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Chemistry 1991 JAMB Past Questions

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21
What volume of CO2 at s.t.p would be obtained by reacting trioxocarbonate (IV) with excess acid?

(G.M.V at s.t.p = 22.4 dm3)
  • A. 2.240 cm 3
  • B. 22.40 cm 3
  • C. 224.0 cm 3
  • D. 2240 cm 3
View Answer & Discuss (15) JAMB 1991
22
If a current of 1.5 A is passed for 4.00 hours through a molten tin salt and 13.3g of tin is deposited, what is the oxidation state of the metal in the salt?

(Sn = 118.7, F = 96500 C mol-1)
  • A. 1
  • B. 2
  • C. 3
  • D. 4
View Answer & Discuss (4) JAMB 1991
23
Which of the following equimolar solutions, Na2CO3 Na2 SO
4CI FeCI3 CH3COONa,
have pH greater than 7?
  • A. FeCI 3 and NH 4CI
  • B. Na2CO3, CH3COONa and Na,Na2SO4
  • C. Na2CO3 and CH3COONa
  • D. FeCI3, CH3COONa and NH4CI
View Answer & Discuss (5) JAMB 1991
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24
MnO-4 + 8H+ + ne → Mn++ + 4H2O. Which is the value of n in the reaction above?
  • A. 2
  • B. 3
  • C. 4
  • D. 5
View Answer & Discuss (7) JAMB 1991
25

2H2S(g) + SO2(g) → 3S(s) + 2H2O(I). The above reaction is?

  • A. a redox reaction H2S is the oxidant and SO2 is the reductant
  • B. a redox reaction in which SO2 is the oxidant and H2S is the reductant
  • C. not a redox reaction because there is no oxidant in reaction equation
  • D. not a redox because there is no reductant in the reaction equation
View Answer & Discuss (7) JAMB 1991
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts