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Chemistry 2018 JAMB Past Questions

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66

Which of the following metals cannot replace hydrogen from water or steam?

  • A. Sodium
  • B. Magnesium
  • C. Iron
  • D. Copper
View Answer & Discuss (9) JAMB 2018
67

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

  • A. P will form an electrovalent bond with R
  • B. Q will form a covalent bond with S
  • C. R will form an electrovalent bond with S
  • D. Q will form an electrovalent bond with S
View Answer & Discuss (1) JAMB 2018
68

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment

  • A. the litmus turns blue but no gas is evolved
  • B. the litmus turns blue and oxygen is evolved
  • C. the litmus turns blue and hydrogen is evolved
  • D. the litmus turns red and oxygen is evolved
View Answer & Discuss (2) JAMB 2018
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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69

The derivative of benzene that can be used in making explosives is

  • A. aniline
  • B. xylene
  • C. phenol
  • D. toluene
View Answer & Discuss (7) JAMB 2018
70

In electrovalency, the oxidation number of the participating metal is always

  • A. decreasing
  • B. increasing
  • C. constant
  • D. neutral
View Answer & Discuss (6) JAMB 2018
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WAEC offline past questions - with all answers and explanations in one app - Download for free
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709