iGCSE redox basics

What is oxidation in terms of electron transfer?

• Gain of electrons

• Loss of electrons

• No change in electrons

• Sharing of electrons

Which of the following is a redox reaction?

• Zinc (Zn)

• Copper (Cu)

• Sulphate (SO_4)

• Zinc sulphate (ZnSO_4)

Which of the following statements is true about reduction?

• It involves the gain of oxygen.

• It involves the loss of electrons.

• It involves the gain of electrons.

• It involves the loss of hydrogen.

• Magnesium (Mg)

• Oxygen (O_2)

• Magnesium oxide (MgO)

• None of the above

What is the term used for a substance that donates electrons in a redox reaction?

• Oxidising agent

• Reducing agent

• Catalyst

• Inhibitor

Which of the following is an example of a reduction reaction?

• Potassium (K)

• Bromine (Br_2)

• Potassium bromide (KBr)

• None of the above

What happens to a substance that is oxidised in a redox reaction?

• It gains electrons

• It loses electrons

• It gains oxygen

• It loses oxygen

Which of the following best describes a redox reaction?

• A reaction where only oxidation occurs

• A reaction where only reduction occurs

• A reaction where both oxidation and reduction occur

• A reaction where no electron transfer occurs