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Federal (FBISE) · Chapter test · Free

9th Class Chemistry Chapter 10 Test10. Acids, Bases, and Salts

25 marks · 40 minutes · 16 questions. Covers: 10. Acids, Bases, and Salts.

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9th Class Chemistry Chapter 10 Test

9th Class · Chemistry · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 25Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 5 × 1 = 5)

  1. Consider the reaction: H₂O + HCl ⇌ H₃O⁺ + Cl⁻. Which species is a proton acceptor in this reaction?
    1. H₂O
    2. HCl
    3. H₃O⁺
    4. none
  2. Milk of magnesia contains Mg(OH)₂. It is used as antacid. It neutralizes excess stomach acid. Which salt is formed in this reaction?
    1. MgSO₄
    2. MgCO₃
    3. MgCl₂
    4. MgO
  3. Which of the following cannot be classified as Arrhenius acid?
    1. HNO₃
    2. H₂CO₃
    3. CO₂
    4. H₂SO₄
  4. Which of the following is a Bronsted base?
    1. NH₃
    2. HCl
    3. CH₃COOH
    4. H₃O⁺
  5. Ammonia is a base, because it:
    1. ionizes in water to give OH⁻ ions
    2. Contains OH group
    3. Can accept an election pair
    4. Can accept proton

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. What harmfull substances can wastewater carry?
    1. only minerals
    2. pathogens,bacteria
    3. pure water
    4. oxygen
  2. What role do essential minerals in natural water play?
    1. they decreasen enzyme activity
    2. they provide necessary elements for biological processes
    3. they make water undrinkable
    4. they cause water to become more acidic
  3. Define Nuetralization reaction?
  4. Where do fish and other marine life get their oxygen?
    1. From air bubbles
    2. From dissolved
    3. From food
    4. From sunlight
  5. Define and give examples of Arrhenius acids.
  6. Why HCl acts as a strong acid?
  7. Why NH₃ acts as Bronsted-Lowry base?
  8. What types of harmfull microbes can be found in natural water sources?
    1. only bacteria
    2. only viruses
    3. bacteria.viruses
    4. only parasites

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Write equations showing the ionization of the following as Arrhenius acids. (a) HI₍aq₎ (b) HNO₂₍aq₎
  2. Expalin oxides and hydroxides?
  3. Write balanced chemical equations for the following chemical reactions. (i) Sulphuric acid + Magnesium hydroxide → magnesium sulphate + water (ii) Sulphuric acid + Sodium Carbonate → Sodium sulphate + water (iii) Hydrochloric acid + Magnesium → Magnesium chloride + hydrogen gas