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Q. No.Hess's law states that:
1.
The heat evolved in a given process is equal to the heat absorbed in the reverse process.
2.
The heat evolved or absorbed in a chemical process is the same regardless of the pathway taken.
3.
The heat of reaction depends on the temperature of the reaction.
4.
The heat of reaction is directly proportional to the concentration of the reactants.
Subtopic: Calorimetry |
72%
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Hints
Which of the following is NOT a type of calorimeter?
1. Bomb calorimeter
2. Coffee-cup calorimeter
3. Differential scanning calorimeter
4. Electrochemical calorimeter
1. Bomb calorimeter
2. Coffee-cup calorimeter
3. Differential scanning calorimeter
4. Electrochemical calorimeter
Subtopic: Calorimetry |
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The heat capacity of a system is defined as:
| 1. | The heat required to raise the temperature of the system by 1 degree Celsius. |
| 2. | The heat released when the system undergoes a chemical reaction. |
| 3. | The heat absorbed when the system undergoes a chemical reaction. |
| 4. | The heat required to raise the temperature of the system by 1 Kelvin. |
Subtopic: Calorimetry |
71%
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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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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 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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Subtopic: Detection of Cations |
79%
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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 |
59%
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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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