229756
Which of the following pairs constitutes a buffer?
1 $\mathrm{HCl}$ and $\mathrm{KCl}$
2 $\mathrm{HNO}_2$ and $\mathrm{NaNO}_2$
3 $\mathrm{NaOH}$ and $\mathrm{NaCl}$
4 $\mathrm{HNO}_3$ and $\mathrm{NH}_4 \mathrm{NO}_3$
Explanation:
Acid pair constituent with $\mathrm{NHO}_2$ and $\mathrm{NaNO}_2$ because $\mathrm{HNO}_2$ is weak acid and $\mathrm{NaNO}_2$ is a salt of weak acid $\left(\mathrm{HNO}_2\right)$ with strong base $(\mathrm{NaOH})$. Hence, it is an example of acidic buffer solution.
NEET-2006
Ionic Equilibrium
229761
Which of the following is not a buffer?
1 $\mathrm{NH}_3+\mathrm{HCl}$
2 $\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}$
3 $\mathrm{HCOOH}+\mathrm{HCOOK}$
4 $\mathrm{NaOH}+\mathrm{NaNO}_3$
Explanation:
Because buffer solutions are mixture of weak acid or weak base their salts.
229756
Which of the following pairs constitutes a buffer?
1 $\mathrm{HCl}$ and $\mathrm{KCl}$
2 $\mathrm{HNO}_2$ and $\mathrm{NaNO}_2$
3 $\mathrm{NaOH}$ and $\mathrm{NaCl}$
4 $\mathrm{HNO}_3$ and $\mathrm{NH}_4 \mathrm{NO}_3$
Explanation:
Acid pair constituent with $\mathrm{NHO}_2$ and $\mathrm{NaNO}_2$ because $\mathrm{HNO}_2$ is weak acid and $\mathrm{NaNO}_2$ is a salt of weak acid $\left(\mathrm{HNO}_2\right)$ with strong base $(\mathrm{NaOH})$. Hence, it is an example of acidic buffer solution.
NEET-2006
Ionic Equilibrium
229761
Which of the following is not a buffer?
1 $\mathrm{NH}_3+\mathrm{HCl}$
2 $\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}$
3 $\mathrm{HCOOH}+\mathrm{HCOOK}$
4 $\mathrm{NaOH}+\mathrm{NaNO}_3$
Explanation:
Because buffer solutions are mixture of weak acid or weak base their salts.
