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A: Delta H is positive for endothermic r...

A: `Delta H` is positive for endothermic reactions.
R : If total enthalpies of reactants and products are `H_(R) & H_(P)` respectively then for an endothermic reaction `H_(R) lt H_(P)`

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 (A) and the reason (R) provided. ### Step 1: Understand the Assertion The assertion states that ΔH (change in enthalpy) is positive for endothermic reactions. - **Explanation**: In an endothermic reaction, the system absorbs heat from the surroundings. This means that the energy of the products is higher than that of the reactants, leading to a positive change in enthalpy. ### Step 2: Understand the Reason The reason states that if the total enthalpies of the reactants and products are H_R and H_P respectively, then for an endothermic reaction, H_R < H_P. - **Explanation**: For an endothermic reaction, the enthalpy of the products (H_P) must be greater than the enthalpy of the reactants (H_R). This is because the reaction absorbs energy, resulting in a higher energy state for the products compared to the reactants. ### Step 3: Relate Assertion and Reason Now, we can relate the assertion and the reason mathematically: - The change in enthalpy (ΔH) is defined as: \[ ΔH = H_P - H_R \] - For ΔH to be positive (indicating an endothermic reaction), it must be true that: \[ H_P > H_R \] - This directly supports the reason provided. ### Conclusion Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, we can conclude that the correct answer is: **Both assertion and reason are true, and the reason is the correct explanation of the assertion.**
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Knowledge Check

  • Assertion : In the proces, H_(2(g)) rarr 2H_((g)) .entropy increases. Reason : Breaking of bonds is an endothermic process.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

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