What is quicklime? Write one use of quicklime.

Hint: Quicklime is thought to be one of the oldest compounds ever discovered by humans. Burnt lime or lime are other names for it. Calcium oxide has a medium viscosity, a high surface tension, and a fast to medium rate of expansion and contraction. At ceramic temperatures, this substance isn't volatile. Calcium oxide has a moderate effect on colour, unless it's used in big numbers, in which case it can bleach iron oxide. It comes in a variety of colours, including kaki/tomato reds.

Complete answer:
Quicklime: Calcium oxide ( \[CaO\] ), commonly known as quicklime or burnt lime, is a widely used chemical compound. At room temperature, it is a white, caustic, alkaline, crystalline solid. The name "lime" refers to calcium-containing inorganic compounds that are mostly composed of carbonates, oxides, and hydroxides of calcium, silicon, magnesium, aluminium, and iron. Quicklime, on the other hand, refers to the single chemical molecule calcium oxide.
Calcium Oxide's Applications
-It's widely used for medicinal and pesticide applications.
-It's used in the production of cement, paper, and high-grade steel, among other things.
-In laboratories, lime is used as a reagent for dehydration, precipitation reactions, and other procedures.
-It is the cheapest alkali accessible, and it is a key component in the production of caustic soda.
-Calcium is necessary for animal life because it is found in bones, shells, and teeth.
-Calcium carbonate is the most prevalent calcium compound, and it is used by potters as a source of calcium oxide for glazes.

Note:
 Quicklime produces significant irritation when inhaled or when it comes into touch with moist skin or eyes due to its strong reactivity with water. Coughing, sneezing, and difficulty breathing may occur after inhalation. Burns with rupture of the nasal septum, abdominal pain, nausea, and vomiting may follow. Although quicklime is not a fire threat, its reaction with water can provide enough heat to ignite flammable items.