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Chemistry 2012 WAEC 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
16

The number of sulphur atoms in 3.20g of SO\(_{2(g)}\) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 x 10\(^{23}\)]

  • A. 3.01 x 1022
  • B. 6.02 x 1022
  • C. 6.02 x1023
  • D. 1.20 x 1024
View Answer & Discuss (5) WAEC 2012
17

Consider the reaction represented by the following equation: xCH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + zH\(_2\)O. The values of x,y and z respectively, are

  • A. 2,3 and 4
  • B. 2, 4 and 3
  • C. 1,2 and 3
  • D. 1, 3 and 5
View Answer & Discuss WAEC 2012
18
The formula of mercury (l) dioxonitrate (III) is
  • A. HgNO3
  • B. Hg2NO2
  • C. Hg2(NO2)2
  • D. Hg(NO3)2
View Answer & Discuss (4) WAEC 2012
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19

A sample of a gas may be identified as chlorine if it turns

  • A. damp blue litmus paper red
  • B. lime water miky
  • C. lead ethanoate paper black
  • D. starch iodide paper blue-black
View Answer & Discuss (9) WAEC 2012
20

A metal M forms two types of chlorine, MCl\(_2\) and MCl\(_3\) which of the following laws best explains the relationship between the chlorides? Law of

  • A. conservation of mass
  • B. definite proportion
  • C. multiple proportion
  • D. reciprocal proportion
View Answer & Discuss WAEC 2012
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