Chemistry

12th

grade

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T/B REDOKS DALAM KAKISAN LOGAM/ PENGARATAN BESI

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  • 1. Multiple Choice
    30 seconds
    1 pt
    Image

    The diagram shows the mechanism of rust formation.

    Gambar rajah menunjukkan mekanisme pembentukan karat.


    Which of the following statements is true about this mechanism?

    Antara pernyataan berikut yang manakah benar mengenai mekanisme ini?

    An iron atom releases two electrons to form an iron(II) ion

    Satu atom ferum membebaskan dua elektron membentuk satu ion ferum(II)

    An iron(II) ion receives two electrons from an iron atom

    Satu ion ferum(II) menerima dua elektron daripada satu atom ferum

    An oxygen molecule receives two electrons to form a hydroxide ion

    Satu molekul oksigen menerima dua elektron untuk membentuk satu ion hidroksida

    Four hydroxide ions are formed when two water molecules receive four electrons

    Empat ion hidroksida terbentuk apabila dua molekul air menerima empat elektron

  • 2. Multiple Choice
    30 seconds
    1 pt
    Image

    The diagram shows the rusting process of iron.

    Rajah menunjukkan proses pengaratan besi.


    Which of the following equations occurs at the cathode?

    Antara persamaan berikut, yang manakah berlaku di katod?

    Fe → Fe2+ + 2e

    Fe2+ + 2e → Fe

    O2 + 2H2O + 4e → 4OH

    4OH → O2 + 2H2O + 4e

  • 3. Multiple Choice
    30 seconds
    1 pt

    Which of the following metal can prevent rusting when it is in contact with iron?

    Antara logam berikut, manakah yang dapat mencegah pengaratan apabila bersentuh dengan besi?

    Lead

    Plumbum

    Silver

    Argentum

    Copper

    Kuprum

    Aluminium

    Aluminium

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