IGCSE Redox reactions

Which row correctly describes oxidation in terms of oxygen, electrons and oxidation state?

• A

• B

• C

• D

Answer explanation

loss of electron is oxidation

gaining/adding oxygen is oxidation

Tags

NGSS.HS-PS1-7

Magnesium reacts with iron(III) oxide in the following reaction.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

Lead(II) oxide undergoes a number of different redox reactions. In which of the following reactions is lead(II) oxide,PbO, not reduced?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-7

The following equations are all examples of redox reactions. In which equation is the underlined substance being oxidised?

• A

• B

• C

• D

Three reactions are shown below.

NO+O₃ →NO₂ +O₂

2C +O₂ → 2CO

2MgO+O₂ → 2MgO

Which row correctly describes the process each reactant molecule undergoes?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

Which row correctly describes the process of reduction in terms of oxygen, electrons, and oxidation state?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

A series of redox reactions are shown.What is the oxide that undergoes oxidation?

2CO+2NO→ 2CO₂ +N₂

Fe₂O₃ +2Al → Al₂O₃ +2Fe

2ZnO+C → 2Zn +CO₂

Fe₂O₃ +3CO→ 2Fe+3CO₂

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

In which reaction is the reactant being reduced?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

Which row correctly describes an oxidising agent and a reducing agent?

• A

• B

• C

• D

Hydrogen and copper(II) oxide react to produce copper metal and water.

CuO + H₂ → Cu +H₂O Which row correctly describes the oxidising agent and reducing agent?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2