Redox Reactions

H⁺ (aq) + OH^- (aq) → H₂O (l) is a redox reaction.

• True

• False

2H⁺ (aq) + MgCO₃ (s) → Mg²⁺ (aq) + CO₂ (g) + H₂O (l) is a redox reaction.

• True

• False

2H⁺ (aq) + Mg (s) → Mg²⁺ (aq) + H₂ (g) is a redox reaction.

• True

• False

Ag⁺ (aq) + Cl ^-(aq) →AgCl (s) is a redox reaction.

• True

• False

The oxidation state of which element is decreased?

Mg + ZnF₂ → Zn + MgF₂

• Mg

• Zn

• F

• ZnF₂

In this reaction K (s) + Na⁺ (aq) → Na (s) + K⁺ (aq),

• K is oxidised

• K is reduced

• Na⁺ is oxidised

• Na is reduced

In this reaction C + O₂ → CO₂,

• C gained electrons

• C lost electrons

• O in CO₂ gained electrons

• O in O₂ lost electrons

In K₂CO₃ + 2HNO₃ → 2KNO₃ + CO₂ + H₂O,

• potassium' s oxidation state increased.

• there is no electron transfer.

• carbon's oxidation state dropped.

• O in O₂ lost electrons.

In N₂ + 3H₂ → 2NH₃,

• N₂ is reduced.

• H₂ is reduced.

• N in N₂ lost electrons.

• there is no oxidation/ reduction.

In 2CO + 2NO → N₂ + 2CO₂, the oxidation state of carbon changed from

• +2 in CO to +4 in CO_2.

• +4 in 2CO to +8 in 2CO_2.

• -2 in CO to -4 in CO_2.

• +1 in CO to +2 in CO_2.