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Chemistry Past Questions

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2701
An element Y has the electronic configuration 1s22s22p6623p4. To what period does it belong in the periodic table?
  • A. 3
  • B. 4
  • C. 5
  • D. 6
View Answer & Discuss (8) WAEC 2002
2702
If a metal R forms a compound with the formula R(NO3)2 , the formula of its tetraoxosulphate (IV) is
  • A. R(SO4)2
  • B. RSO4
  • C. R2SO4
  • D. R2(SO4)3
View Answer & Discuss (4) WAEC 2002
2703
Which of the following decreases when a given mass of gas is compressed to half its initial volume?
  • A. Average intermolecular distance
  • B. Frequency of collisions
  • C. Number of molecules present
  • D. Atomic radius of each particle
View Answer & Discuss (3) WAEC 2002
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2704
What volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at constant temperature and pressure? The equation for reaction is 2NH3(g) → N2(g) + 3H2(g)
  • A. 50cm3
  • B. 150cm3
  • C. 200cm3
  • D. 300cm3
View Answer & Discuss (1) WAEC 2002
2705

Calculate the mass of chlorine gas which occupies a volume of 1.12 dm\(^3\) a volume of 1.12 dm\(^3\) at s.t.p [Cl = 35.5, 1 mole og gas occupies 22.4 dm\(^3\) at s. t. p ]

  • A. 1.80g
  • B. 3.55g
  • C. 7.10g
  • D. 15.50g
View Answer & Discuss (9) WAEC 2002
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