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Chemistry Past Questions and Answers

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Chemistry Questions

Question 456:

The approximate volume of air containing 10cm<sup style='font-size: smaller;'>3</sup> of oxygen is?

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A 20 cm<sup style='font-size: smaller;'>3</sup>
B 25 cm<sup style='font-size: smaller;'>3</sup>
C 50 cm<sup style='font-size: smaller;'>3</sup>
D 100 cm<sup style='font-size: smaller;'>3</sup>

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Question 457:

The reaction Mg + H<sub style='font-size: smaller;'>2</sub>O â†’ MgO + H<sub style='font-size: smaller;'>2</sub> takes place only in the presence of?

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A Excess Mg ribbon
B Excess cold water
C Very hot water
D Steam

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Question 458:

When steam is passed through red hot carbon, which of the following are produced?

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A Hydrogen oxygen and carbon (IV) oxide
B Hydrogen and carbon (IV) oxide
C Hydrogen and carbon (II) oxide
D Hydrogen and trioxocarbonate (IV) acid

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Question 459:

The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?

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A CO and SO<sub style='font-size: smaller;'>3</sub>
B CO and SO<sub style='font-size: smaller;'>2</sub>
C CO,SO<sub style='font-size: smaller;'>2</sub> and SO<sub style='font-size: smaller;'>3</sub>
D CO and H<sub style='font-size: smaller;'>2</sub>S

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Question 460:

Oxygen-demanding waste are considered to be a water pollutant because they?

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A Deplete oxygen which is necessary for the survival of aquatic organism
B Increase oxygen which is necessary for survival of aquatic organism
C Increase other gaseous substances which are necessary for the survival of aquatic organisms
D Deplete other gaseous species which is necessary for the survival of aquatic organisms

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