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Chemistry JAMB Past Questions

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1756
Hydrogen diffuses through a porous plug
  • A. at the same rate as oxygen
  • B. at a slower rate than oxygen
  • C. twice as fast as oxygen
  • D. three times as fast as oxygen
  • E. four times as fast as oxygen
View Answer & Discuss (7) JAMB 1985
1757
Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron(iii)oxide will be contained in 1kg of the compound?
  • A. 25.0 moles
  • B. 12.5 moless
  • C. 6.25 moles
  • D. 3.125 moles
  • E. 0.625 moles
View Answer & Discuss (4) JAMB 1985
1758

3.0g of a mixture of potassium carbonate and potassium chloride were dissolved were dissolved in a 250cm\(^3\) standard flask. 25cm\(^3\)  of this solution required 40.00cm\(^3\) of 0.1M HCl for neutralization. What is the percentage by weight of K\(_2\)CO\(_3\) in the mixture ? (K = 39, O = 16, C = 12)

  • A. 60
  • B. 72
  • C. 82
  • D. 89
  • E. 92
View Answer & Discuss (27) JAMB 1985
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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1759
Some properties of chemical substances are mentioned below... i. sour taste ii. slippery touch iii. yields alkaline gas with ammonium salt iv. has pH less than 7 v. turns phenolphthalein pink.

Which of the above are NOT typical properties of alkalis?
  • A. i, iv and v
  • B. iv and v
  • C. i and iv
  • D. ii and v
  • E. ii, iii and iv
View Answer & Discuss (10) JAMB 1985
1760
A certain volume of gas at 298k is heated such that its volume and pressure are now four times the original values. What is the new temperature?
  • A. 18.6k
  • B. 100.0k
  • C. 298.0k
  • D. 1192.0k
  • E. 4768.0k
View Answer & Discuss (5) JAMB 1985
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