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Chemistry Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
3886

Which of the following oxides has a giant covalent structure?

  • A. Al\(_2\)O\(_3\)
  • B. Na\(_2\)O
  • C. P\(_4\)O\(_10\)
  • D. SiO\(_2\)
View Answer & Discuss WAEC 2020
3887

Which of the following hydroxides is not readily soluble in water?

  • A. NH\(_4\)OH
  • B. Ca(OH)\(_2\)
  • C. NaOH
  • D. KOH
View Answer & Discuss (1) WAEC 2020
3888

Which of the following statements about the solubility of a salt is correct?

  • A. A salt whose solubility increases with temperature would not crystallize easily on cooling
  • B. A salt whose solubility is independent of temperature would normally crystallize out on cooling
  • C. Crystallization would be efficient in separating out a salt whose solubility increases considerably with temperature
  • D. Solubility of a solid does not affect its crystallization
View Answer & Discuss (2) WAEC 2020
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3889

How many moles of H\(_2\)SO4 are there in 50 cm\(^3\) of 0.108 mol dm\(^3\) solution of the acid?

  • A. 5.4x 10
  • B. 5.4 x 10\(^{-3}\)
  • C. 5.4 x 10\(^{-2}\)
  • D. 5.4x 10\(^{-1}\)
View Answer & Discuss (13) WAEC 2020
3890

If 20 cm\(^3\) of sodium hydroxide was neutralized by 20 cm\(^3\) of 0.01 mol dm\(^3\) tetraoxosulphate(VI) acid, what is the concentration of the sodium hydroxide solution?

  • A. 0.010
  • B. 0.020
  • C. 0.100
  • D. 0.150
View Answer & Discuss (4) WAEC 2020
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