For `2 SO_(2) + O_(2) hArr 2SO_(3). Delta ` H = - Q KJ. as per Lechatelier's principle which of the following changes favours forward reaction, yielding more `SO_(3)`
(A) Adding more `O_(2) " "`(B) Removing `SO_(3)" "`(C) Applying high P `" "` (D) Change of catalyst

Options

A. A, B, C & D
B. A, B & D
C. A & D
D. A, B & C

Answer

To determine which changes favor the forward reaction \(2 SO_2 + O_2 \rightleftharpoons 2 SO_3\) according to Le Chatelier's principle, we will analyze each option step by step.

### Step 1: Understand the Reaction
The given reaction is:
\[ 2 SO_2 + O_2 \rightleftharpoons 2 SO_3 \]
This reaction is exothermic, as indicated by \(\Delta H = -Q\) (heat is released).

### Step 2: Analyze Each Option

#### Option A: Adding More \(O_2\)
- **Effect**: According to Le Chatelier's principle, adding more reactants shifts the equilibrium to the right (forward reaction) to produce more products.
- **Conclusion**: This change favors the formation of \(SO_3\).

#### Option B: Removing \(SO_3\)
- **Effect**: Removing a product will also shift the equilibrium to the right to replace the removed product.
- **Conclusion**: This change favors the formation of \(SO_3\).

#### Option C: Applying High Pressure
- **Effect**: Increasing the pressure favors the side of the reaction with fewer moles of gas. In this case, the left side has 3 moles (2 from \(SO_2\) and 1 from \(O_2\)) and the right side has 2 moles (\(2 SO_3\)). Therefore, increasing pressure will shift the equilibrium to the right.
- **Conclusion**: This change favors the formation of \(SO_3\).

#### Option D: Change of Catalyst
- **Effect**: A catalyst speeds up both the forward and reverse reactions equally but does not change the position of equilibrium.
- **Conclusion**: This change does not favor the formation of \(SO_3\).

### Final Conclusion
The changes that favor the forward reaction yielding more \(SO_3\) are:
- **Option A**: Adding more \(O_2\)
- **Option B**: Removing \(SO_3\)
- **Option C**: Applying high pressure

**Correct Options**: A, B, and C.