The head of a matchstick containss a mixture of antimony trisulphide, potasium chlorate, starch and some glue. For combustion, it is struck against a rough surface made of powedered glass and red phosphorous. Which of the following substances will be the first to get ignited when the match is struck against a rough surface?

The heat generated by friction when the match is struck on the side of the box contains red phosphorous, binder and powdered glass causes a minute amount of red phosphorous to be converted to white phosphorous, which ignites spontaneously in air. This sets off the decomposition of potassium chlorate to give oxygen and potassium chloride. The sulphur catches fire and ignites the wood.