2nd Year Chemistry 1st Quarter Book Paper

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

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. If Kpc > 1, it means the solute is more soluble in:
   1. Organic solvent
   2. Water
   3. Both equally
   4. None of these
3. If overall E° of reaction is positive, the reaction is:
   1. Not feasible
   2. Feasible
   3. Endothermic only
   4. At equilibrium
4. Reduction is defined as:
   1. Loss of protons
   2. Gain of electrons
   3. Loss of neutrons
   4. Loss of electrons
5. Industrial chemicals, if mismanaged, mainly cause:
   1. Environmental pollution
   2. Medical advancements
   3. Higher crop production
   4. Clean energy
6. The point at which moles of acid = moles of base is called:
   1. Endpoint
   2. Neutral point
   3. Equivalence point
   4. Indicator point
7. 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)
8. The bicarbonate buffer system in blood involves:
   1. NH₄OH and NH₄Cl
   2. NaOH and Na₂CO₃
   3. HCl and NaCl
   4. H₂CO₃ and HCO₃⁻
9. In stability constant expression for [CoCl₄]²⁻, Kstab = ?
   1. [CoCl₄]²⁻ / [Co(H₂O)₆]²⁺ [Cl⁻]⁴
   2. [Co(H₂O)₆]²⁺ / [CoCl₄]²⁻
   3. [Cl⁻]⁴ / [Co(H₂O)₆]²⁺
   4. None
10. In a redox reaction, the oxidizing agent:
    1. Loses electrons
    2. Gains electrons
    3. Loses protons
    4. Gains protons
11. Which of the following is a positive impact of chemical substances on human health?
    1. Respiratory diseases
    2. Medical advancements
    3. Water pollution
    4. Soil pollution
12. The mathematical expression for pH is:
    1. pH = log [H⁺]
    2. pH = –log [H⁺]
    3. pH = log [OH⁻]
    4. pH = –log [OH⁻]