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JAMB UTME Chemistry 2006 past questions and answers

This 2006 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 2006 set with instant marking.

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Sample JAMB UTME Chemistry 2006 questions

1. Which method is most suitable for separating two miscible liquids whose boiling points differ by 25 °C?
  1. Fractional distillation
  2. Filtration
  3. Separating funnel
  4. Sublimation

Answer: A. Fractional distillation

Fractional distillation separates miscible liquids with relatively close boiling points by repeated vaporization and condensation.

2. At standard temperature and pressure, how many moles of an ideal gas occupy 5.6 dm3? (Molar gas volume = 22.4 dm3 mol-1.)
  1. 0.125 mol
  2. 0.250 mol
  3. 0.500 mol
  4. 2.00 mol

Answer: B. 0.250 mol

The amount is 5.6/22.4 = 0.250 mol.

3. A sample of chlorine contains 75% chlorine-35 and 25% chlorine-37 atoms; what is its relative atomic mass?
  1. 35.0
  2. 34.5
  3. 35.5
  4. 36.0

Answer: C. 35.5

The weighted mean is (0.75 x 35) + (0.25 x 37) = 35.5.

4. What is the concentration of sodium hydroxide that exactly neutralizes 25.0 cm3 of 0.20 mol dm-3 hydrochloric acid when 20.0 cm3 of the alkali is used?
  1. 0.16 mol dm-3
  2. 0.20 mol dm-3
  3. 0.24 mol dm-3
  4. 0.25 mol dm-3

Answer: D. 0.25 mol dm-3

HCl and NaOH react 1:1, so the alkali concentration is (0.20 x 25.0)/20.0 = 0.25 mol dm-3.

5. A gas occupies 300 cm3 at 27 °C; what volume will it occupy at 127 °C if its pressure remains constant?
  1. 400 cm3
  2. 350 cm3
  3. 450 cm3
  4. 600 cm3

Answer: A. 400 cm3

At constant pressure, V1/T1 = V2/T2, so V2 = 300 x 400/300 = 400 cm3 using kelvin temperatures.

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