Chemistry 9th Chap 10 : Topic 3 - Maryam Publications

Chemistry Chapter 10 : Topic 3

Strong and Weak Acids

1 / 20

A student prepares four aqueous solutions of acids. Which observation best indicates a strong acid?

A) It produces few ions in water and shows weak electrical conductivity.

B) It completely ionizes in water producing a large number of hydrogen ions.

C) It forms a precipitate when dissolved in water.

D) It partially reacts with water to form ions and un-ionized molecules.

2 / 20

Which statement correctly defines a weak acid?

A) It completely ionizes in aqueous solution.

B) It produces only hydroxide ions in solution.

C) It does not dissolve in water at all.

D) It partially ionizes in water, establishing equilibrium.

3 / 20

Which equation correctly represents the dissociation of hydrochloric acid in water?

A) HCl → H⁺+Cl⁻ (complete)

B) HCl ⇌ H⁺+Cl⁻

C) HCl ⇌ H₂+Cl₂

D) HCl+H₂O → H₃O⁺+Cl⁻ (reversible)

4 / 20

Which acid is correctly classified as a weak acid?

A) CH₃COOH

B) HCl

C) H₂SO₄

D) HNO₃

5 / 20

A solution conducts electricity very strongly and shows complete ion formation. The solution most likely contains:

A) H₂CO₃

B) NH₄OH

C) CH₃COOH

D) HCl

6 / 20

Which statement best describes a strong base?

A) It reacts only with acids in solid form.

B) It partially dissociates in water producing OH⁻ ions.

C) It completely dissociates in water producing OH⁻ ions.

D) It does not produce ions in solution.

7 / 20

Which equation correctly represents nitric acid dissociation?

A) HNO₃ ⇌ H⁺+NO₃⁻

B) HNO₃ ⇌ NO₂+H₂O

C) HNO₃ → H⁺+NO₃⁻

D) HNO₃+H₂O ⇌ NH₄⁺+NO₃⁻

8 / 20

Why does ethanoic acid show weak conductivity compared to hydrochloric acid?

A) It is insoluble in water.

B) It partially ionizes producing fewer ions.

C) It contains no hydrogen atoms.

D) It completely ionizes in water.

9 / 20

Which of the following is TRUE about strong acids?

A) They exist mostly as molecules in water.

B) They completely dissociate into ions in water.

C) They do not produce hydrogen ions.

D) They ionize partially in aqueous solution.

10 / 20

A student writes: HA ⇌ H⁺+A⁻
This equation most likely represents:

A) Weak acid dissociation

B) Neutral salt formation

C) Strong acid dissociation

D) Strong base dissociation

11 / 20

Which acid is diprotic and strong?

A) HCl

B) H₂SO₄

C) CH₃COOH

D) HNO₃

12 / 20

What happens when a strong acid is dissolved in water?

A) Complete ionization occurs.

B) Only molecules are present.

C) Few ions are formed.

D) No ions are formed.

13 / 20

Which of the following represents a weak base?

A) KOH

B) NH₄OH

C) NaOH

D) Ca(OH)₂

14 / 20

Which statement best compares strong and weak acids?

A) Strong acids do not react with water.

B) Weak acids produce more ions than strong acids.

C) Strong acids are concentrated, weak acids are dilute.

D) Strong acids fully ionize, weak acids partially ionize.

15 / 20

Which pair correctly shows a strong acid and a weak acid?

A) HCl and CH₃COOH

B) CH₃COOH and HNO₃

C) H₂SO₄ and HCl

D) HCl and HNO₃

16 / 20

Why is sulphuric acid considered strong in its first ionization step?

A) It completely dissociates in first step.

B) It forms no ions in water.

C) It is insoluble in water.

D) It partially ionizes in all steps.

17 / 20

Which observation indicates a weak acid solution?

A) High electrical conductivity

B) Low ion concentration and partial dissociation

C) Rapid and complete ion formation

D) Strong heating effect in water

18 / 20

Which equation shows correct dissociation of ethanoic acid?

A) CH₃COOH ⇌ CH₄+CO₂

B) CH₃COOH → CH₃COO⁻+H⁺

C) CH₃COOH → CO₂+H₂O

D) CH₃COOH ⇌ CH₃COO⁻+H⁺

19 / 20

What is the key difference between strong and weak acids in terms of ion formation?

A) Both produce equal ions.

B) Strong acids produce more ions due to complete dissociation.

C) Strong acids form no ions.

D) Weak acids form more ions than strong acids.

20 / 20

Which of the following best explains why acids conduct electricity?

A) They are metallic in nature.

B) They contain free electrons.

C) They contain ions that move in solution.

D) They have covalent bonds only.

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