` NH_4Cl` is a salt of a

Options

A. weak acid and weak base
B. weak acid and strong base
C. strong acid and base
D. strong acid and weak base

Explanation

To determine what type of salt \( NH_4Cl \) is, we need to analyze the components from which it is formed. Here’s a step-by-step breakdown:

### Step 1: Identify the components of \( NH_4Cl \)
- \( NH_4Cl \) is composed of \( NH_4^+ \) (ammonium ion) and \( Cl^- \) (chloride ion).
- The ammonium ion \( NH_4^+ \) comes from the weak base \( NH_4OH \) (ammonium hydroxide).
- The chloride ion \( Cl^- \) comes from the strong acid \( HCl \) (hydrochloric acid).

**Hint:** Look for the acid and base that combine to form the salt.

### Step 2: Classify the acid and base
- **Strong Acid:** \( HCl \) is a strong acid because it completely dissociates in water.
- **Weak Base:** \( NH_4OH \) is a weak base because it does not completely dissociate in water.

**Hint:** Remember that strong acids fully dissociate in solution, while weak bases do not.

### Step 3: Determine the nature of the salt
- Since \( NH_4Cl \) is formed from a strong acid (\( HCl \)) and a weak base (\( NH_4OH \)), it is classified as a salt of a strong acid and a weak base.

**Hint:** Consider how the strength of the acid and base affects the properties of the resulting salt.

### Conclusion
Thus, \( NH_4Cl \) is a salt of a strong acid and a weak base.

**Final Answer:** \( NH_4Cl \) is a salt of a strong acid and a weak base.