Neutralization — Homi Bhabha Class 9 Chemistry MCQs with Solutions
Free Homi Bhabha Class 9 Chemistry Neutralization MCQs with step-by-step solutions (10 questions). Part of Acids, Bases & Salts. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Neutralization · medium · theory
In a neutralisation reaction, an acid and a base react to form:
A. only salt
B. a new acid
C. hydrogen and oxygen
D. salt and water ✓ Correct
Solution: Acid + base → salt + water is the general neutralisation reaction.
Q2 — Neutralization · hard · theory
Hydrochloric acid reacts with sodium hydroxide to give:
A. sodium and chlorine
B. sodium chloride and water ✓ Correct
C. sodium carbonate
D. hydrogen and oxygen
Solution: HCl + NaOH → NaCl + H₂O (a neutralisation).
Q3 — Neutralization · medium · theory
An antacid tablet relieves acidity in the stomach by:
A. neutralising the excess hydrochloric acid ✓ Correct
B. cooling the stomach
C. producing more acid
D. increasing the acid
Solution: Antacids are mild bases that neutralise the excess stomach acid.
Q4 — Neutralization · hard · theory
A bee sting, which is acidic, can be soothed by applying:
A. baking soda (a mild base) ✓ Correct
B. common salt
C. vinegar (an acid)
D. lemon juice (an acid)
Solution: A mild base like baking soda neutralises the acidic sting.
Q5 — Neutralization · medium · theory
Farmers add slaked lime (calcium hydroxide) to acidic soil to:
A. neutralise the excess acidity ✓ Correct
B. add nitrogen
C. kill all crops
D. increase the acidity
Solution: The base neutralises the acid, restoring a pH suitable for crops.
Q6 — Neutralization · hard · theory
Toothpastes are usually basic in nature so that they can:
A. dissolve the teeth
B. produce hydrogen gas
C. neutralise the acids formed by bacteria in the mouth ✓ Correct
D. increase mouth acidity
Solution: Basic toothpaste neutralises acids that would otherwise attack tooth enamel.
Q7 — Neutralization · easy · theory
The reaction in which an acid and a base react together to produce a salt and water is called:
A. Corrosion
B. Oxidation
C. Neutralization ✓ Correct
D. Displacement
Solution: An acid plus a base gives a salt and water; this type of reaction is known as neutralization.
Q8 — Neutralization · medium · theory
A person with acidity (too much acid in the stomach) gets relief after taking an antacid such as milk of magnesia. The relief is mainly because the antacid:
A. Increases the amount of acid in the stomach
B. Neutralizes the excess stomach acid ✓ Correct
C. Converts the acid into a stronger acid
D. Removes all the water from the stomach
Solution: Milk of magnesia is a mild base that neutralizes the excess hydrochloric acid in the stomach, raising the pH and relieving the discomfort.
Q9 — Neutralization · medium · numerical
20 mL of hydrochloric acid is exactly neutralized by 40 mL of a sodium hydroxide solution. What volume of the same sodium hydroxide solution is needed to exactly neutralize 50 mL of the same acid?
A. 50 mL
B. 25 mL
C. 200 mL
D. 100 mL ✓ Correct
Solution: The acid needs twice its own volume of this base (40 ÷ 20 = 2). For 50 mL of acid, base required = 50 × 2 = 100 mL.
Q10 — Neutralization · hard · theory
When a strong acid is exactly neutralized by a strong base, the pH of the final solution and the temperature change observed are:
A. pH equal to 7, and the temperature rises ✓ Correct
B. pH less than 7, and the temperature rises
C. pH more than 7, and no change in temperature
D. pH equal to 7, and the temperature falls
Solution: Exact neutralization of a strong acid and strong base gives a neutral solution of pH 7, and because neutralization is exothermic, heat is released and the temperature rises.