Q97 / 270 · NDA 2016 (Phase 2) · General Ability

When one strikes a safety mat, the first step is

A
burning of sulfur
B
decomposition of potassium chlorate into potassium chloride and oxygen
Correct answer
C
conversion of a small amount of red phosphorus into white phosphorus
D
burning of glue and starch

Solution

If we rub the match stick against the striking surface, the friction generated causes some of the red phosphorus present to turn into white phosphorus. White phosphorus is highly sensitive and volatile, it ignites spontaneously in the air, making a flame.

Hence, the correct answer is option: 'C'.

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