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Chemistry Past Questions and Answers

Chemistry Questions

Question 441:
JAMB 1986
Which of the following salts when dissolved in water will NOT give the corresponding pH value?
SchoolNGR Classroom
  • A NaHSO<sub style='font-size: smaller;'>4</sub>, pH < 5
  • B Na<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>3</sub>, pH > 8
  • C Na<sub style='font-size: smaller;'>2</sub>Cl,pH = 7
  • D NaHCO, pH < 6
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Question 442:
JAMB 1986
Which of the following is an acidic salt?
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  • A NaHSO<sub style='font-size: smaller;'>4</sub>
  • B Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
  • C CH<sub style='font-size: smaller;'>3</sub>CO<sub style='font-size: smaller;'>2</sub>Na
  • D Na<sub style='font-size: smaller;'>2</sub>S
View Answer & Explanation
Question 443:
JAMB 1986
Which of the following solutions will conduct the least amount of electricity?
SchoolNGR Classroom
  • A 2.00 M aqueous solution of NaOH
  • B 0.01 M aqueous solution of NaOH
  • C 0.01 M aqueous solution of hexanoic acid
  • D 0.01 M aqueous solution of sugar
View Answer & Explanation
Question 444:
JAMB 1986
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
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  • A 3.90 x 10<sup style='font-size: smaller;'>2</sup> coulombs
  • B 5.50 x 10<sup style='font-size: smaller;'>3</sup> coulombs
  • C 6.54 x 10<sup style='font-size: smaller;'>3</sup> coulombs
  • D 2.34 x 10<sup style='font-size: smaller;'>4</sup> coulombs
View Answer & Explanation
Question 445:
JAMB 1986
Which of these represents a redox reaction?
SchoolNGR Classroom
  • A AgNO<sub style='font-size: smaller;'>3</sub> + NaCl → AgCAl + NaNO<sub style='font-size: smaller;'>3</sub>
  • B H<sub style='font-size: smaller;'>2</sub>S + Pb(NO<sub style='font-size: smaller;'>3</sub>) → PbS + 2HNO<sub style='font-size: smaller;'>3</sub>
  • C CaCO<sub style='font-size: smaller;'>3</sub> → CaO + CO<sub style='font-size: smaller;'>2</sub>
  • D Zn + 2HCl → ZnCl<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>
View Answer & Explanation

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