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Chemistry JAMB Past Questions

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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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1056
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
  • A. 1.0 x 1021
  • B. 6.6 x 1021
  • C. 2.0 x 1022
  • D. 1.0 x 1022
  • E. 5.4 x 1023
View Answer & Discuss (9) JAMB 1981
1057
4g each of aluminium foil and aluminium powder were introduced respectively into flasks P and Q.
Flask P was treated with warm bench sodium hydroxide and all the aluminium dissolved in one hour. Flask Q was treated with cold sodium hydroxide and all the aluminium dissolved in 10 minutes. What was responsible for Q reacting faster than P?
  • A. There were more aluminium atoms in Q than P
  • B. The heat given off in retarded the reaction
  • C. Q generated more pressure than P during the reaction
  • D. P generated more pressure than Q
  • E. Q has a greater surface area for the reaction than P
View Answer & Discuss (8) JAMB 1981
1058

What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?

  • A. All the nitrate will decompose to their respective metals
  • B. The nitrates of calcium and potassium will decomposes to their nitrites
  • C. Only copper nitrate decomposes to the metal
  • D. Only the nitrates of zinc and copper will decompose to their oxides
  • E. The nitrates of calcium, zinc and copper decompose to their oxides
View Answer & Discuss (8) JAMB 1981
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
1059
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
  • A. calcium sulphate
  • B. calcium carbonate
  • C. calcium hydrogen carbonate
  • D. calcium hydroxide
  • E. magnesium sulphate
View Answer & Discuss (12) JAMB 1981
1060

An efflorescent compound is a substance that?

  • A. absorbs water froom the air without dissolving in it
  • B. is capable of giving off coloured luminosity
  • C. gives out water to the atmosphere
  • D. absorbs water from the air and dissolves in it
  • E. gives out its water of crystallization on heating
View Answer & Discuss (17) JAMB 1981
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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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