What is the meaning of a redox reaction?

Apakah maksud tindak balas redoks?

• Reduction reaction involved gain of electron.

  Tindak balas penurunan melibatkan penerimaan elektron.

• Oxidation reaction involved loss of electron.

  Tindak balas pengoksidaan melibatkan kehilangan elektron.

• Both oxidation and reduction reaction occurred simultaneously

  Kedua-dua tindakbalas penurunan dan pengoksidaan yang berlaku serentak.

• A reaction involved gaining electron and losing hydrogen.

  Tindak balas melibatkan penerimaan elektron dan kehilangan hidrogen.

Which of the following statements refer to oxidation?

Pernyataan yang manakah merujuk kepada pengoksidaan?

I Process of losing oxygen

Proses kehilangan oksigen

II Process of gaining hydrogen

Proses penerimaan hidrogen

III Process of losing electrons

Proses kehilangan elektron

IV Process of increasing oxidation number

Proses penambahan nombor pengoksidaan

• I and II only

• III and IV only

• I, II and III only

• I, II , III and IV

Which of the following is a redox reaction?

Antara berikut yang manakah tindak balas redoks?

• Na₂O + H₂O → 2NaOH

• NaOH + HCl → NaCl + H₂O

• 2Na + 2H₂O → 2NaOH + H₂

• NaCl + AgNO₃ → AgCl + NaNO₃

The ionic equation shows a redox reaction.

Persamaan ion berikut menunjukkan tindak balas redoks.

P (s) + Q²⁺(aq) → P²⁺ (aq) + Q (s)

Which of the following statement is true?

Manakah antara pernyataan berikut adalah benar?

• Q²⁺ is oxidized.

  Q²⁺ dioksidakan

• P donates electrons

  P menderma elektron

• P is an oxidizing agent

  P adalah agen pengoksidaan

• Q²⁺ is a reducing agent

  Q²⁺ adalah agen penurunan

Which of the following represents the oxidation number of nitrogen in the various oxides of nitrogen?

Manakah antara berikut dapat mewakili nombor pengoksidaan bagi nitrogen di dalam pelbagai oksida nitrogen?

• A

• B

• C

• D

What is the oxidation number of X in X₂O₃^2- ion?

Apakah nombor pengoksidaan bagi X dalam ion X₂O₃^2- ?

• +2

• +4

• -2

• -4

What are halogens X, Y and Z?

Apakah halogen X, Y dan Z?

• A

• B

• C

• D

Fe³⁺ ion in solution can be converted to Fe²⁺ ions by adding zinc powder. Which of the following can replace zinc powder in this reaction?

Ion Fe³⁺dalam larutan boleh ditukarkan kepada ion Fe²⁺ dengan menambahkan serbuk zink. Antara berikut, yang manakah boleh menggantikan serbuk zink di dalam tindak balas ini?

• Bromine water

  Air Bromin

• Potassium iodide solution

  Larutan kalium iodida

• Potassium hexacynaferrate(II) solution

  Larutan kalium heksasianoferat (II)

• Acidified potassium manganate (VII) solution

  Larutan kalium manganat (VII) berasid

The following equation shows the redox reaction between copper and silver nitrate solution.

Persamaan berikut menunjukkan tindak balas redok antara kuprum dengan larutan argentum nitrat.

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

Which of the following statements is true about this reaction?

Antara pernyataan berikut, yang manakah benar mengenai tindak balas ini?

• Silver ion is oxidized

  Ion argentum dioksidakan

• Copper is the oxidizing agent

  Kuprum adalah agen pengoksidaan

• The oxidation number of copper increases

  Nombor pengoksidaan kuprum bertambah

• The oxidation number of nitrogen decreases

  Nombor pengoksidaan nitrogen berkurang

The figure shows a chemical cell

Rajah menunjukkan satu sel kimia.

The reaction that occurs is given by the equation:

Tindak balas yang berlaku ditunjukkan melalui persamaan berikut :

Zn (s) + CuSO₄ (aq) → ZnSO₄ (aq) + Cu (s)

Which of the following is correct about the cell?

Manakah antara berikut adalah benar tentang sel tersebut?

• Hydrogen gas is produced.

  Gas hidrogen terhasil

• Zinc is oxidized to zinc ion, Zn²⁺

  Zink dioksidakan kepada ion zink, Zn²⁺

• Copper is oxidized to copper(II) ion, Cu²⁺

  Kuprum dioksidakan kepada ion kuprum, Cu²⁺

• Electrons flow from the copper plate to the zinc plate.

  Elektron bergerak daripada plat kuprum kepada plat zink