1st Year Chemistry Chapter 9 Test09. Acids - Base Chemistry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The common ion effect occurs when:
   1. Two strong acids are mixed
   2. Two salts are decomposed
   3. Two bases are neutralized
   4. Two compounds produce the same ion in solution
2. When air is bubbled through pure water, the pH is lowered from 7.0 to 5.6, which gas in the air is responsible for this change.
   1. Argon
   2. Carbon dioxide
   3. Nitrogen
   4. Oxygen
3. The formula for calculating pH is:
   1. pH = log [H⁺]
   2. pH = -log [OH⁻]
   3. pH = log [OH⁻]
   4. pH = -log [H⁺]
4. The pH range of phenolphthalein is:
   1. 46025
   2. 3.5-5.5
   3. 46244
   4. 46180
5. An aqueous solution of which compound is basic.
   1. Ammonium nitrate
   2. Calcium chloride
   3. Ammonium acetate
   4. Potassium carbonate
6. Which of the following is an example of weak acid and strong base titration?
   1. HCl vs NaOH
   2. Oxalic acid vs NaOH
   3. H₂SO₄ vs KOH
   4. CH₃COOH vs NH₄OH
7. If the pKa value of an acid is high, the acid is:
   1. Stronger
   2. Weaker
   3. Neutral
   4. Amphoteric
8. For acidic buffers, the equation used is:
   1. pH = pKa + log [acid]/[salt]
   2. pH = pKa + log [salt]/[acid]
   3. pH = pKa - log [salt]/[acid]
   4. pH = -log [salt][acid]
9. The unit of solubility product constant depends on:
   1. Nature of solvent
   2. Pressure only
   3. Temperature only
   4. Number of ions produced
10. The strength of an acid is expressed in terms of:
    1. Kc
    2. Ka
    3. Kw
    4. pH