What is the pH of a solution with [H₃O⁺] = 10⁻⁵ M at 25 °C?
A) 3 B) 5 C) 7 D) 9 Answer: B Explanation: pH equals minus log base ten of hydronium concentration. […]
Acids, Bases & Salts, Chemistry
Chemistry
Acids, Bases & Salts, Chemistry
What is the pH of a solution with hydrogen-ion concentration 10⁻³ mol/L ideally?
A) 11 B) 7 C) 0 D) 3 Answer: D Explanation: pH is negative logarithm of hydrogen-ion activity approximately. For […]
Acids, Bases & Salts, Chemistry
What pair commonly makes an acidic buffer?
A) A strong acid and a strong base in equal pure form B) Two noble gases C) Only pure water […]
Acids, Bases & Salts, Chemistry
What reaction type occurs when acid and carbonate release carbon dioxide?
A) Nuclear fusion B) Photosynthesis C) Gas-evolution reaction D) Freezing Answer: C Explanation: Acid reacts with carbonate to form a […]
Acids, Bases & Salts, Chemistry
When zinc reacts with a dilute acid, which gas is commonly released?
A) Oxygen B) Nitrogen C) Hydrogen D) Argon Answer: C Explanation: Reactive zinc displaces hydrogen from many dilute acids. The […]
Acids, Bases & Salts, Chemistry
Which acid is diprotic in common acid-base chemistry?
A) HCl B) H₂SO₄ C) HNO₃ D) CH₃COOH Answer: B Explanation: Sulfuric acid can donate two protons per formula unit. […]
Acids, Bases & Salts, Chemistry
Which acid is present in human stomach juice?
A) Hydrochloric acid B) Acetic acid C) Nitric acid D) Citric acid Answer: A Explanation: The stomach secretes hydrochloric acid. […]
Acids, Bases & Salts, Chemistry
Which acid is produced in muscles during some high-intensity activity?
A) Lactic acid B) Hydrochloric acid C) Sulfuric acid D) Nitric acid Answer: A Explanation: Lactate production increases when glycolysis […]
Acids, Bases & Salts, Chemistry
Which acid is responsible for the sour taste of citrus fruits?
A) Citric acid B) Hydrochloric acid C) Nitric acid D) Sulfuric acid Answer: A Explanation: Citrus fruits contain citric acid. […]
Acids, Bases & Salts, Chemistry
Which acid is triprotic under the usual aqueous dissociation model?
A) HCl B) HNO₃ C) H₃PO₄ D) CH₃COOH Answer: C Explanation: Phosphoric acid has three ionizable hydrogens. Its dissociation can […]