THE UNKNOWN SOLUTION TEAM

(1ai) Cooperative farming: (i)Enables farmers to pool resources, reducing costs and increasing bargaining power. (ii)Facilitates the sharing of knowledge and technologies among farmers. (iii)Enhances access to markets for members, improving sales and incomes. (1aii) Farm settlement scheme: (i)Provides land and resources to new farmers, helping to establish new agricultural ventures. (ii)Encourages the establishment of agricultural communities, fostering collaboration and mutual support. (iii)Offers training and development programs, raising farming standards and efficiency. (1aiii) Agricultural research institute: (i)Conducts research on new agricultural techniques and technologies. (ii)Develops new crop varieties that are more resistant to pests and diseases, boosting yields. (iii)Provides extension services to farmers, disseminating knowledge and innovations. (1b) (i) Dibber: A tractor-mounted planter or seed drill. (ii) Hoe: A cultivator or tiller attachment. (iii) Sickle: A mower or a sickle bar mower attachment. (iv) Wheelbarrow: A front-end loader or a utility cart attachment. (v) Watering can: An irrigation system or sprayer attachment. (1c) (i) It efficiently turns over the upper layer of the soil, bringing fresh nutrients to the surface while burying weeds and the previous crop's residues. (ii) The plough helps in creating a cleaner and more even seedbed for planting. (1cii) (i)it can lead to soil erosion. When the soil is turned over. (ii)it exposes the lower layers to the elements, which can be particularly detrimental in areas susceptible to wind or water erosion.

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QUESTION 2 (2a) When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained. Observations: The residue: This will contain the insoluble salt(s) present in C. The filtrate: This will contain the soluble salt(s) present in C. (2bi) Heating about 2cm³ of the filtrate in a boiling tube strongly. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate. The gas evolved is likely carbon dioxide (CO₂). (2bii) Adding dilute HCl to half of the residue in a test tube. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue. The gas evolved is likely carbon dioxide (CO₂). (2biii) Adding aqueous NaOH in drops, then in excess, to about 2cm³ Observations: If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution. (2biv) Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (ii). Observations: If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution.

*2024 WAEC CHEMISTRY PRACTICAL ANSWERS* *NUMBER THREE* (3a) (PICK TWO) (i ) Carbon dioxide (CO2) (ii) Ammonia (NH3) (iii) Oxygen (O2) (iv)Hydrogen chloride (HCl) (3b) (PICK TWO) (ii) Burette (iii) Volumetric flask (iv) Micropipette (3c)    Safely contain and remove harmful fumes, gases, or vapors generated during experiments, preventing their exposure to lab personnel. (3d) (PICK THREE) (i) Safety goggles/glasses (ii) Lab coat/apron (iii) Gloves (iv)Face mask/respirator (v) Closed-toe shoes/footwear (vi) Ear protection (if needed for specific experiments or environments)

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