Which of the following statements is wrong ?

Options

A. `SO_2` dissolves in water and forms sulphurous acid
B. `SO_2` acts as a bleaching agent
C. `SO_2` has pungent odour
D. `SO_2` acts only as oxidising agent

Explanation

To determine which statement is wrong regarding sulfur dioxide (SO2), let's analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement:** SO2 dissolves in water and forms sulfuric acid.

**Analysis:** This statement is incorrect. When SO2 dissolves in water, it forms sulfurous acid (H2SO3), not sulfuric acid (H2SO4). Therefore, this statement is wrong.

### Step 2: Analyze Statement 2
**Statement:** SO2 acts as a bleaching agent.

**Analysis:** This statement is correct. SO2 can act as a bleaching agent by removing oxygen from colored substances, making them colorless. This is a temporary effect, but it is true.

### Step 3: Analyze Statement 3
**Statement:** SO2 has a pungent odor.

**Analysis:** This statement is also correct. SO2 is known for its strong, irritating, and pungent odor, which is easily detectable by humans.

### Step 4: Analyze Statement 4
**Statement:** SO2 acts only as an oxidizing agent.

**Analysis:** This statement is incorrect. While SO2 can act as an oxidizing agent, it can also act as a reducing agent. Sulfur in SO2 has a +4 oxidation state and can be further oxidized to +6, meaning it can lose electrons and reduce other substances. Therefore, this statement is wrong.

### Conclusion
The wrong statement among the provided options is the first statement: "SO2 dissolves in water and forms sulfuric acid."

### Final Answer
The wrong statement is: **SO2 dissolves in water and forms sulfuric acid.**

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