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Federal (FBISE) · Chapter test · Free

9th Class Chemistry Chapter 5 Test05. Chemical bonding

30 marks · 40 minutes · 21 questions. Covers: 05. Chemical bonding.

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9th Class Chemistry Chapter 5 Test

9th Class · Chemistry · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

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

  1. Benzene is:
    1. Polar compound
    2. Non-polar compound
    3. Homoatomic compound
    4. Monoatomic compound
  2. The atoms having less than 2 or 8 electrons in their valence shell are:
    1. Stable
    2. Inreactive
    3. Unstable
    4. Noble gases
  3. Which of the following is not true about the formation of Na₂S:
    1. Each sodium atom loses one electron
    2. Sodium forms cation
    3. Sulphur forms anion
    4. Each sulphur atom gains one electron
  4. Which of the following atoms obey duplet rule?
    1. O₂
    2. F₂
    3. H₂
    4. N₂
  5. Atoms achieve stability by attaining electronic configuration of:
    1. Halogens
    2. Transition metals
    3. Noble gases
    4. Non-metals
  6. Why do atom react?
  7. Which of the following atoms will not form cation or anion.
    1. Atomic no. 16
    2. Atomic no. 17
    3. Atomic no. 18
    4. Atomic no. 19
  8. Polar covalent compounds usually dissolve in:
    1. Water
    2. Alcohol
    3. Acid
    4. Ether
  9. What is the effect on bond formation when attractive and repulsive forces become dominant?
  10. The force of attraction which holds atom together is called:
    1. Ionic bond
    2. Intermolecular force
    3. Covalent bond
    4. Chemical bond

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

  1. Gram atom of Na is equal to:
    1. 23 amu
    2. 23 g
    3. 24 amu
    4. None
  2. 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
  3. Give importance of noble gas electronic configuration.
  4. How does Al form cation?
  5. How we can obtain the number of valance electrons in an atom using the periodic table of the following element?(a)Carbon (b)Magnesium (c) Phosphorus
  6. What is the effect on bond formation when attractive and repulsive forces become dominant?
  7. All chemical reactions involve:
    1. Catalysts
    2. Enzymes
    3. Energy changes
    4. All of these
  8. Why do atom react?

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

  1. Represent the formation of cations for the following metal atoms using electron dot structures: (a) Al (b) Sr (c) Ba
  2. Describe the importance of noble gas electronic configuration.
  3. An atom of an element has atomic number 9 and mass number 19. (a) State the number of protons and neutrons in the nucleus of this atom. (b) State the number of electrons in this atom. (c) Show with electron cross-dot diagrams, the formation of ions by this atom. (d) Write electronic configuration of this element. (e) Point out its group in the periodic table. (f) Point out its period in the periodic table.