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Tuesday, 21 April 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 81:
JAMB 1978
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
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  • A Acetic acid and ethene
  • B Methanoic acid and ethene
  • C Methanoic acid and ethylene
  • D Ethanol and ethene
  • E Acetic acid and ethylene
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Question 82:
JAMB 1978
If 30cm<sup style='font-size: smaller;'>3</sup> of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm<sup style='font-size: smaller;'>3</sup> of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?
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  • A 9.3 sec
  • B 14 sec
  • C 21 sec
  • D 28 sec
  • E 30.3 sec
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Question 83:
JAMB 1978
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
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  • A Tin
  • B Zinc
  • C Copper
  • D Lead
  • E Aluminium
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Question 84:
JAMB 1978
Which of the following gases may not be dried with concentrated sulphuric acid?
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  • A HCl
  • B N<sub style='font-size: smaller;'>2</sub>
  • C Cl<sub style='font-size: smaller;'>2</sub>
  • D SO<sub style='font-size: smaller;'>2</sub>
  • E NH<sub style='font-size: smaller;'>3</sub>
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Question 85:
JAMB 1978
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
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  • A CaCO<sub style='font-size: smaller;'>3</sub><sub style='font-size: smaller;'>(s)</sub> CaO<sub style='font-size: smaller;'>(s)</sub> + CO<sub style='font-size: smaller;'>2</sub><sub style='font-size: smaller;'>(g)</sub>
  • B C<sub style='font-size: smaller;'>(s)</sub> + O<sub style='font-size: smaller;'>2</sub><sub style='font-size: smaller;'>(g)</sub> CO<sub style='font-size: smaller;'>2</sub><sub style='font-size: smaller;'>(g)</sub>
  • C 3FeCO<sub style='font-size: smaller;'>(s)</sub> + 2OCO<sub style='font-size: smaller;'>2</sub><sub style='font-size: smaller;'>(g)</sub> FeO<sub style='font-size: smaller;'>4</sub><sub style='font-size: smaller;'>(s)</sub>
  • D SiO<sub style='font-size: smaller;'>2</sub><sub style='font-size: smaller;'>(s)</sub> + CaO<sub style='font-size: smaller;'>(s)</sub> CaCO<sub style='font-size: smaller;'>3</sub><sub style='font-size: smaller;'>(s)</sub>
  • E CO<sub style='font-size: smaller;'>2</sub><sub style='font-size: smaller;'>(g)</sub> + C<sub style='font-size: smaller;'>(s)</sub> 2CO<sub style='font-size: smaller;'>(g)</sub>
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