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Chemistry JAMB Past Questions

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956

A given amount of gas occupies 10.0 dm3 at 4atm and 273°C. The number of moles of the gas present is?
(Molar volume of a gas at s.t.p. = 22.4 dm3)

  • A. 0.89 mol
  • B. 1.90 mol
  • C. 3.80 mol
  • D. 5.70 mol
View Answer & Discuss (26) JAMB 1998
957
8.0 g of an element X react with an excess of copper (ll) tetraoxosulphate (lV) solution to deposit 21.3 g of copper. The correct equation for the reaction is?

(Cu = 64).
  • A. X(s) + CuSO4(aq) → Cu(s) + XSO4(aq)
  • B. X(s) + 2CuSO4(aq) → 2Cu(s) + X(SO4)2(aq)
  • C. 2X(s) + CuSO4(aq) → Cu(s) + X2SO4(aq)
  • D. 2X(s) + 3CuSO4(aq) → 3Cu(s) + X2(SO4)3(aq)
View Answer & Discuss (16) JAMB 1998
958
C3H8(g) + 502(g) → 4H2O + 3CO2(g). Form the equation above the volume of oxygen at s.t.p. required to burn 50cm3 of propane is?
  • A. 250 cm3
  • B. 150 cm3
  • C. 100 cm 3
  • D. 50 cm3
View Answer & Discuss (2) JAMB 1998
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959
30cm3 of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?
  • A. 40.0 cm3
  • B. 35.7 cm3
  • C. 28.4 cm3
  • D. 25.2 cm3
View Answer & Discuss (1) JAMB 1998
960
If sulphur (IV) oxide and methane are released simultaneously at the opposite ends of a narrow tube, the rates of diffusion Rso2 and Rch4 will be in the ratio?

(S = 32, O = 16, C = 12, H = 1)
  • A. 4:1
  • B. 2:1
  • C. 1:2
  • D. 1:4
View Answer & Discuss (18) JAMB 1998
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