KCET · Chemistry · Ionic Equilibrium
Which one of the following salts on being dissolved in water gives \(\mathrm{pH}>7\) at \(25^{\circ} \mathrm{C}\) ?
- A \(\mathrm{KCN}\)
- B \(\mathrm{KNO}_{3}\)
- C \(\mathrm{NH}_{4} \mathrm{Cl}\)
- D \(\mathrm{NH}_{4} \mathrm{CN}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{KCN}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{KCN}\) is a salt of weak acid and strong base hence, on being dissolved in water it gives basic solution i.e. \(\mathrm{pH}>7\) at \(25^{\circ} \mathrm{C}\).
\[ 2 \mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{P}_{2} \mathrm{O}_{5} \longrightarrow 2 \mathrm{SO}_{3}+\quad 4 \mathrm{HPO}_{3} \] Sulphur trioxide
\[ 2 \mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{P}_{2} \mathrm{O}_{5} \longrightarrow 2 \mathrm{SO}_{3}+\quad 4 \mathrm{HPO}_{3} \] Sulphur trioxide
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