Classify each of the following reactions as combination, decomposition, displacement or double displacement reactions :
`NH_(3(g))+HCl_((g))toNH_(4)Cl_((s))`

Explanation

To classify the given reaction `NH₃(g) + HCl(g) → NH₄Cl(s)`, we can follow these steps:

### Step 1: Identify the Reactants and Products
- The reactants in the reaction are ammonia (NH₃) and hydrogen chloride (HCl).
- The product formed is ammonium chloride (NH₄Cl).

### Step 2: Understand the Types of Reactions
- **Combination Reaction**: Two or more reactants combine to form a single product.
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