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Punjab (PTB) · Chapter test · Free

2nd Year Chemistry Chapter 1 TestGROUP 2 ELEMENTS

30 marks · 40 minutes · 21 questions. Covers: CHAP 17: GROUP 2 ELEMENTS.

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2nd Year Chemistry Chapter 1 Test

2nd Year · Chemistry · Punjab (PTB)

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

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

  1. Compared to Group 1 metals, Group 2 metals exhibit:

    1. Higher hardness and higher density

    2. Lower hardness and lower density

    3. Lower boiling points and higher solubility

    4. Softness allowing knife cutting and lower melting points

  2. The species formed when a Group 2 basic oxide (e.g., CaO) reacts with water:

    1. A salt and hydrogen

    2. A metal hydroxide

    3. A metal carbonate

    4. A salt and water

  3. Why does Beryllium resist reaction with water?

    1. Low density

    2. High reactivity

    3. High solubility

    4. Protective oxide layer

  4. Which of the following groups of elements contains only essential firework colorants?

    1. Be, Mg, Ca, Sr

    2. Be, Ca, Sr, Ba

    3. Li, Na, K, Rb

    4. Mg, Ca, Sr, Ba

  5. Magnesium metal is used in lightweight alloys for aerospace and automotive applications because of its:

    1. High density

    2. Light weight and strength

    3. Inability to conduct heat

    4. High solubility in water

  6. What role do water molecules play in hydrated Group 2 metal ions?

    1. Protons donors

    2. Catalysts

    3. Electron pair acceptors

    4. Electron pair donors

  7. What is the valence shell electronic configuration of Group 2 elements?

    1. ns1

    2. ns2

    3. ns2 np1

    4. ns2 np2

  8. What temperature range is typically required in a lime kiln for the thermal decomposition of limestone?

    1. 100–200°C

    2. 400–500°C

    3. 900–1000°C

    4. 2000–2500°C

  9. EDTA is a donor of how many electron pairs?

    1. Two

    2. Four

    3. Six

    4. Eight

  10. Which Group 2 metal is transparent to X-rays and used in X-ray tubes?

    1. Strontium

    2. Magnesium

    3. Beryllium

    4. Calcium

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

  1. Why do Group 2 metals conduct electricity better than Group 1 metals?

  2. Why does solubility of Group 2 hydroxides increase in terms of the relative changes in Hohyd and Holattice?

  3. What type of chemical process do Group 2 elements undergo during reactions?

  4. State one agricultural use of CaCO3, and the chemical principle involved.

  5. What is a ring-like complex structure?

  6. In Dow Process, write the balanced equation for the precipitation of magnesium ions from seawater.

  7. Why do top elements in Group 2 form complexes more easily than bottom elements?

  8. Explain why Group 2 elements are reactive, based on their electron configuration and ion formation.

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

  1. Describe the industrial preparation of quicklime from limestone. Explain the calcination process, reaction conditions, equilibrium control, and major industrial applications.

  2. Describe the reactivity of Group 2 elements with water and dilute hydrochloric acid. Provide relevant chemical equations and differences in their reactivity.

  3. Discuss the properties and trends of Group 2 elements from Be to Ba.