Which of the following statements is incorrect ?

Options

A. `C(s)+H_(2)O(g) hArr CO(g)+H_(2)(g)`
B. `H_(2)O(g)+I_(2)(g)hArr 2HI(g)`
C. `4NH_(3)(g)+5O_(2)(g)hArr 4NO(g)+6H_(2)O(l)`
D. `3O_(2)(g) hArr 2O_(3)(g)`

Explanation

To determine which statement is incorrect among the given options, we will analyze each reaction step by step.

### Step 1: Analyze the First Option
- **Reaction**: C (s) + H2O (g) ⇌ CO (g) + H2 (g)
- **Analysis**: This reaction describes the gasification of carbon (solid) with steam (water vapor) to produce carbon monoxide and hydrogen gas. This is a well-known reaction in metallurgy and is balanced.
- **Conclusion**: This statement is **correct**.

### Step 2: Analyze the Second Option
- **Reaction**: H2O (g) + I2 (s) ⇌ 2 HI (g)
- **Analysis**: This reaction suggests that water vapor and iodine solid produce two moles of hydrogen iodide. However, the correct stoichiometry for the reaction between water and iodine is:
- H2O (g) + I2 (s) ⇌ 2 HI (g)
- This reaction does not proceed as stated; typically, it forms only one mole of HI.
- **Conclusion**: This statement is **incorrect**.

### Step 3: Analyze the Third Option
- **Reaction**: 4 NH3 (g) + 5 H2O (g) ⇌ 4 NO (g) + 6 H2O (g)
- **Analysis**: This reaction describes the oxidation of ammonia to produce nitrogen monoxide and water. This is a known redox reaction where ammonia is oxidized, and it is balanced.
- **Conclusion**: This statement is **correct**.

### Step 4: Analyze the Fourth Option
- **Reaction**: 3 H2O (g) ⇌ 2 O3 (g)
- **Analysis**: This reaction suggests that water vapor can be converted into ozone. While ozone can be formed from oxygen, the direct conversion from water vapor to ozone is not typically represented this way. The reaction is not standard and does not represent a common process in chemistry.
- **Conclusion**: This statement is **correct**.

### Final Conclusion
After analyzing all the options, we find that:
- **Option 1**: Correct
- **Option 2**: Incorrect
- **Option 3**: Correct
- **Option 4**: Correct

Thus, the **incorrect statement** is **Option 2**.

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