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Wednesday, 20 May 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 556:
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
  • A Steam distillation
  • B Destructive distillation
  • C Liquefaction
  • D Hydrolysis
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Question 557:
The formula of a compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is~?
  • A MX
  • B M<sub style='font-size: smaller;'>3</sub>X<sub style='font-size: smaller;'>4</sub>
  • C M<sub style='font-size: smaller;'>4</sub>X<sub style='font-size: smaller;'>3</sub>
  • D M<sub style='font-size: smaller;'>3</sub>X<sub style='font-size: smaller;'>2</sub>
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Question 558:
2.25g of a sample of an oxide of copper on reduction gave 2.0g of copper. 2.50g of another oxide of copper on reduction also gave 2.0g of copper. These results are in accordance with the law of?
  • A Constant composition
  • B Conservation of matter
  • C Multiple proportions
  • D Definite proportions
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Question 559:
One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the products at s.t.p?<br/>(G.M.V = 22.4 dm<sup style='font-size: smaller;'>3</sup> mol<sup style='font-size: smaller;'>-1</sup>)
  • A 112.0 dm<sup style='font-size: smaller;'>3</sup>
  • B 67.2 dm<sup style='font-size: smaller;'>3</sup>
  • C 56.0 dm<sup style='font-size: smaller;'>3</sup>
  • D 44.8 dm<sup style='font-size: smaller;'>3</sup>
View Answer & Explanation
Question 560:
An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
  • A Average velocity of the molecules
  • B Number of collisions between the molecules
  • C Density of the molecules
  • D Free mean path between each molecules and other
View Answer & Explanation