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*JUPEB ANSWERS* (5ai) Ca + 2H₂O --> Ca(OH)₂ + H₂ Sr + 2H₂O --> Sr(OH)₂ + H₂ Ba + 2H₂O --> Ba(OH)₂ + H₂ Mg + 2H₂O --> Mg(OH)₂ + H₂ Beryllium does not react with water (5aii) Reactivity with water increases down the group, from Beryllium (does not react) to Barium (reacts vigorously): Be < Mg < Ca < Sr < Ba. This is because ionisation energy decreases down the group as atomic radius increases, so the outer electrons are lost more readily. (5bi) (i) their ions are small with a high charge density, which strongly attracts ligands (ii) they have partially filled d-orbitals that are empty enough to accept lone pairs of electrons donated by ligands, forming dative (coordinate) bonds. (5bii) Transition metal complexes are coloured because their partially filled d-orbitals split into two sets of different energy levels in the presence of ligands. Electrons can absorb energy from visible light and jump (be excited) from the lower d-orbital set to the higher one; the colour seen is the complementary colour to the light absorbed. (5ci) Acid rain is rain (or any precipitation) that has a pH lower than normal, usually below 5.6, due to dissolved acidic gases such as sulphur dioxide and oxides of nitrogen, which form sulphuric acid and nitric acid in the atmosphere. (5cii) Trees: Acid rain damages leaves and needles, leaches essential nutrients such as calcium and magnesium from the soil, and releases toxic aluminium ions into the soil, weakening trees and stunting their growth. Fish: Acid rain lowers the pH of lakes and rivers, which can damage fish gills, disrupt reproduction, and, in severe cases, kill fish directly or through the toxic aluminium it releases from surrounding soil. Building materials: Acid rain reacts with and corrodes limestone and marble (calcium carbonate) used in buildings and statues, and also corrodes metal structures, gradually wearing away the material.

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JUPEB 2026 FINAL EXAMINATION TIMETABLE WEEK I – MCQ/CBT/PRACTICAL Monday, 3rd August 2026 Briefing Session 8:30am – 9:30am Economics (MCQ/CBT) 11:30am – 12:30pm Economics / Yoruba / Igbo / Music 1:30pm – 2:30pm Agricultural Science 3:00pm – 4:00pm Accounting / Agricultural Science 4:30pm – 5:30pm =========================== Tuesday, 4th August 2026 Physics (MCQ/CBT) 10:00am – 11:00am Physics / History 1:30pm – 2:30pm Government 3:00pm – 4:00pm =========================== Wednesday, 5th August 2026 Chemistry (MCQ/CBT) 10:00am – 11:00am Chemistry 1:30pm – 2:30pm Business Studies 3:00pm – 4:00pm Literature 4:30pm – 5:30pm =========================== Thursday, 6th August 2026 Biology / French 8:30am – 9:30am Biology / Visual Arts 10:00am – 11:00am Biology / Geography 11:30am – 12:30pm Mathematics 1:30pm – 2:30pm Mathematics / CRS / ISS 4:30pm – 5:30pm =========================== Friday, 7th August 2026 Physics Practical French Practical ======================== WEEK II – ESSAY/PRACTICAL Monday, 10th August 2026 Yoruba / Igbo Essay 8:00am – 10:00am History / Agricultural Science Essay 10:30am – 12:30pm Physics Essay 1:00pm – 3:00pm French / Music Essay 3:30pm – 5:30pm =========================== Tuesday, 11th August 2026 Chemistry Essay 8:00am – 10:00am CRS / ISS / Business Studies Essay 10:30am – 12:30pm Mathematics Essay 1:00pm – 3:00pm Government Essay 3:30pm – 5:30pm =========================== Wednesday, 12th August 2026 Biology / Geography Essay 8:00am – 10:00am Literature / Accounting Essay 10:30am – 12:30pm Economics / Visual Arts Essay 3:30pm – 5:30pm =========================== Thursday, 13th August 2026 Chemistry Practical Music Practical Agricultural Science Practical Visual Arts Practical =========================== Friday, 14th August 2026 Biology Practical ===========================