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Chemistry 1995 JAMB Past Questions

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21
Which of the following is a redox reaction?
  • A. KCI(aq) + H2SO4(aq) → KHSO4(aq) + HCI(aq)
  • B. 2FeBr2(aq) + Br4(aq) → 2FeBr3(aq)
  • C. 3AgNO(aq) + FeCl3(aq) → 3AgCl(aq) + Fe(NO3)3(aq)
  • D. H2CO3(aq) → H2O(I)2- + CO2(g)
View Answer & Discuss (3) JAMB 1995
22
Cr2O72-(aq) + 14H+(aq) + 6l-(aq) → 2Cr3+(aq) + 3l(g) + 7H2O(I).
The change in the oxidation number of oxygen in the equation above is?
  • A. 0
  • B. 1
  • C. 2
  • D. 7
View Answer & Discuss (5) JAMB 1995
23
If an equilibrium reaction has ∆H < O, the reaction will proceed favorably in the forward reaction at?
  • A. low temperatures
  • B. high temperatures
  • C. all temperatures
  • D. all pressures
View Answer & Discuss (3) JAMB 1995
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24
Which of the following processes leads to increase in entropy?
  • A. Mixing a sample of NaCl and sand
  • B. Condensation of water vapour
  • C. Boiling a sample of water
  • D. Cooling a saturated solution
View Answer & Discuss (1) JAMB 1995
25
Which of the following equilibria is shifted to the right as a result of an increase in pressure?
  • A. H2(g) + I2(g) 2HI(g)
  • B. 2NO2(g) N2O4(g)
  • C. PCl5(s) PCl3(s) + Cl2(g)
  • D. 2O3(g) 3O2(g)
View Answer & Discuss (5) JAMB 1995
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