WBJEE · Chemistry · Ionic Equilibrium
Which of the statements are incorrect?
- A \(\mathrm{pH}\) of a solution of salt of strong acid and weak base is less than 7 .
- B \(\mathrm{pH}\) of a solution of a weak acid and weak base is basic if \(\mathrm{K}_{\mathrm{b}} < \mathrm{K}_{\mathrm{a}}\).
- C \(\mathrm{pH}\) of an aqueous solution of \(10^{-8}(\mathrm{M}) \mathrm{HCl}\) is 8 .
- D Conjugate acid of \(\mathrm{NH}_2^{-}\)is \(\mathrm{NH}_3\).
Answer & Solution
Correct Answer
(C) \(\mathrm{pH}\) of an aqueous solution of \(10^{-8}(\mathrm{M}) \mathrm{HCl}\) is 8 .
Step-by-step Solution
Detailed explanation
* \(\mathrm{pH}\) of a solution of strong acid and weak base \(\left(\right.\) say \(\left.\mathrm{NH}_4 \mathrm{Cl}\right)\) is less than \(7 .\) * For hydrolysis of salt of weak acid and weak base. When \(\mathrm{K}_{\mathrm{a}}>\mathrm{K}_{\mathrm{b}}, \quad \mathrm{pH} < 7\)…
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