4g each of aluminium foil and aluminium powder were introduced respectively into flasks P and Q.

Flask P was treated with warm bench sodium hydroxide and all the aluminium dissolved in one hour. Flask Q was treated with cold sodium hydroxide and all the aluminium dissolved in 10 minutes. What was responsible for Q reacting faster than P?

• A There were more aluminium atoms in Q than P
• B The heat given off in retarded the reaction
• C Q generated more pressure than P during the reaction
• D P generated more pressure than Q
• E Q has a greater surface area for the reaction than P