Chemical formula of quick lime is __________.

CaO

The correct answer is option 1. CaO.

The chemical formula for quick lime is CaO.

Here's why:

Quick lime: This common name refers to calcium oxide, a chemical compound formed by one calcium atom (Ca) bonded to one oxygen atom (O).

Formula breakdown:

Ca: Represents one calcium atom.

O: Represents one oxygen atom.

Combining these elements with their respective subscript numbers, we get the formula CaO.

The other options you provided are:

\(CO_2\): This formula represents carbon dioxide, a completely different molecule with one carbon atom and two oxygen atoms.

\(CaCO_3\): This formula represents calcium carbonate, also known as limestone, another distinct compound commonly found in rocks and seashells.

\(Ca(OH)_2\): This formula represents slaked lime, which is calcium hydroxide. It is formed by the reaction of quick lime \((CaO)\) with water \((H_2O)\).