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When kept in air, which of the following elements glows in dark?
Question

When kept in air, which of the following elements glows in dark?

A.

Platinum

B.

Strontium

C.

White phosphorus

D.

Red phosphorus

Correct option is C

White phosphorus is a highly reactive form of phosphorus that glows in the dark due to a phenomenon known as chemiluminescence. When exposed to oxygen, it undergoes slow combustion and emits a faint greenish glow. This property is also the reason it is stored underwater or in an inert atmosphere to prevent it from spontaneously igniting.

(a) Platinum: A precious metal, but it does not glow in the dark.
(b) Strontium: It is used in pyrotechnics but does not glow in air.
(d) Red phosphorus: This is a more stable form of phosphorus and does not glow in air like white phosphorus.

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