Abuja — The West African Examinations Council (WAEC) has postponed the full implementation of the computer-based test (CBT) format for the 2026 Senior School Certificate Examination (SSCE) until 2027, according to a statement released at the council’s 63rd annual meeting in Umuahia, Abia State. Hajia Binta Abdulkadir, Chairman of WAEC’s Nigeria National Committee, explained that the 2026 May/June edition will now serve as a pilot phase — allowing candidates to sit for either the traditional paper-and-pen test or the digital format. She emphasized that no student will be disadvantaged by the transition. The delay follows widespread concern over the readiness of many schools, particularly in rural areas, for full digital exams. Many institutions lack adequate computers, reliable electricity, internet connectivity, and trained personnel—factors WAEC and the Federal Ministry of Education say are essential for a successful rollout. To facilitate the switch, WAEC co...
In a qualitative analysis of ions like lead, zinc ions and aluminium ions, these ions show similar reactions with dilute sodium hydroxide solution. They produce white precipitates with a few drops of dilute sodium hydroxide solution, which are soluble in excess dilute sodium hydroxide solution. In this article, you will learn how to separate lead ions from a mixture of aluminium ions and zinc ions. Before I go ahead, let me list some reagents that are necessary for the tests: Aqueous ammonia Dilute hydrochloric acid Potassium dichromate solution Potassium iodide solution Step one: separation of zinc ions from the mixture To the solution of the unknown compounds, add a few drops of aqueous ammonia, and the formation of white gelatinous precipitate that dissolves in excess aqueous ammonia removes lead ions and aluminium ions as an insoluble compound in the excess aqueous ammonia while zinc remains in the solution. Step two: separation of aluminium ions fr...