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JAMB UTME Chemistry 2002 past questions and answers

This 2002 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 2002 set with instant marking.

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Sample JAMB UTME Chemistry 2002 questions

1. A neutral atom has atomic number 17 and mass number 35. How many neutrons does its nucleus contain?
  1. 18
  2. 17
  3. 35
  4. 52

Answer: A. 18

The number of neutrons is the mass number minus the atomic number, so 35 - 17 = 18.

2. In the formation of sodium oxide, Na2O, what happens to the valence electrons?
  1. Each sodium atom gains one electron from oxygen
  2. Two sodium atoms each transfer one electron to an oxygen atom
  3. Oxygen transfers two electrons to sodium
  4. The atoms share one pair of electrons equally

Answer: B. Two sodium atoms each transfer one electron to an oxygen atom

Each of the two sodium atoms loses one electron, and the oxygen atom gains both to form Na2O.

3. A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. What is its empirical formula? (C=12, H=1, O=16)
  1. C2H4O2
  2. CH4O
  3. CH2O
  4. C2H2O

Answer: C. CH2O

The mole ratio is 40/12 : 6.7/1 : 53.3/16, approximately 1:2:1, giving CH2O.

4. What volume is occupied by 0.50 mol of an ideal gas at room temperature and pressure if the molar gas volume is 24 dm^3 mol^-1?
  1. 6 dm^3
  2. 10 dm^3
  3. 24 dm^3
  4. 12 dm^3

Answer: D. 12 dm^3

Volume equals amount multiplied by molar volume, so 0.50 x 24 = 12 dm^3.

5. Calculate the relative formula mass of calcium hydroxide, Ca(OH)2. (Ca=40, O=16, H=1)
  1. 74
  2. 57
  3. 58
  4. 90

Answer: A. 74

The relative formula mass is 40 + 2(16 + 1) = 74.

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