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JAMB UTME Chemistry 2001 past questions and answers

This 2001 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 2001 set with instant marking.

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Sample JAMB UTME Chemistry 2001 questions

1. An element has two isotopes, X-35 and X-37, present in the ratio 3:1. What is its relative atomic mass?
  1. 35.5
  2. 36.0
  3. 36.5
  4. 37.0

Answer: A. 35.5

The weighted mean is (3 x 35 + 1 x 37)/4 = 35.5.

2. What is the electronic configuration of a neutral chlorine atom with atomic number 17?
  1. 2, 7, 8
  2. 2, 8, 7
  3. 2, 8, 8
  4. 2, 9, 6

Answer: B. 2, 8, 7

The 17 electrons fill the shells as 2, 8, and 7.

3. An element has the shell configuration 2, 8, 2; in which group of the periodic table does it belong?
  1. Group I
  2. Group IV
  3. Group II
  4. Group VII

Answer: C. Group II

Two electrons in the outer shell place the element in Group II.

4. Which description best explains the bonding in magnesium oxide?
  1. Sharing of one pair of electrons between Mg and O
  2. Attraction between temporary dipoles
  3. A metallic sea of delocalized electrons
  4. Electrostatic attraction between Mg2+ and O2- ions

Answer: D. Electrostatic attraction between Mg2+ and O2- ions

Magnesium transfers two electrons to oxygen, forming oppositely charged ions held by electrostatic attraction.

5. Which apparatus is most suitable for separating ethanol from water when both liquids are present in a mixture?
  1. A fractionating column
  2. A separating funnel
  3. A filter funnel
  4. A magnet

Answer: A. A fractionating column

Ethanol and water are miscible liquids with different boiling points, so fractional distillation is suitable.

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