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IB DP Chemistry Mock Exam HL Paper 1A Set 2 - 2025 Syllabus

IB DP Chemistry Mock Exam HL Paper 1A Set 2

Prepare for the IB DP Chemistry Exam with our comprehensive IB DP Chemistry Exam Mock Exam HL Paper 1A Set 2. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam

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Question 

Germanium can exist in several stable oxidation states. Which row lists these species in order of increasing radius?
(A) Ge4+, Ge2+, Ge, Ge4−
(B) Ge4+, Ge4−, Ge2+, Ge
(C) Ge, Ge4−, Ge4+, Ge2+
(D) Ge2+, Ge, Ge4−, Ge4+
▶️ Answer/Explanation
Detailed solution

Ionic radius increases with more electrons and lower nuclear charge per electron:

  • Ge4+ (fewest electrons, highest effective nuclear charge) → smallest
  • Ge2+
  • Ge (neutral atom)
  • Ge4− (most electrons, electron-electron repulsion) → largest

✅ Answer: (A) – Ge4+, Ge2+, Ge, Ge4−

Question 

Which elements would react with one another most vigorously?
(A) K(s) and Br2(g)
(B) K(s) and Cl2(g)
(C) Na(s) and Br2(g)
(D) Na(s) and Cl2(g)
▶️ Answer/Explanation
Detailed solution

Reactivity depends on:

  • Metal: K is more reactive than Na (lower ionization energy)
  • Halogen: Cl2 is more reactive than Br2 (higher electronegativity)

Most vigorous reaction: Most reactive metal (K) + most reactive halogen (Cl2)

✅ Answer: (B)

Question 

Which statement explains why transition elements exhibit variable oxidation states?
(A) d-Electrons are delocalized.
(B) All have a +2 oxidation state.
(C) They can accept electron pairs from ligands.
(D) Successive ionization energies are close in value.
▶️ Answer/Explanation
Detailed solution

Transition elements have variable oxidation states because:

  • They have similar energies for 4s and 3d electrons
  • Successive ionization energies are close in value
  • This allows removal of different numbers of electrons without a large energy jump

✅ Answer: (D)

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