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chemistry igcse acapprinted 64 · PDF 64
145 pagesrevision 46934
printed 64 · PDF 64
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- In this reaction (Stage 2):
- The temperature is 450°C
- The pressure is 2 atm / 200 kPa
- The catalyst used is vanadium(V) oxide (V₂O₅)
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- Sulfur dioxide is formed in stage 1, then sulfur trioxide is formed in stage 2. In stage 3, sulfur
trioxide is first acidified with sulfuric acid to form a liquid known as oleum (H₂S₂O₇), and finally,
in stage 4, oleum is diluted with water to form more sulfuric acid.
Past Paper Questions
P2 :
1. Which of the following factors increases the rate of a reaction?
A) Increasing the particle size of a solid reactant
B) Lowering the concentration of reactants
C) Adding a catalyst
D) Decreasing the temperature
Answer: C) Adding a catalyst
2. Which of the following will increase the rate of reaction between magnesium and
dilute hydrochloric acid?
A) Decreasing the temperature
B) Using larger pieces of magnesium
C) Using concentrated hydrochloric acid
D) Removing the catalyst
Answer: C) Using concentrated hydrochloric acid