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Chemistry Past Questions and Answers

Chemistry Questions

Question 451:
JAMB 1986
Which of the following solutions will conduct the least amount of electricity?
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  • 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 452:
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 453:
JAMB 1986
Which of these represents a redox reaction?
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  • 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
Question 454:
JAMB 1986
20 cm<sup style='font-size: smaller;'>3</sup> of 1.0 molar NH<sub style='font-size: smaller;'>4</sub>OH solution when neutralized with 20.05cm<sup style='font-size: smaller;'>3</sup> of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH<sub style='font-size: smaller;'>4</sub>OH?
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  • A -51.O KJ mol<sup style='font-size: smaller;'>-</sup>
  • B +57.3 KJ mol<sup style='font-size: smaller;'>-</sup>
  • C +57.O KJ mol<sup style='font-size: smaller;'>-</sup>
  • D +51.0 KJ mol<sup style='font-size: smaller;'>-</sup>
View Answer & Explanation
Question 455:
JAMB 1986
What is the consequences of increasing pressure on the equilibrium reaction ZnO<sub style='font-size: smaller;'>(s)</sub> + H<sub style='font-size: smaller;'>2(g)</sub> Zn<sub style='font-size: smaller;'>(s)</sub> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(I)</sub>?
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  • A The equilibrium is driven to the left
  • B The equilibrium is driven to the right
  • C There is no effect
  • D More ZnO is produced
View Answer & Explanation

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