ANS:C - tip of match sticks

The tip of matchsticks, also known as the match head, contains a mixture of chemicals designed to ignite when struck against a rough surface, such as the striking surface on the matchbox. The composition of the match head may vary depending on the type of matchstick, but it typically includes the following components:

1. Potassium Chlorate (KClO3): Potassium chlorate is a key ingredient in the match head composition. It serves as the primary oxidizing agent, providing oxygen to support the combustion reaction. When the matchstick is struck against the striking surface, friction generates enough heat to ignite the potassium chlorate, initiating the combustion process.
2. Sulfur (S): Sulfur is another essential component of the match head composition. It acts as a fuel, contributing to the overall combustion process and sustaining the flame once ignited. Sulfur helps ensure that the matchstick continues to burn steadily after ignition.
3. Antimony Sulfide (Sb2S3): Antimony sulfide is often added to match heads to enhance their combustion properties. It helps stabilize the flame and improve the match's overall performance by promoting uniform combustion and reducing the risk of extinguishment.
4. Binding Agent: A binding agent, such as starch or glue, is used to hold the mixture of chemicals together and adhere it to the matchstick's wooden stem. The binding agent ensures that the match head remains intact and securely attached to the matchstick until it is struck against the striking surface.
5. Colorants and Additives: Depending on the manufacturer and the desired properties of the matchstick, additional colorants, fillers, and additives may be included in the match head composition. These components can affect the match's appearance, burning characteristics, and overall performance.

When the matchstick is struck against the striking surface, the friction generates heat, causing the potassium chlorate and sulfur mixture in the match head to ignite. The ignited match head then produces a flame, which can be used to ignite combustible materials such as paper, wood, or candles.