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Chemistry 1993 JAMB Past Questions

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16
4.0 g of sodium hydroxide in 250 cm3 of solution contains?
  • A. 0.40 moles per dm3
  • B. 0.10 moles per dm3
  • C. 0.04 moles per dm3
  • D. 0.02 moles per dm3
View Answer & Discuss (9) JAMB 1993
17
During the electrolysis of a salt of a metal M, a current of 0.5 A flows from for 32 minutes 10 seconds and deposits 0.325 g of M, What is the charge of the metal ion?

(M = 65, If = 96,500 C per mole of electron)
  • A. 1
  • B. 2
  • C. 3
  • D. 4
View Answer & Discuss (13) JAMB 1993
18
Which of the reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?
  • A. OH- - e → OH
  • B. CIsup>- - e → CI
  • C. OHsup>- + CIsup>-HCI + O2
  • D. Na+ - esup>- Hg (Na)/(Hg) amalgam
View Answer & Discuss (12) JAMB 1993
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19
The oxidation states of chlorine in HOCL, HCLO3 and HCLO4 are respectively?
  • A. -1, +5, and +7
  • B. -1, -5 and 7
  • C. +1, +3 and +4
  • D. +1, +5 and +7
View Answer & Discuss (13) JAMB 1993
20
A reaction takes places spontaneously if?
  • A. ∆G = O
  • B. ∆S < O and ∆H > O
  • C. ∆H < T ∆S
  • D. ∆G > O
View Answer & Discuss (4) JAMB 1993
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