Test: Calcium & its Compounds - JAMB MCQ

Alkaline-earth metals include elements such as calcium, magnesium, strontium, barium, and radium.

Quicklime is another name for calcium oxide (CaO), which is obtained by heating calcium carbonate.

Calcium hydroxide has the chemical formula Ca(OH)₂, where calcium is combined with two hydroxide ions.

Alkaline-earth metals are relatively soft and malleable, which means they can be easily shaped or bent without breaking.

Calcium trioxocarbonate (IV) is commonly known as chalk. It is a soft, white sedimentary rock composed mainly of calcium carbonate.

Calcium oxide is a key ingredient in the production of cement. It reacts with water to form calcium hydroxide, which is used in the cement-making process.

Calcium oxide is commonly prepared from sea shells by a process called slaking. The shells are dissolved in water, resulting in the formation of calcium hydroxide.

When calcium carbonate (CaCO₃) is heated, it undergoes thermal decomposition and releases carbon dioxide gas (CO₂), leaving behind calcium oxide.

Alkaline-earth metals have two valence electrons in their outermost energy level, resulting in the electron configuration ns².

When calcium oxide reacts with water, it forms calcium hydroxide. The balanced chemical equation is CaO + H₂O → Ca(OH)₂.