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Chemistry JAMB Past Questions

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1231

The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?

  • A. ionic
  • B. covalent
  • C. Metallic
  • D. co-ordinate
View Answer & Discuss (25) JAMB 1987
1232
If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?
  • A. r = k/√d
  • B. r = kd
  • C. r =k/d
  • D. r = k √d
View Answer & Discuss (8) JAMB 1987
1233
An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?
  • A. Neutrons 53, Protons 17
  • B. Neutrons 17, Protons 36
  • C. Neutrons 19, Protons 17
  • D. Neutrons 36, Protons 17
View Answer & Discuss (3) JAMB 1987
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1234
An element Z, contained 90% of 168Z and 10% of Z1818 its relative atomic mass is?
  • A. 16.0
  • B. 16.2
  • C. 17.0
  • D. 17.8
View Answer & Discuss (5) JAMB 1987
1235

The presence of an impurity in substance will cause the melting point to

  • A. be zero
  • B. reduce
  • C. increase
  • D. be stable
View Answer & Discuss (8) JAMB 2013
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