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Cl(2)(g)rarr2Cl(g), In this process valu...

`Cl_(2)(g)rarr2Cl(g)`, In this process value of `Delta H` will be -

A

Positive

B

Negative

C

Zero

D

Nothing can be predicted

Text Solution

AI Generated Solution

The correct Answer is:
To determine the value of ΔH for the reaction \( \text{Cl}_2(g) \rightarrow 2\text{Cl}(g) \), we need to analyze the process in terms of bond energies and whether energy is absorbed or released. ### Step-by-Step Solution: 1. **Identify the Reaction**: The reaction given is \( \text{Cl}_2(g) \rightarrow 2\text{Cl}(g) \). This indicates that one molecule of chlorine gas (Cl2) dissociates into two chlorine atoms (Cl). 2. **Understand Bond Energy**: In the diatomic chlorine molecule (Cl2), there is a strong Cl-Cl bond. To break this bond and form two separate chlorine atoms, energy must be supplied to overcome the bond energy. 3. **Determine Energy Change (ΔH)**: - When a bond is broken, energy is absorbed. Therefore, the process of breaking the Cl-Cl bond requires energy input. - Since energy is absorbed in this reaction, the change in enthalpy (ΔH) for the reaction will be positive. 4. **Conclusion**: Based on the analysis, since energy is absorbed to break the bond in Cl2, the value of ΔH for the reaction \( \text{Cl}_2(g) \rightarrow 2\text{Cl}(g) \) is positive. ### Final Answer: The value of ΔH will be positive.
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Knowledge Check

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