Question

The valency of calcium is two and that of oxygen is two. Write down the molecular formula of calcium oxide​

Answer 1

Answer:

Since Calcium oxide is a neutral compound so the charge on Oxygen should be -2. Valency of Oxygen is 2, so a single Oxygen atom can satisfy the need. Therefore formula is CaO.

Answer 2

Answer:

Calcium oxide, commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. The broadly used term "lime" connotes calcium-containing inorganic materials, in which carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate. By contrast, quicklime specifically applies to the single chemical compound calcium oxide. Calcium oxide that survives processing without reacting in building products such as cement is called free lime.

Chemical formula: CaO

Melting point: 2,572°C (4,662°F)

Density: 3.34 g/cm³

Average Molar mass: 56.08 g/mol

Boiling point: 2,850°C (5,162°F)

IUPAC ID: Calcium oxide

Explanation:

Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO. Calcium oxide, also known as quicklime, is an alkaline substance that has been in use since the medieval age. It is believed that quicklime is one of the oldest chemicals known to the human race. It can also be referred to as burnt lime or lime.

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