Q1: Tip of the match stick contains a mixture of

ANS:C - S + K₂Cr₂O₇ + White P

The tip of a matchstick typically contains a mixture of chemicals designed to ignite when struck against a rough surface. These chemicals include:

1. Phosphorus: Phosphorus is a key component of the ignition mixture. It is usually present in the form of white phosphorus or red phosphorus. When the matchstick is struck against a rough surface, friction causes the phosphorus to ignite.
2. Potassium chlorate: Potassium chlorate is a powerful oxidizing agent that helps to sustain the combustion reaction initiated by the phosphorus. It provides the necessary oxygen for the combustion process to occur.
3. Sulfur: Sulfur is sometimes added to the mixture to help promote ignition and sustain the combustion process.

Other minor additives may also be included in the mixture to enhance ignition performance, stabilize the mixture, or control the burning rate. When the matchstick is struck against a rough surface, the friction generates enough heat to ignite the phosphorus, which then reacts with the potassium chlorate, releasing additional heat and sustaining the combustion process. This creates a flame at the tip of the matchstick, allowing it to be used for lighting candles, stoves, or other combustible materials.