Quiz for Ionic Equilibrium

Q1: What is the pH of pure water at 25°C?

A. 7 B. 0 C. 14 D. 1

Q2: The ionization constant of water (Kw) at 25°C is approximately:

A. 1.0 × 10⁻¹⁴ B. 1.0 × 10⁻⁷ C. 7.0 × 10⁻¹⁴ D. 1.0 × 10⁻¹²

Q3: In acidic solution, the concentration of H⁺ ions is:

A. Greater than OH⁻ ions B. Less than OH⁻ ions C. Equal to OH⁻ ions D. Zero

Q4: Which of the following is a weak acid?

A. HCl B. HNO3 C. CH3COOH D. H2SO4

Q5: What is the pH of 0.01 M HCl solution?

A. 2 B. 4 C. 1 D. 3

Q6: The salt of a weak acid and strong base in water:

A. Produces acidic solution B. Produces basic solution C. Is neutral D. Depends on concentration

Q7: The common ion effect:

A. Increases ionization B. Decreases ionization C. No effect on ionization D. Destroys ions

Q8: The pH of a solution is 5, then the concentration of H⁺ ions is:

A. 10⁻⁵ M B. 10⁻⁹ M C. 10⁵ M D. 5 M

Q9: The ionization constant Ka of an acid is 1 × 10⁻⁵. The acid is:

A. Strong acid B. Moderately strong C. Weak acid D. Neutral

Q10: In a buffer solution:

A. pH changes drastically on addition of acid/base B. pH remains nearly constant C. Only acidic solution D. Only basic solution

Q11: Which of the following is an example of a buffer solution?

A. NaCl solution B. HCl solution C. CH3COOH and CH3COONa mixture D. NaOH solution

Q12: The pOH of pure water at 25°C is:

A. 7 B. 0 C. 14 D. 1

Q13: The hydrolysis of salt solutions depends on:

A. Nature of acid and base B. Only acid C. Only base D. Concentration only

Q14: Which ion contributes to acidity in aqueous solutions?

A. OH⁻ B. H⁺ C. Na⁺ D. Cl⁻

Q15: At 25°C, Kw = 1.0 × 10⁻¹⁴. What is [OH⁻] in pure water?

A. 1.0 × 10⁻⁷ M B. 1.0 × 10⁻¹⁴ M C. 7.0 × 10⁻⁷ M D. 1.0 M

Q16: Which of the following has the highest pH?

A. HCl B. NaOH C. CH3COOH D. NaCl

Q17: The relation between pH and pOH is:

A. pH + pOH = 7 B. pH + pOH = 14 C. pH - pOH = 14 D. pH × pOH = 14

Q18: The acidic strength of oxoacids increases with:

A. Decrease in electronegativity of central atom B. Increase in number of oxygen atoms C. Decrease in number of oxygen atoms D. Decrease in oxidation state

Q19: Which of the following salt solutions will be neutral?

A. NaCl B. NH4Cl C. NaCN D. NH4CN

Q20: pH of a 1 × 10⁻⁶ M HCl solution is:

A. 6 B. 7 C. 5 D. 1