Option (b) is correct because the change in entropy Along with suitable change in enthalpy decides the fate of a reaction either it is spontaneous or non-spontaneous reaction .

Change in entropy and enthalpy in a chemical reaction

Introduction:
In a chemical reaction, the reactants are converted into products. This conversion involves changes in both energy and disorder of the system. The energy change is represented by enthalpy, while the disorder change is represented by entropy.

Entropy:
Entropy is a measure of the randomness or disorder of a system. It is denoted by the symbol 'S'. In a chemical reaction, the entropy change (∆S) can be positive, negative, or zero.

Enthalpy:
Enthalpy is a measure of the heat energy absorbed or released during a chemical reaction. It is denoted by the symbol 'H'. In a chemical reaction, the enthalpy change (∆H) can be positive or negative.

The correct statement:
The correct statement from the options given is option 'B': The change in entropy along with a suitable change in enthalpy decides the fate of a reaction.

Explanation:
The fate of a chemical reaction, whether it will proceed or not, is determined by the change in entropy (∆S) along with a suitable change in enthalpy (∆H). Let's understand this in more detail:

1. Entropy change (∆S):
- If the entropy change (∆S) is positive, it indicates an increase in disorder or randomness of the system. This means that the products have higher disorder than the reactants.
- If the entropy change (∆S) is negative, it indicates a decrease in disorder or randomness of the system. This means that the products have lower disorder than the reactants.
- If the entropy change (∆S) is zero, it indicates no change in disorder or randomness of the system.

2. Enthalpy change (∆H):
- If the enthalpy change (∆H) is negative, it indicates an exothermic reaction, where heat is released to the surroundings.
- If the enthalpy change (∆H) is positive, it indicates an endothermic reaction, where heat is absorbed from the surroundings.

Fate of a reaction:
The fate of a reaction depends on the interplay between the entropy change (∆S) and the enthalpy change (∆H). Some possible scenarios are:

1. Favorable reaction:
- If the entropy change (∆S) is positive (increasing disorder) and the enthalpy change (∆H) is negative (exothermic), the reaction is likely to be spontaneous and proceed in the forward direction.
- This is because the products have higher disorder and lower energy compared to the reactants.

2. Unfavorable reaction:
- If the entropy change (∆S) is negative (decreasing disorder) and the enthalpy change (∆H) is positive (endothermic), the reaction is unlikely to proceed spontaneously.
- This is because the products have lower disorder and higher energy compared to the reactants.

3. Temperature dependence:
- The temperature also plays a crucial role in determining the fate of a reaction.
- Even if a reaction is unfavorable at lower temperatures, increasing the temperature can make it favorable by providing enough energy for the reaction to occur.

Conclusion:
In a chemical reaction, both the change in entropy (∆S) and the change in enthalpy (∆H)