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Chemistry 1997 JAMB Past Questions

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16
The hydroxyl ion concentrated, (OH-), in a solution of sodium hydroxide of pH 10.0 is?
  • A. 10-10 mol dm-3
  • B. 10-6 mol dm-3
  • C. 10-4 mol dm-3
  • D. 10-2 mol dm-3
View Answer & Discuss (14) JAMB 1997
17

Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?

  • A. 13.0
  • B. 7.0
  • C. 6.5
  • D. 3.0
View Answer & Discuss (8) JAMB 1997
18
Given that 15.00 cm3 of H2
SO4 was required to completely neutralize 25.00 cm3 of 0.125 mol dm-3 NaOH, calculate the molar concentration of the acid solution:
  • A. 0.925 mol dm-3
  • B. 0.156mol dm-3
  • C. 0.104 mol dm-3
  • D. 0.023 mol dm-3
View Answer & Discuss (5) JAMB 1997
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19
When platinum electrodes are used during the electrolysis of copper (ll) tetraoxosulphate (lV) solution, the solution gets progressively?
  • A. acidic
  • B. basic
  • C. neutral
  • D. amphoteric
View Answer & Discuss (5) JAMB 1997
20
How many Faraday of electricity are required to deposit 0.20 mole of nickel, if 0.10 Faraday of electricity deposited 2.98g of nickel during electrolysis of its aqueous solution?

(Ni = 58.7, 1F = 96 500 C mol-)
  • A. 0.20
  • B. 0.30
  • C. 0.40
  • D. 0.50
View Answer & Discuss (10) JAMB 1997
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