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Chemistry 2020 WAEC Past Questions

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36

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
37

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
38

 "Electrons always occupy the lowest empty energy level" is a statement of

  • A. Aufbau Principle
  • B. Hund's rule
  • C. Pauli Exclusion Principle
  • D. Periodic law
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39

Which of the following metals does not react with water to produce hydrogen?

  • A. Copper
  • B. Potassium
  • C. Sodium
  • D. Zinc
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40

Which of the following arrangement of elements is in decreasing order of electronegativity?

  • A. Na, Mg, Al, Si, P
  • B. Na, A1, Mg, P, Si
  • C. P, Mg, Na, Si, Al
  • D. P, Si, Al, Mg, Na
View Answer & Discuss (6) WAEC 2020
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