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JAMB UTME Chemistry 2010 past questions and answers

This 2010 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 2010 set with instant marking.

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Sample JAMB UTME Chemistry 2010 questions

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

Answer: B. Copper

Copper(II) ions gain electrons at the cathode to form copper metal.

2. What is the oxidation number of chromium in the dichromate ion, Cr2O7^2-?
  1. +3
  2. +4
  3. +5
  4. +6

Answer: D. +6

Seven oxygen atoms contribute -14 and the ion has charge -2, so the two chromium atoms total +12 and each is +6.

3. In a simple zinc-copper cell, in which direction do electrons flow through the external wire?
  1. From zinc to copper
  2. From copper to zinc
  3. From the salt bridge to zinc
  4. From the electrolyte to copper

Answer: A. From zinc to copper

Zinc is oxidized at the anode and releases electrons that flow to the copper cathode.

4. Which method protects an iron ship hull by attaching a more reactive metal to it?
  1. Painting with water-soluble dye
  2. Coating it with copper
  3. Attaching blocks of magnesium
  4. Keeping it in contact with air

Answer: C. Attaching blocks of magnesium

Magnesium oxidizes more readily than iron and therefore acts as a sacrificial anode.

5. For N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of increasing pressure at constant temperature on the equilibrium yield of ammonia?
  1. It decreases the yield
  2. It increases the yield
  3. It has no effect on the yield
  4. It stops the reaction

Answer: B. It increases the yield

Higher pressure favors the side with fewer gas molecules, which is the ammonia side.

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