Match each common calcium compound on the left with its correct chemical name, formula, an… — JAMB UTME

Match each common calcium compound on the left with its correct chemical name, formula, and primary application on the right.

QuicklimeCalcium oxide ( $\text{CaO}$ ), used as a drying agent for basic gases such as ammonia
Slaked limeCalcium hydroxide ( $\text{Ca(OH)}_2$ ), used in agriculture for neutralizing soil acidity
GypsumCalcium tetraoxosulfate(VI) dihydrate ( $\text{CaSO}_4 \cdot 2\text{H}_2\text{O}$ ), added to cement to retard setting
Plaster of ParisCalcium tetraoxosulfate(VI) hemihydrate ( $\text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O}$ ), used in medicine for setting fractured bones

Quicklime matches Calcium oxide (

\text{CaO}

); Slaked lime matches Calcium hydroxide (

\text{Ca(OH)}_2

); Gypsum matches Calcium tetraoxosulfate(VI) dihydrate (

\text{CaSO}_4 \cdot 2\text{H}_2\text{O}

); Plaster of Paris matches Calcium tetraoxosulfate(VI) hemihydrate (

\text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O}

Each calcium compound is accurately paired with its chemical formula and practical use: Quicklime (

\text{CaO}

) as a drying agent for basic gases, Slaked lime (

\text{Ca(OH)}_2

) for soil liming, Gypsum (

\text{CaSO}_4 \cdot 2\text{H}_2\text{O}

) for retarding cement setting, and Plaster of Paris (

\text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O}

) for surgical casts.

Identify the chemical composition of Quicklime and Slaked lime

Quicklime is

\text{CaO}

(calcium oxide) and Slaked lime is

\text{Ca(OH)}_2

(calcium hydroxide).

Thermal decomposition of limestone (

\text{CaCO}_3

) yields

\text{CaO}

, which reacts with water to form

\text{Ca(OH)}_2

Distinguish between Gypsum and Plaster of Paris based on hydration state

Gypsum contains two water molecules per sulfate unit (

\text{CaSO}_4 \cdot 2\text{H}_2\text{O}

), whereas Plaster of Paris contains half a water molecule per sulfate unit (

\text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O}

Heating gypsum to around

120^\circ\text{C}

removes three-quarters of its crystallization water to form Plaster of Paris.

Correlate each compound with its characteristic industrial application

Quicklime dries ammonia gas, Slaked lime neutralizes acidic soil, Gypsum regulates cement setting time, and Plaster of Paris forms orthopedic casts.

Chemical properties direct specific industrial uses as specified in standard JAMB UTME chemistry syllabus guidelines.

Nomenclature, formulas, and practical applications of major calcium compounds.

Estimated Time:45s

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