Y10 ASC redox reactions quiz

What does the oxidation state of an atom in a substance indicate?

• The degree of oxidation or reduction.
• The number of protons in the atom.
• The number of neutrons in the atom.
• The total number of electrons in the atom.

In the formation of NaCl, Sodium (Na) ___.

• Loses an electron and is oxidised.
• Gains an electron and is reduced.
• Neither gains nor loses an electron.
• Gains a proton and is reduced.

Which one is the correct name for a compound where iron has an oxidation state of +3?

• Iron (III) oxide.
• Iron (II) oxide.
• Iron (I) oxide.
• Iron (IV) oxide.

In a combustion reaction, oxygen typically ___.

• Gains electrons and is reduced.
• Loses electrons and is oxidised.
• Neither gains nor loses electrons.
• Loses protons and is oxidised.

In a displacement reaction, the element that is displaced ___.

• Gains electrons and is reduced.
• Loses electrons and is oxidised.
• Neither gains nor loses electrons.
• Loses protons and is oxidised.

What type of bond is formed when sodium (Na) loses an electron to chlorine (Cl)?

• Ionic bond.
• Covalent bond.
• Hydrogen bond.
• Metallic bond.

What is the oxidation state of an atom in a pure substance?

• 0
• 1
• -1
• 2

If an element has a negative oxidation state in a compound, it ___.

• Gained electrons and was reduced.
• Lost electrons and was oxidised.
• Neither gained nor lost electrons.
• Gained protons and was reduced.

In a redox reaction, the substance that loses electrons is ___.

• Oxidised.
• Reduced.
• Neither oxidised nor reduced.
• Both oxidised and reduced.

In terms of electron transfer, reduction involves ___.

• The gain of electrons.
• The loss of electrons.
• No change in electrons.
• Both the gain and loss of electrons.