To determine which reaction yields a neutral salt, we need to identify if the reaction involves both a strong acid and a strong base. A neutral salt is typically formed when a strong acid reacts with a strong base.
Let's analyze each reaction given:
1. [tex]\(2 \text{NaOH} + \text{H}_2\text{SO}_4\)[/tex]
- NaOH is listed as a strong base.
- [tex]\( \text{H}_2\text{SO}_4 \)[/tex] is listed as a strong acid.
- A reaction between a strong base and a strong acid will yield a neutral salt.
2. [tex]\( \text{NaOH} + \text{HCN} \)[/tex]
- NaOH is listed as a strong base.
- [tex]\( \text{HCN} \)[/tex] is listed as a weak acid.
- A reaction between a strong base and a weak acid will not yield a neutral salt.
3. [tex]\( \text{KOH} + \text{HF} \)[/tex]
- KOH is listed as a strong base.
- HF is listed as a weak acid.
- A reaction between a strong base and a weak acid will not yield a neutral salt.
4. [tex]\(2 \text{NH}_4\text{OH} + \text{H}_2\text{SO}_4\)[/tex]
- [tex]\( \text{NH}_4\text{OH} \)[/tex] is listed as a weak base.
- [tex]\( \text{H}_2\text{SO}_4 \)[/tex] is listed as a strong acid.
- A reaction between a weak base and a strong acid will not yield a neutral salt.
Only the first reaction involves both a strong acid and a strong base. Therefore, only the first reaction will yield a neutral salt.
The reaction that would yield a neutral salt is:
[tex]\[ 2 \text{NaOH} + \text{H}_2\text{SO}_4 \][/tex]
This corresponds to the first reaction in the given list. So, the correct answer is:
1. [tex]\(2 \text{NaOH} + \text{H}_2\text{SO}_4 \)[/tex]
