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chemistry igcse acapprinted 65 · PDF 65
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3. In the reversible reaction between nitrogen and hydrogen to form ammonia,
which condition would shift the position of equilibrium to the right?
N₂ (g) + 3H₂ (g) ⇌ 2NH₃ (g)
A) Increasing the pressure
B) Decreasing the concentration of nitrogen
C) Increasing the temperature
D) Adding a catalyst
Answer: A) Increasing the pressure
4. In a reaction where magnesium reacts with hydrochloric acid, which of the
following changes would cause the rate of reaction to decrease?
A) Increasing the surface area of magnesium
B) Using dilute hydrochloric acid instead of concentrated acid
C) Heating the reaction mixture
D) Increasing the pressure of the system
Answer: B) Using dilute hydrochloric acid instead of concentrated acid
5. Which of the following describes how a catalyst affects a reaction?
A) It increases the energy of reactant particles
B) It increases the activation energy
C) It provides an alternative reaction pathway with a lower activation energy
D) It is used up in the reaction
Answer: C) It provides an alternative reaction pathway with a lower activation
energy
6. The decomposition of ammonium chloride is a reversible reaction:
NH₄Cl (s) ⇌ NH₃ (g) + HCl (g)
Which of the following changes would result in more ammonia being produced?
A) Decreasing the temperature
B) Increasing the pressure