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Q. No.Which of the following anions can be detected using dilute \(\mathrm{H}_ 2 \mathrm{SO}_ 4\)?
1. \(\mathrm{Cl}^{-}\)
2. \(\mathrm{CO}_3{ }^{2-}\)
3. \( \mathrm{OH}^{-} \)
4. \( \mathrm{PO}_4{ }^{3-}\)
Subtopic: Detection of Anions |
75%
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What is the group reagent used for the precipitation of group II basic radicals in qualitative analysis?
1. \(\mathrm { Dilute } ~\mathrm{HCl}\)
2. \(\mathrm{Dilute }~ \mathrm{HCl}+\mathrm{H} _2 \mathrm{S} \)
3. \( \mathrm{Dilute~ H_{2}SO_{4} }\)
4. \(\mathrm { Dilute } ~\mathrm{NH}_{ 4} \mathrm{OH}\)
1. \(\mathrm { Dilute } ~\mathrm{HCl}\)
2. \(\mathrm{Dilute }~ \mathrm{HCl}+\mathrm{H} _2 \mathrm{S} \)
3. \( \mathrm{Dilute~ H_{2}SO_{4} }\)
4. \(\mathrm { Dilute } ~\mathrm{NH}_{ 4} \mathrm{OH}\)
Subtopic: Detection of Cations |
87%
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Which indicator is commonly used in the titration of Mohr's salt with potassium permanganate?
1. Phenolphthalein
2. Methyl orange
3. Starch
4. None of the above
1. Phenolphthalein
2. Methyl orange
3. Starch
4. None of the above
Subtopic: The chemistry involved in the titrimetric exercises |
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In the titration of oxalic acid with \(\mathrm{KMnO_4}\), what is the role of oxalic acid?
1. Oxidizing agent
2. Reducing agent
3. Indicator
4. Catalyst
1. Oxidizing agent
2. Reducing agent
3. Indicator
4. Catalyst
Subtopic: The chemistry involved in the titrimetric exercises |
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Which acid is typically used for the preparation of standard solution of KMnO4?
1. Sulphuric acid
2. Hydrochloric acid
3. Phosphoric acid
4. Oxalic acid
1. Sulphuric acid
2. Hydrochloric acid
3. Phosphoric acid
4. Oxalic acid
Subtopic: The chemistry involved in the titrimetric exercises |
57%
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What is the heat of neutralization for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?
1. -57.32 kJ/mol
2. -13.7 kJ/mol
3. -57.32 kJ/g
4. -13.7 kJ/g
1. -57.32 kJ/mol
2. -13.7 kJ/mol
3. -57.32 kJ/g
4. -13.7 kJ/g
Subtopic: Calorimetry |
76%
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Which of the following statements about exothermic reactions is true?
1. They absorb heat from the surroundings
2. They have a positive change in enthalpy \((\Delta \mathrm{H})\)
3. They release heat to the surroundings
4. They occur spontaneously at low temperatures
1. They absorb heat from the surroundings
2. They have a positive change in enthalpy \((\Delta \mathrm{H})\)
3. They release heat to the surroundings
4. They occur spontaneously at low temperatures
Subtopic: Calorimetry |
80%
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The heat of vaporization is the heat:
1. Absorbed when a solid changes to a liquid.
2. Released when a gas changes to a liquid.
3. Absorbed when a liquid changes to a gas.
4. Released when a liquid changes to a solid
1. Absorbed when a solid changes to a liquid.
2. Released when a gas changes to a liquid.
3. Absorbed when a liquid changes to a gas.
4. Released when a liquid changes to a solid
Subtopic: Calorimetry |
81%
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Subtopic: Calorimetry |
84%
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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 |
71%
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