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Chemistry 2015 JAMB Past Questions

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56
Chlorine gas turns damp starch-iodide paper
  • A. pink
  • B. colourless
  • C. red
  • D. dark blue
View Answer & Discuss (2) JAMB 2015
57
Chlorine consisting of two isotope of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotope of mass number 37
  • A. 20
  • B. 25
  • C. 60
  • D. 75
View Answer & Discuss (6) JAMB 2015
58
The principal constituent of natural gas is
  • A. methane
  • B. ethane
  • C. propane
  • D. Butane
View Answer & Discuss JAMB 2015
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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59

In the electrolysis of CuSo4(g) using platinum electrode the reaction at the anode is

  • A. 4H+ 4e - 2H2
  • B. 4OH= 4e- + 2H2O + O2
  • C. 2OH - 2e- = 2OH
  • D. 2OH- + 2OH = 2H2O + O2
View Answer & Discuss JAMB 2015
60

S block elements of the periodic table one made up of

  • A. groups 1, 2, 3
  • B. groups 1, and 2
  • C. group 3
  • D. group 3 to 7
View Answer & Discuss (2) JAMB 2015
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