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2996
0.499g 0f CuSO4.xH2O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)
  • A. 0.5
  • B. 2.0
  • C. 3.0
  • D. 4.0
  • E. 5.0
View Answer & Discuss (14) JAMB 1985
2997
In the experiment, which of the following observations would suggest that a solid sample is a mixture? The
  • A. solid can be ground to a fine powder
  • B. density of the solid is 2.25gdm-3
  • C. solid begins to melt at 573k but is not completely melted until 648k
  • D. solid absorbs moisture from the atmosphere and turns into liquid
  • E. solid melts at 300k
View Answer & Discuss (1) JAMB 1985
2998
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
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2999
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
3000

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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