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👆👆👆👆👆👆👆👆 NABTEB COMMERCE QUESTIONS ABOVE( TYPE B)

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(2b) -Salt A: Zinc carbonate (or Lead(II) carbonate or Aluminium carbonate) -Salt B: Calcium chloride

(3ai) No, the titre value would not be affected. (3aii) Washing down the splashed acid or base with a small amount of distilled water does not change the titre because distilled water does not react with the solution. It only ensures that all the reacting solution is inside the main bulk so the reaction goes to completion. The number of moles of acid and base remains the same, so the titre is unchanged. (3bi) (i) The pH range of the indicator. (ii) The type of acid–base reaction or the pH of the equivalence point. (3bii) Different acid–base combinations have different pH values at the end point. An indicator must change colour within the pH range where the equivalence point occurs. Therefore, the chosen indicator must have a colour change interval that matches the pH jump of the titration. (3ci) Concordant titre values are two or more titre values that are very close to each other (usually within 0.1 cm³), indicating consistent and reliable titration results. (3cii) The final burette reading is recorded above the initial reading to account for the volume of liquid delivered and to avoid negative values or confusion in volume calculation. (3ciii) A burette filled with aqueous NaOH must be washed thoroughly after use to remove any residue that could react with the next solution used or affect accuracy in subsequent titrations. (3di) SO₂ (3dii) HNO₃

*WAEC GCE CHEMISTRY PRACTICAL* *NUMBER ONE* (1ai) To calculate the concentration of KMnO₄ solution in moldm⁻³, you'll need to use the titration data and the balanced equation. First, calculate the moles of FeSO₄ used in the titration. Then, use the stoichiometry of the reaction to find the moles of KMnO₄ that reacted. Finally, calculate the concentration of KMnO₄. (1aii) To calculate the concentration of FeSO₄ solution in gdm⁻³, you'll need to use the mass of FeSO₄ dissolved and the volume of the solution. (1b) To determine the value of x in the hydrated salt (FeSO₄·xH₂O), you'll need to use the mass of the hydrated salt, the molar mass of FeSO₄, and the molar mass of water. Calculate the moles of FeSO₄ and the moles of water, then determine the ratio of water to FeSO₄. (1c) It is not advisable to acidify the KMnO₄ solution with HNO₃ because HNO₃ is a strong oxidizing agent and can react with the KMnO₄, leading to inaccurate results.

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WAEC GCE 2025 CHEMISTRY ANSWERS👇🏻👇🏻

*WAEC GCE CHEMISTRY OBJ* 1. B — hygroscopic. (CaCl₂ is used as a desiccant because it absorbs moisture.) 2. A — Fructose. (Fructose is a monosaccharide; the others are disaccharides.) 3. C — molecule. (A molecule is the smallest particle that retains the chemical properties.) 4. C — 2,2,4-trimethylpentane. (Structure corresponds to CH₃–C(CH₃)₂–CH₂–CH(CH₃)–CH₃.) 5. A — working capital. (Siting concerns are physical/locational; working capital is a financial factor.) 6. C — sublimation. (Conversion from solid to gas.) 15. The silver halides are all insoluble in water except ✔ A. AgF AgF is soluble; AgCl, AgBr, and AgI are insoluble. 16. The oxidation number of chromium in Cr₂O₇²⁻ is ✔ B. +6 Let oxidation state of Cr = x: 2x + 7(–2) = –2 → 2x – 14 = –2 → 2x = 12 → x = +6. 17. Which of the following statements is correct? ✔ B. ΔH₁ < ΔH₂ Formation of water releases more energy (more exothermic) than formation of hydrogen peroxide. 18. At the endpoint of a strong acid vs strong base titration, the solution is ✔ C. neutral pH ≈ 7. 19. The following substances are covalent solids except ✔ D. CuO CuO is ionic; the others form covalent networks. 20. Amount of sodium in 53 g Na₂CO₃ Molar mass = 106 g/mol 53 g = 0.5 mol Na₂CO₃ → Na atoms = 2 × 0.5 = 1.0 mol ✔ D. 1.00 mol 21. Gases have high compressibility because the molecules ✔ B. are widely spaced. 22. The minimum energy required for a reaction to take place is ✔ A. activation energy More coming

*WAEC GCE CHEMISTRY* *NUMBER TWO* (2ai) A transition element is a d-block element that has an atom or ion with an incomplete d-subshell. (2aii) (α) Coloured compound formation: Transition metals form coloured compounds due to d-d electron transitions within the partially filled d-orbitals when they absorb certain wavelengths of light. (β) Complex ion formation: Transition metals can form complex ions by bonding with ligands due to their ability to use empty d orbitals for coordinate covalent bonding. (γ) Catalytic abilities: Transition metals act as catalysts because they can change oxidation states easily and provide a surface for reactants to adsorb, lowering activation energy. (2bi) (α) Potassium and oxygen: K₂O (β) Sulphur and aluminium: Al₂S₃ (γ) Nitrogen and magnesium: Mg₃N₂ (2bii) K₂O: Potassium oxide Al₂S₃: Aluminium sulphide Mg₃N₂: Magnesium nitride (2ci) (α) Atom An atom is the smallest particle of an element that can exist alone and retains the chemical properties of that element; it consists of a nucleus (protons and neutrons) surrounded by electrons. (β) Molecule A molecule is a neutral group of two or more atoms chemically bonded together, representing the smallest particle of a substance that can exist while retaining its chemical identity. (γ) Ion An ion is an atom or group of atoms that has acquired a net electrical charge by losing or gaining electrons. (2cii) Atom: Cl (chlorine atom) Molecule: Cl₂ (chlorine molecule) Ion: Cl⁻ (chloride ion)

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