JAMB - Chemistry (1992 - No. 33)
Safety matches contain sulphur and the following except?
sodium chloride
potassium trioxonitrate (V)
charcoal
phosphorus sulphide
Explicaţie
Modern safety matches usually have antimony sulfide, oxidizing agents such as potassium chlorate, and sulfur or charcoal in the heads, and red phosphorus in the striking surface.