2015 · Q22
Red phosphorus is used in the manufacture of safety matches. This is due to the fact that
General KnowledgeChemistry
- Ait shows phosphorescence
- Bat ordinary temperature, it is less reactive than other varieties of phosphorus
- Cit cannot be converted to white phosphorus oh heating
- Dit does not react with halogen on heating
Explanation
Safety matches use red phosphorus on the striking surface because red phosphorus is stable and far less reactive at ordinary temperatures than white phosphorus, which ignites spontaneously in air and is highly poisonous. This low room-temperature reactivity makes it safe to handle and store. Phosphorescence is irrelevant, and red phosphorus does react with halogens on heating, so B is the decisive property.