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Chemistry WAEC Past Questions

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226

Mg\(_2\) + 2HCI\(_{(aq)}\) → MgCI\(_{2(g)}\) + H\(_{2(g)}\).

From the equation above what mass of hydrogen would be produced if 12.0 g of magnesium reacted completely with dilute hydrochloric acid? (H = 1, Mg = 24)

  • A. 1.0g
  • B. 2.0g
  • C. 6.0g
  • D. 12.0g
  • E. 24.0g
View Answer & Discuss (8) WAEC 1994
227
The positive of an element in the Periodic Table is determined by
  • A. its density
  • B. its atomic radius
  • C. its relative atomic mass
  • D. the number of protons in its atom
  • E. the number of neutrons in its atom
View Answer & Discuss WAEC 1994
228

Which of the following electronic structures belongs to a noble gas?

  • A. 1s22s2
  • B. 1s 22s22p4
  • C. 1s22s22p63s23p6
  • D. 1s22s22p2
  • E. 1s22s22p 63s23p3
View Answer & Discuss (8) WAEC 1994
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229
In a chemical reaction, the reacting species possess energy of motion known as
  • A. potential energy
  • B. free energy
  • C. bond energy
  • D. kinetic energy
  • E. hydration energy
View Answer & Discuss (2) WAEC 1994
230
The following compounds will decompose on heating except
  • A. NaHCO3
  • B. K2CO3
  • C. MgCO3
  • D. Ca(HCO3)2
  • E. ZnCO3
View Answer & Discuss (3) WAEC 1994
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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