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Chemistry Past Questions and Answers

Chemistry Questions

Question 266:
JAMB 1982
1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen. <br/>The formula of the oxide is?
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  • A X<sub style='font-size: smaller;'>2</sub>O
  • B XO
  • C XO<sub style='font-size: smaller;'>2</sub>
  • D X<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>3</sub>
  • E X<sub style='font-size: smaller;'>3</sub>O<sub style='font-size: smaller;'>4</sub>
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Question 267:
JAMB 1982
When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?
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  • A H<sub style='font-size: smaller;'>2</sub>S
  • B Ag<sub style='font-size: smaller;'>2</sub>S
  • C PbS
  • D HNO<sub style='font-size: smaller;'>3</sub>
  • E S
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Question 268:
JAMB 1982
The production of ammonia by the haber process may be represented by the equilibrium equation N<sub style='font-size: smaller;'>2</sub>(g) + 3H<sub style='font-size: smaller;'>2</sub>(g) ↔ 2NH<sub style='font-size: smaller;'>3</sub> ∆H = -22KJ. Therefore the production of ammonia will be favoured by?
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  • A Only high pressure
  • B Only high temperature
  • C A combination of high temperature and low pressure
  • D A combination of low temperature and high pressure
  • E Low pressure
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Question 269:
JAMB 1982
Which of the following represents ethyl ethanonate?
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  • A CH<sub style='font-size: smaller;'>3</sub>CH<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
  • B (CH<sub style='font-size: smaller;'>3</sub>CO<sub style='font-size: smaller;'>2</sub>)<sub style='font-size: smaller;'>2</sub>O
  • C CH<sub style='font-size: smaller;'>3</sub>CH<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
  • D CH<sub style='font-size: smaller;'>3</sub>CO<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
  • E CH<sub style='font-size: smaller;'>3</sub>CH<sub style='font-size: smaller;'>2</sub>COCH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
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Question 270:
JAMB 1982
Which of the following equations represents an oxidizing action of sulphur dioxide?
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  • A SO<sub style='font-size: smaller;'>2</sub> + 2HNO<sub style='font-size: smaller;'>2</sub> → H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2NO<sub style='font-size: smaller;'>2</sub> + heat
  • B 2SO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O + O<sub style='font-size: smaller;'>2</sub> → 2H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
  • C SO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O + CI<sub style='font-size: smaller;'>2</sub> → H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2HCI
  • D SO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>S → 3S + 2H<sub style='font-size: smaller;'>2</sub>O
  • E K<sub style='font-size: smaller;'>2</sub>Cr<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>7</sub> + H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 3SO<sub style='font-size: smaller;'>2</sub> → K<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + Cr<sub style='font-size: smaller;'>2</sub>(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub> + H<sub style='font-size: smaller;'>2</sub>O
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