2+}\)
2. \([Mn(NH_3)_4]^{2+}\)
3. \([Mn(NH_3)_6]^{3+}\)
4. \([Mn(NH_3)_4]^{3+}\)
1. \([Mn(NH_3)_6]^{2+}\)
2. \([Mn(NH_3)_4]^{2+}\)
3. \([Mn(NH_3)_6]^{3+}\)
4. \([Mn(NH_3)_4]^{3+}\)
Subtopic: Detection of Cations |
60%
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What is the color of the flame produced when a salt containing Ba ions is heated on a platinum
wire in a Bunsen burner flame?
1. Yellow-green
2. Red
3. Grassy green
4. Purple
wire in a Bunsen burner flame?
1. Yellow-green
2. Red
3. Grassy green
4. Purple
Subtopic: Detection of Cations |
53%
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What are the resultant changes when a solution containing barium ions undergoes treatment with dilute sulfuric acid, subsequent heating, and the addition of ammonium hydroxide?
1. Formation of a white precipitate.
2. Formation of a brown precipitate.
3. Solution turns red.
4. Solution turns green.
1. Formation of a white precipitate.
2. Formation of a brown precipitate.
3. Solution turns red.
4. Solution turns green.
Subtopic: Detection of Cations |
72%
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How can cobalt ions be distinguished from nickel ions in salt analysis?
| 1. | Cobalt ions form a pink precipitate with ammonia, while nickel ions form a green precipitate. |
| 2. | Cobalt ions form a blue precipitate with sodium hydroxide, while nickel ions form a green precipitate. |
| 3. | Cobalt ions react with potassium ferrocyanide to form a blue precipitate, while nickel ions do not. |
| 4. | Cobalt ions form a red-brown precipitate with potassium iodide, while nickel ions do not react. |
Subtopic: Detection of Cations |
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Which complex ion is formed when cobalt ions react with ammonia in the presence of chloride ions?
1. \([Co(NH_3)_6]^{3+}\)
2. \([Co(NH_3)_6]^{2+}\)
3. \([CoCl(NH_3)_5]^{4+}\)
4. \([Co(NH_3)_5Cl]^{2+}\)
1. \([Co(NH_3)_6]^{3+}\)
2. \([Co(NH_3)_6]^{2+}\)
3. \([CoCl(NH_3)_5]^{4+}\)
4. \([Co(NH_3)_5Cl]^{2+}\)
Subtopic: Detection of Cations |
56%
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What is the chemical formula of the complex formed when \(\mathrm{Hg}^{2+}\) ions react with excess potassium iodide?
1. \(\mathrm{Hgl}\)
2. \(\mathrm{Hgl}_ 2\)
3. \(\mathrm{Hgl}_3^{-}\)
4. \(\mathrm{HgI}_ 4^{ 2-}\)
1. \(\mathrm{Hgl}\)
2. \(\mathrm{Hgl}_ 2\)
3. \(\mathrm{Hgl}_3^{-}\)
4. \(\mathrm{HgI}_ 4^{ 2-}\)
Subtopic: Detection of Cations |
66%
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Which of the following is a confirmatory test for the presence of \(\mathrm{Hg}^{ 2+}\) ions in salt analysis?
| 1. | Formation of yellow precipitate with sodium carbonate. |
| 2. | Formation of brown precipitate with hydrochloric acid. |
| 3. | Formation of white precipitate with ammonium hydroxide. |
| 4. | Formation of red precipitate with potassium iodide. |
Subtopic: Detection of Cations |
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What is the color change observed during the titration of Mohr's salt with potassium permanganate?
1. From blue to colourless
2. From pink to colourless
3. From green to brown
4. From yellow to pink
1. From blue to colourless
2. From pink to colourless
3. From green to brown
4. From yellow to pink
Subtopic: The chemistry involved in the titrimetric exercises |
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