Which among the following is a false statement ?

Options

A. `SO_3` is obtained by the catalytic oxidation of `SO_2`
B. `SO_3` has trigonal planar geometry is gaseous state
C. `SO_3` in gaseous state has all S - O bonds equivalent
D. `SO_3` gas shows more solubility in water than in `H_2SO_4`

Answer

To determine which statement is false among the provided options regarding sulfur trioxide (SO3), we will analyze each statement step by step.

### Step 1: Analyze Option 1
**Statement:** SO3 is obtained by the catalytic oxidation of SO2.

**Analysis:**
This statement is true. The process of catalytic oxidation involves the reaction of sulfur dioxide (SO2) with oxygen (O2) to produce sulfur trioxide (SO3). The reaction can be represented as:
\[ 2 \, \text{SO}_2 + \text{O}_2 \xrightarrow{\text{catalyst}} 2 \, \text{SO}_3 \]

### Step 2: Analyze Option 2
**Statement:** SO3 has trigonal planar geometry in the gaseous state.

**Analysis:**
This statement is also true. The molecular geometry of SO3 is trigonal planar due to the arrangement of three oxygen atoms around the central sulfur atom. The hybridization of sulfur in SO3 is sp², leading to a trigonal planar shape.

### Step 3: Analyze Option 3
**Statement:** SO3 in the gaseous state has all SO bonds equivalent.

**Analysis:**
This statement is true. In the gaseous state, all three sulfur-oxygen (S-O) bonds in SO3 are equivalent due to resonance. The bond lengths are the same, and the structure can be represented as a resonance hybrid of multiple contributing structures.

### Step 4: Analyze Option 4
**Statement:** SO3 gas shows more solubility in water than in H2SO4.

**Analysis:**
This statement is false. SO3 does not dissolve directly in water; instead, it reacts exothermically with water to form sulfuric acid (H2SO4). The reaction is highly exothermic and can be dangerous. In contrast, SO3 is more soluble in concentrated sulfuric acid (H2SO4) than in water. Therefore, this statement is incorrect.

### Conclusion
The false statement among the given options is **Option 4**: SO3 gas shows more solubility in water than in H2SO4.

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