Explanation

(a) Maior element contained in specimens A, B, C

• Specimen A -  Potassium
• Specimen B - Carbon
• Specimen C - Calcium

b) Uses of specimens A and B

Specimen A;

• It can be used as fertilizer
• It is a component of some fertilizer types
• Used in correcting soil acidity
• Used in controlling pests
• Important in the manufacture of soap
• Its leachates are Used in dye making
• Used as Scouring powder
• Sometimes added to compost manure when preparing it.

Specimen B;

• May be used in driving heat engines
• A source of heat for roasting/drying farm produce
• For warming brooder and piglet houses
• For boiling of water for processing of produce e.g palm oil production
• For purification of some compounds e.g. sugar
• Used as a toxin-binder/remover in feeds
• For goldsmithing and blacksmithing
• Soil sterilization when used to provide steam

(c) Ways in which specimen C is important in agriculture

• Used .in decreasing soil acidity:
• Used in decreasing fishpond water acidity
• Increases availability of soil nutrients when added
• It is a component of animal feed
• For controlling leeches in fish ponds:
• For controlling liver fluke by preventing hatching of water snail
• Reduces turbidity in fish ponds
• Increases activitíes of soil organism
• Improves soil structure.

(d) Description of physical differences between Specimen B and C;

• Specimen B is black in colour while specimen C is creamy/white! light grey in colour
• Specimen C has distinct crystals and layers while specimen B does not have.
• Specimen B is amorphous while specimen C is crystalline
• Specimen C is harder than specimen B
• Specimen C is heavier than Specimen B

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