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Q30
(CISF/2020)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Which one of the following aqueous solutions will be neutral ?
Result
Your answer:
—
·
Correct:
B
Explanation
An aqueous solution is neutral when the salt is derived from a strong acid and a strong base. In such cases, neither the cation nor the anion undergoes hydrolysis, leaving the pH of the solution at approximately 7.
- NaCl (Sodium Chloride): It is the salt of a strong base (NaOH) and a strong acid (HCl). Since neither ion reacts with water to produce excess H+ or OH-, the solution is neutral.
- NHẠCI (Ammonium Chloride): This is a salt of a weak base (NH4OH) and a strong acid (HCl). The NH4+ ion undergoes cationic hydrolysis, making the solution acidic.
- KCN (Potassium Cyanide): This is a salt of a strong base (KOH) and a weak acid (HCN). The CN- ion undergoes anionic hydrolysis, making the solution basic.
- NaHSO4 (Sodium Bisulfate): This is an acid salt that dissociates to release H+ ions, resulting in an acidic solution.
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