250+ TOP MCQs on Acids and Bases and Answers

Organic Chemistry Multiple Choice Questions on “Acids and Bases”.

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1. Which one is correctly matched?
a) Acids – pH range above7
b) Acids – pH range below 7
c) Acids – pH range 7(neutral)
d) Acids – pH range 8-9
Answers: b
Clarification: Acids have a pH range less than 7, Water is the only solvent that has a pH of 7 (neutral).

2. A Strong acid is same as concentrated acid.
a) False
b) True
Answer: a
Clarification: Concentration of an acid depends upon the water content whereas the strength of an acid depends on dissociation power.

3. When an acid reacts with a metal, which one of the following gas is usually liberated?
a) ammonia gas
b) chlorine
c) oxygen
d) Hydrogen gas
Answer: d
Clarification: When metal reacts with acid, a soap bubble is formed and the bubble contains Hydrogen gas (example: HCl, H₂SO₄).

4. Which of the following is wrongly mapped?
a) Sodium carbonate – Washing soda
b) Sodium chloride – common salt
c) Calcium carbonate – slaked lime
d) Sodium hydroxide – caustic soda
Answer: c
Clarification: calcium hydroxide is commonly referred as slaked lime.

5. What will be the X in the following equation?
MgO + 2HCl —-> X + H₂O
a) Mg₂Cl
b) 2MgCl
c) MgCl
d) MgCl₂
Answer: d
Clarification: MgCl₂ is the product formed when magnesium oxide reacts with hydrochloric acid and water is formed as a by-product.

6. Which of the following is neither an acid nor base?
a) CH₃COOH
b) HCl
c) KCl
d) CH₃OH
Answer: c
Clarification: CH₃COOH and CH₃OH are organic acids, HCl is strong acid and KCl is a salt.

7. Which one will change from red litmus to blue?
a) NaCl
b) HCl
c) KOH
d) LiOH
Answer: b
Clarification: since HCl is a base it turns red litmus to blue.

8. What is the pH of 0.0001 molar HCl solution?
a) 1
b) 2
c) 3
d) 4
Answer: d
Clarification: It has a H+ concentration of 10^-4. The value of negative exponent(^-4) gives pH value to be 4.

9. What will be the product when HNO₃ reacts with NH₄OH?
a) NH₄ NO₃
b) 2NH₄ NO₃
c) NH₄ (NO₃)²
d) NH₂NO₃
Answer: a
Clarification: the reaction takes place as follows:
HNO₃ + NH₄OH —-> NH₄NO₃ + H₂O.

10. Find the odd one out.
a) Neutral salt : NaCl
b) Acid salt : CuSO₄.5H₂O
c) Basic salt: CuCO₃.Cu(OH)²
d) Nonhydrated salt: KNO₃
Answer: b
Clarification: CuSO₄.5H₂0 is a hydrated salt. An example of acid salt is NaHCO₃.