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Chemistry 2019 JAMB Past Questions

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76

How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?

  • A. none
  • B. 6
  • C. 7
  • D. 8
View Answer & Discuss (19) JAMB 2019
77

An element Z contains 80% of \(^{16} _8\)Z and 20% of \(^{18} _8\)Z. Its relative atomic mass is

  • A. 16.2
  • B. 17.6
  • C. 16.0
  • D. 16.4
View Answer & Discuss (1) JAMB 2019
78

When the end alkyl groups of ethyl ethanoate are interchanged, the compound formed is

  • A. propylmethanoate
  • B. ethylpropanoate
  • C. methyl ethanoate
  • D. methyl propanoate
View Answer & Discuss (3) JAMB 2019
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79

The part of the total energy of a system that accounts for the useful work done in a system is known as

  • A. Enthalpy change
  • B. None of the above
  • C. Gibb's free energy
  • D. Entropy
View Answer & Discuss (1) JAMB 2019
80

Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?
2HCl + CaCO\(_3\) → CaCl\(_2\) + H\(_2\)O + CO\(_2\)

  • A. Increasing the concentration of the acid
  • B. Increasing the surface area of CaCO\(_3\)
  • C. A and B
  • D. Reducing the concentration of the acid
View Answer & Discuss JAMB 2019
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