hamburger menu
All Coursesall course arrow
adda247
reward-icon
adda247
    arrow
    arrow
    arrow
    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.

    test-prime-package

    Access ‘State Judiciary PCS J’ Mock Tests with

    • 60000+ Mocks and Previous Year Papers
    • Unlimited Re-Attempts
    • Personalised Report Card
    • 500% Refund on Final Selection
    • Largest Community
    students-icon
    354k+ students have already unlocked exclusive benefits with Test Prime!
    test-prime-package

    Access ‘State Judiciary PCS J’ Mock Tests with

    • 60000+ Mocks and Previous Year Papers
    • Unlimited Re-Attempts
    • Personalised Report Card
    • 500% Refund on Final Selection
    • Largest Community
    students-icon
    354k+ students have already unlocked exclusive benefits with Test Prime!
    Our Plans
    Monthsup-arrow