NEET Exam > NEET Questions > Which of the following is not correct?a)Diss...
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Which of the following is not correct?
- a)Dissolution of NH4Cl in excess of water is an endothermic process
- b)Neutralisation process is always exothermic
- c)The absolute value of enthalpy (H) can be determined experimentally
- d)The heat of reaction at constant volume is denoted by ΔE
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which of the following is not correct?a)Dissolution of NH4Cl in exces...
Explanation:
The correct answer is option 'C' - The absolute value of enthalpy (H) can be determined experimentally.
Enthalpy (H):
Enthalpy is a thermodynamic property that represents the heat content of a system. It is denoted by the symbol 'H'. Enthalpy change (ΔH) is the change in heat content during a chemical reaction or a physical process.
Dissolution of NH4Cl:
The dissolution of NH4Cl in water is an endothermic process. When NH4Cl dissolves in water, it absorbs heat from the surroundings, causing a decrease in temperature. This is because breaking the ionic bonds between NH4+ and Cl- requires an input of energy.
Neutralisation process:
The neutralization process refers to the reaction between an acid and a base to form a salt and water. It is generally exothermic, meaning it releases heat to the surroundings. This is because the formation of new bonds between the ions in the salt and the water molecules releases energy.
Heat of reaction at constant volume:
The heat of reaction at constant volume is denoted by ΔE. It represents the change in internal energy of a system during a chemical reaction or a physical process that occurs at constant volume. It is different from enthalpy change (ΔH) because it does not account for the work done by or on the system due to changes in pressure.
Determining enthalpy experimentally:
The absolute value of enthalpy (H) cannot be determined experimentally. What can be determined experimentally is the change in enthalpy (ΔH) during a reaction or a process. The enthalpy change can be measured using calorimetry, which involves measuring the heat exchanged between the system and the surroundings.
In conclusion, the statement that is not correct is option 'C' - The absolute value of enthalpy (H) can be determined experimentally. Enthalpy change (ΔH) can be determined experimentally, but the absolute value of enthalpy itself cannot be directly measured.
The correct answer is option 'C' - The absolute value of enthalpy (H) can be determined experimentally.
Enthalpy (H):
Enthalpy is a thermodynamic property that represents the heat content of a system. It is denoted by the symbol 'H'. Enthalpy change (ΔH) is the change in heat content during a chemical reaction or a physical process.
Dissolution of NH4Cl:
The dissolution of NH4Cl in water is an endothermic process. When NH4Cl dissolves in water, it absorbs heat from the surroundings, causing a decrease in temperature. This is because breaking the ionic bonds between NH4+ and Cl- requires an input of energy.
Neutralisation process:
The neutralization process refers to the reaction between an acid and a base to form a salt and water. It is generally exothermic, meaning it releases heat to the surroundings. This is because the formation of new bonds between the ions in the salt and the water molecules releases energy.
Heat of reaction at constant volume:
The heat of reaction at constant volume is denoted by ΔE. It represents the change in internal energy of a system during a chemical reaction or a physical process that occurs at constant volume. It is different from enthalpy change (ΔH) because it does not account for the work done by or on the system due to changes in pressure.
Determining enthalpy experimentally:
The absolute value of enthalpy (H) cannot be determined experimentally. What can be determined experimentally is the change in enthalpy (ΔH) during a reaction or a process. The enthalpy change can be measured using calorimetry, which involves measuring the heat exchanged between the system and the surroundings.
In conclusion, the statement that is not correct is option 'C' - The absolute value of enthalpy (H) can be determined experimentally. Enthalpy change (ΔH) can be determined experimentally, but the absolute value of enthalpy itself cannot be directly measured.
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Which of the following is not correct?a)Dissolution of NH4Cl in exces...
The absolute value of enthalpy cannot be determined, only the change in enthalpy (ΔH) during a process can be determined.
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Which of the following is not correct?a)Dissolution of NH4Cl in excess of water is an endothermic processb)Neutralisation process is always exothermicc)The absolute value of enthalpy (H) can be determined experimentallyd)The heat of reaction at constant volume is denoted by ΔECorrect answer is option 'C'. Can you explain this answer?
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