The following reaction is an example of a
`4NH_(3)(g)+5O_(2)(g)rarr4NO(g)+6H_(2)O(g)`
1. displacement reaction
2.combination reaction
3. redox reaction
4.neutralisation reaction

Options

A. `1 and 4`
B. `2 and 3`
C. `1 and 3`
D. `3 and 4`

Explanation

To determine the type of reaction represented by the equation \(4NH_3(g) + 5O_2(g) \rightarrow 4NO(g) + 6H_2O(g)\), we can analyze the changes occurring in the reactants and products step by step.

### Step 1: Identify the Reactants and Products
The reactants in this reaction are ammonia (\(NH_3\)) and oxygen (\(O_2\)), while the products are nitric oxide (\(NO\)) and water (\(H_2O\)).

### Step 2: Analyze Oxidation and Reduction
- **Oxidation**: In this reaction, ammonia (\(NH_3\)) is being oxidized to nitric oxide (\(NO\)). This is because the nitrogen in ammonia is gaining oxygen, which indicates an increase in oxidation state.
- **Reduction**: Oxygen (\(O_2\)) is being reduced to water (\(H_2O\)). This occurs because the oxygen is gaining hydrogen atoms, which decreases its oxidation state.

### Step 3: Determine if Both Processes Occur
Since both oxidation (of \(NH_3\)) and reduction (of \(O_2\)) are occurring simultaneously, this indicates that the reaction is a redox reaction.

### Step 4: Check for Other Reaction Types
- **Displacement Reaction**: In this case, hydrogen from ammonia is being displaced by oxygen, which also qualifies this reaction as a displacement reaction.
- **Combination Reaction**: This does not fit as a combination reaction since we are not simply combining two substances to form one product.
- **Neutralization Reaction**: This is not a neutralization reaction as it does not involve an acid and a base reacting to form water and a salt.

### Conclusion
The reaction \(4NH_3(g) + 5O_2(g) \rightarrow 4NO(g) + 6H_2O(g)\) is primarily classified as a **redox reaction** due to the simultaneous oxidation and reduction processes. It can also be considered a **displacement reaction** because of the displacement of hydrogen by oxygen.

Thus, the correct answer is option **3**: redox reaction.

---