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JAMB UTME Chemistry 2022 past questions and answers

This 2022 JAMB UTME Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2022 set with instant marking.

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Sample JAMB UTME Chemistry 2022 questions

1. A powdered solid reacts faster than the same mass of large lumps of the solid because the powder has a
  1. lower density
  2. larger total surface area
  3. lower activation energy
  4. higher relative molecular mass

Answer: B. larger total surface area

Powder exposes more particles at the surface, increasing the frequency of effective collisions.

2. For N2(g) + 3H2(g) ⇌ 2NH3(g), increasing the pressure at constant temperature shifts the equilibrium
  1. to the left because ammonia decomposes
  2. to the left because there are fewer reactants
  3. in neither direction
  4. to the right because the product side has fewer gas molecules

Answer: D. to the right because the product side has fewer gas molecules

Higher pressure favours the side with fewer moles of gaseous particles, which is the ammonia side.

3. What is the oxidation number of manganese in KMnO4?
  1. +7
  2. +4
  3. +2
  4. -1

Answer: A. +7

Potassium contributes +1 and four oxygen atoms contribute -8, so manganese must be +7 for the compound to be neutral.

4. During the electrolysis of aqueous copper(II) sulfate using inert electrodes, what is deposited at the cathode?
  1. Oxygen
  2. Sulfur
  3. Copper
  4. Hydrogen sulfate

Answer: C. Copper

Cu2+ ions gain electrons at the cathode and form copper metal.

5. What is the general molecular formula for an acyclic alkyne containing one carbon-carbon triple bond?
  1. CnH2n
  2. CnH2n-2
  3. CnH2n+2
  4. CnHn

Answer: B. CnH2n-2

One triple bond gives an acyclic alkyne the general formula CnH2n-2.

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