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Federal (FBISE) · Chapter test · Free

9th Class Chemistry Chapter 8 Test08. Energetics

25 marks · 40 minutes · 16 questions. Covers: 08. Energetics.

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9th Class Chemistry Chapter 8 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. Which is not released in an aerobic respiration?
    1. Carbon dioxide
    2. Water
    3. Energy
    4. Lactic acid
  2. If the value is negative then reaction will be:
    1. Exothermic
    2. Endothermic
    3. May or may not be Exothermic or Endothermic
    4. None of these
  3. Activation energy of a chemical reaction must be ________ the average kinetic energy of reacting molecules.
    1. Lower than
    2. greater than
    3. equal to
    4. None of these
  4. A catalyst increases the rate of a chemical reaction by:
    1. increasing activation energy
    2. increasing the enthalpy of reaction
    3. Decreasing the enthalpy of reaction
    4. None of these
  5. All chemical reactions involve:
    1. Catalysts
    2. Enzymes
    3. Energy changes
    4. All of these

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

  1. Which is/are responsible for acid rain?
    1. SO₂
    2. NO₂
    3. Both NO₂ and SO₂
    4. O₃
  2. Most air pollution is caused by:
    1. Ozone
    2. Acid rain
    3. Carbon monoxide
    4. The burning of fossil fuels
  3. Define exothermic and endothermic reactions.
  4. 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
  5. Which gas has the highest percentage in the air?
    1. O₂
    2. CO₂
    3. N₂
    4. O₃
  6. Define activation energy.
  7. Define enthalpy of a chemical reaction.
  8. Differentiate between aerobic and anaerobic respiration.

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

  1. Discuss the bond energy and bond dissociation energy?
  2. Differenciate between Exothermic and Endothermic reaction?
  3. Calculate the enthalpy of reaction between hydrogen and chlorine to form hydrogen chloride from the given bond energy data. Bond energy of H-H, Cl-Cl, H-Cl are 436 kJ/mol and 432 kJ/mol respectively.