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Federal (FBISE) · Chapter test · Free

2nd Year Chemistry Chapter 5 Test05. Group 2 Elements

30 marks · 40 minutes · 21 questions. Covers: 05. Group 2 Elements.

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2nd Year Chemistry Chapter 5 Test

2nd Year · Chemistry · Federal (FBISE)

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

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

  1. The high tendency of Be²⁺ to form complexes is due to:
    1. Large size and low charge density
    2. Small size and high charge density
    3. Covalent character
    4. Presence of 3d orbitals
  2. Why is MgSO₄ more soluble than BaSO₄?
    1. Higher lattice energy of BaSO₄
    2. Higher hydration enthalpy of Mg²⁺
    3. Larger ionic size of Ba²⁺
    4. Both (a) and (b)
  3. As we go down Group 2, the atomic radius:
    1. Decreases
    2. Remains constant
    3. Increases
    4. First decreases then increases
  4. Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
    1. CaSO₄
    2. BaSO₄
    3. BeSO₄
    4. SrSO₄
  5. Which gas is released during the decomposition of Group 2 carbonates?
    1. NO₂
    2. O₂
    3. CO₂
    4. H₂
  6. Calcium hydroxide is used in agriculture because it:
    1. Lowers soil pH
    2. Neutralises acidic soil
    3. Provides nitrogen
    4. Provides phosphorus
  7. Beryllium oxide (BeO) is:
    1. Acidic
    2. Basic
    3. Amphoteric
    4. Neutral
  8. Which Group 2 element is used in flares and fireworks due to its bright white flame?
    1. Beryllium
    2. Magnesium
    3. Calcium
    4. Strontium
  9. Beryllium is commonly extracted from:
    1. Beryl (Be₃Al₂(SiO₃)₆)
    2. Limestone
    3. Magnesite
    4. Dolomite
  10. The correct order of solubility of Group 2 sulphates is:
    1. MgSO₄ > CaSO₄ > SrSO₄ > BaSO₄
    2. BaSO₄ > SrSO₄ > CaSO₄ > MgSO₄
    3. SrSO₄ > MgSO₄ > CaSO₄ > BaSO₄
    4. CaSO₄ > BaSO₄ > SrSO₄ > MgSO₄

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

  1. Compare the ability of Be²⁺ and Ba²⁺ to form complexes.
  2. How does the reaction of Group 2 metals with dilute acids vary down the group?
  3. Write the purification step of beryllium after Be(OH)₂ formation.
  4. Why does the ionization energy decrease down Group 2?
  5. What happens to lattice energy of hydroxides down the group?
  6. Write the order of solubility of Group 2 hydroxides.
  7. Why do Group 2 metals act as reducing agents?
  8. Why does barium need to be stored in oil?

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

  1. Write a detailed note on the general methods of extraction of Group 2 elements .
  2. Describe and explain the trend in atomic radius and melting points of Group 2 elements down the group.
  3. Explain the trend in solubility of Group 2 hydroxides down the group with reference to lattice energy and hydration enthalpy.