Identify the Acidic salt? NaCl,NaNO3,NH4Cl

Options

A. Piezoelectric crystals are used as pick-ups in record players, they are also used in microphones, ultrasonic generators, and sonar detectors.
B. `BaTiO_(3)`, Rochelle salt, `KH_(2)PO_(4)`, and quartz are ferroelectric and piezoelectric solids.
C. The temperature above which no ferromagnetism is observed is called curie termperature.
D. The temperature at which the material shows super-conductivity is called transition termperature.

Explanation

To identify the acidic salt among the given options (NaCl, NaNO3, NH4Cl), we can analyze each salt based on the strength of the acid and base from which they are derived.

### Step-by-Step Solution:

1. **Identify the components of each salt:**
- **NaCl**: This salt is formed from sodium hydroxide (NaOH), a strong base, and hydrochloric acid (HCl), a strong acid.
- **NaNO3**: This salt is formed from sodium hydroxide (NaOH), a strong base, and nitric acid (HNO3), also a strong acid.
- **NH4Cl**: This salt is formed from ammonium hydroxide (NH4OH), a weak base, and hydrochloric acid (HCl), a strong acid.

2. **Determine the nature of each salt:**
- **NaCl**: Since both the acid and base are strong, NaCl is a neutral salt. It does not affect the pH of the solution.
- **NaNO3**: Similar to NaCl, both components are strong (strong acid and strong base), making NaNO3 also a neutral salt.
- **NH4Cl**: Here, the base (NH4OH) is weak and the acid (HCl) is strong. This results in an excess of H+ ions in solution, making NH4Cl an acidic salt.

3. **Conclusion:**
- Among the given salts, NH4Cl is the only acidic salt because it is derived from a weak base and a strong acid.

### Final Answer:
The acidic salt among the given options is **NH4Cl**.

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