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A: Total enthalpy change of a multistep ...

A: Total enthalpy change of a multistep process is sum of ` Delta H_(1) + Delta H_(2) + Delta H_(3) + ....`
R: When heat is absorbed by the system, the sign of q is taken to be negative.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)

B

If both Assertion & Reason are true and the reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion is true statement but Reason is false, then mark (3)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: The assertion states that the total enthalpy change of a multistep process is the sum of the enthalpy changes of each step, i.e., \[ \Delta H_{\text{total}} = \Delta H_1 + \Delta H_2 + \Delta H_3 + \ldots \] This is a statement of Hess's Law, which states that the total enthalpy change for a reaction is the same, regardless of the number of steps taken to achieve that reaction. **Hint**: Recall Hess's Law, which allows us to calculate the total enthalpy change by summing the enthalpy changes of individual steps. 2. **Understanding the Reason**: The reason states that when heat is absorbed by the system, the sign of \( q \) (heat) is taken to be negative. This is incorrect. When heat is absorbed by the system, \( q \) is considered positive. Conversely, when heat is released by the system, \( q \) is negative. **Hint**: Remember the convention for heat transfer: heat absorbed by the system is positive, while heat released is negative. 3. **Evaluating the Truth of Each Statement**: - The assertion is **true** because it correctly describes Hess's Law. - The reason is **false** because it incorrectly states the sign convention for heat absorbed by the system. 4. **Conclusion**: Since the assertion is true and the reason is false, the correct answer is that the assertion is true but the reason is false. **Final Answer**: Assertion is true, Reason is false.
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