`K_(p)` for an endothermic chemical reaction is `10` atm. Then backward reaction is favoured at

Options

A. High pressure, high temperature
B. High pressure, low temperature
C. Low pressure, high temperature
D. Low pressure, low temperature

Explanation

To determine the conditions under which the backward reaction is favored for an endothermic reaction with a given \( K_p \) value of 10 atm, we can follow these steps:

### Step 1: Understand the nature of the reaction
- We are dealing with an endothermic reaction. In endothermic reactions, heat is absorbed, and the reaction can be represented as:
\[ \text{Reactants} + \text{Heat} \rightleftharpoons \text{Products} \]

### Step 2: Apply Le Chatelier's Principle
- According to Le Chatelier's Principle, if we change the conditions of a reaction at equilibrium, the system will adjust to counteract that change.
- For an endothermic reaction, increasing the temperature will favor the forward reaction (towards products), while decreasing the temperature will favor the backward reaction (towards reactants).

### Step 3: Analyze the effect of temperature
- Since we want to favor the backward reaction, we need to decrease the temperature. Therefore, low temperature conditions will favor the backward reaction.

### Step 4: Analyze the effect of pressure
- The effect of pressure on the equilibrium depends on the number of moles of gas on each side of the reaction.
- If the number of moles of products is greater than the number of moles of reactants, increasing pressure will favor the backward reaction.
- Conversely, if the number of moles of reactants is greater than that of products, increasing pressure will favor the forward reaction.

### Step 5: Determine the implications of \( K_p \)
- Given that \( K_p = 10 \) atm, we can infer that the equilibrium lies towards the products side. This suggests that the number of moles of products is greater than that of reactants.
- Therefore, increasing pressure will favor the backward reaction.

### Conclusion
- To favor the backward reaction for the given endothermic reaction with \( K_p = 10 \) atm, we need to apply low temperature and high pressure conditions.

### Final Answer
- The backward reaction is favored at **low temperature and high pressure**.

---