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Chemistry Past Questions

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3341

Which of the following statements is true about ionic radius? Ionic radius

  • A. increases as nuclear charge increases
  • B. decreases as nuclear charge increases
  • C. decreases as nuclear charge decreases
  • D. remains constant as nuclear charge increases
View Answer & Discuss (2) WAEC 2018
3342

Analysis of a hydrocarbon shows that it contains 0.93g of Carbon per gram of the compound. The mole ratio of carbon to hydrogen in the compound is [H = 1.0, C=12.0]

  • A. 1:1
  • B. 1:2
  • C. 2:1
  • D. 2:3
View Answer & Discuss WAEC 2018
3343

The law of definite proportions states that

  • A. pure samples of the same compound contain the same elements combined in the same proportion by mass
  • B. pure samples of substances are in the same proportion by mass
  • C. chemical compounds are pure because they contain the same elements
  • D. matter can neither be created nor destroyed.
View Answer & Discuss (2) WAEC 2018
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3344

What is the relative molecular mass of a compound which has empirical formula \(CH_{2}O\)?   [C= 12, H= 1, O= 16]

  • A. 42
  • B. 45
  • C. 126
  • D. 180
View Answer & Discuss (1) WAEC 2018
3345

Atoms are electrically neutral because they

  • A. do not conduct electricity
  • B. contain equal number of protons and electrons
  • C. are composed of neutrons and electrons
  • D. cannot be attracted by electromagnetic field.
View Answer & Discuss WAEC 2018
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