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Federal (FBISE) · Quarter book test · Free

9th Class Chemistry 2nd Quarter Book Paper

40 marks · 1 hour · 28 questions. Covers: 5 chapters (06. Stoichiometery to 10. Acids, Bases, and Salts).

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9th Class Chemistry 2nd Quarter Book Paper

9th Class · Chemistry · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 40Time: 1 hour

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. Oxidation involves:
    1. loss of electrons
    2. gain of electron
    3. gain of hydrogen
    4. none of these
  2. What is the mass of carbon present in 44 g of carbon dioxide?
    1. 12 g
    2. 6 g
    3. 24 g
    4. 44 g
  3. Which is not released in an aerobic respiration?
    1. Carbon dioxide
    2. Water
    3. Energy
    4. Lactic acid
  4. Concentration of reactants and products at equilibrium remains unchanged if:
    1. concentration of any reactant or product is not changed
    2. temperature of the reaction is not changed.
    3. pressure or volume of the system is not changed.
    4. all of the above are observed.
  5. Consider the reaction: H₂O + HCl ⇌ H₃O⁺ + Cl⁻. Which species is a proton acceptor in this reaction?
    1. H₂O
    2. HCl
    3. H₃O⁺
    4. none
  6. Oxidation is shown by:
    1. metals
    2. non-metals
    3. both a and b
    4. none of these
  7. Number of particles in one mole of a substance is called:
    1. Atomic number
    2. Particle number
    3. Avogadro’s number
    4. Mass number
  8. 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
  9. Which is true about the equilibrium state?
    1. The forward reaction stops.
    2. The reverse reaction stops.
    3. Both forward and reverse reaction stop.
    4. Both forward and reverse reaction continue at the same rate.
  10. 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
  11. Silver tarnish in the presence of:
    1. SO₂
    2. H₂S
    3. Both a and b
    4. None of these
  12. What is the molar mass of H₃PO₄?
    1. 58.5
    2. 98
    3. 40
    4. 48

Q2. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. During galvanizing iron sheet is dipped into:
    1. Sn
    2. Zn
    3. SnCl₂
    4. ZnCl₂
  2. What harmfull substances can wastewater carry?
    1. only minerals
    2. pathogens,bacteria
    3. pure water
    4. oxygen
  3. Which is/are responsible for acid rain?
    1. SO₂
    2. NO₂
    3. Both NO₂ and SO₂
    4. O₃
  4. What air pollution is released by volcanos?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides
  5. Explain one example from daily life which involves oxidation-reduction reaction?
  6. Silver tarnish in the presence of:
    1. SO₂
    2. H₂S
    3. Both a and b
    4. None of these
  7. 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
  8. Most air pollution is caused by:
    1. Ozone
    2. Acid rain
    3. Carbon monoxide
    4. The burning of fossil fuels
  9. Write two chemical equations of reversible reactions.
  10. What is oxidation state?
  11. By painting the metal __________ cannot touch the metal surface.
    1. oxygen
    2. moisture
    3. both a and b
    4. none of them
  12. Define Nuetralization reaction?

Q3. Long questions (Attempt any 3 of 4 · 3 × 4 = 12)

  1. Write equations showing the ionization of the following as Arrhenius acids. (a) HI₍aq₎ (b) HNO₂₍aq₎
  2. Discuss the bond energy and bond dissociation energy?
  3. Give methods for corrosion prevention.
  4. Explain Gram atomic mass, Gram molecular mass and Gram formula mass.