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Chemistry Past Questions and Answers

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Chemistry Questions

Question 381:

Which of the following statements is INCORRECT?

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A Fractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point
B Butane < petrol < kerosene of polythene.
C Both but-1-ene and but-1-yne will decolorize bromine readily
D But-2-ene will react with chlorine to form 2,3-dichlorobutane
E Calcuim carbide will react with water to form any alkyne

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Question 382:

Which of the following statements is NOT correct about all four of the acids: HBr, HNO<sub style='font-size: smaller;'>3</sub>, H <sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>3</sub> and H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>? They

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A Dissolve marble to liberate CO
B Have a PH less than 7
C Turn blue litmus red
D Neutralize alkalis to form salt
E React with magnesium to liberate hydrogen

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Question 383:

If the cost of electricity required to deposit 1 g of magnesium is N5.00, how much would it cost to deposit 10g of aluminium?

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A N 10.00
B N27.00
C N44.44
D N66.67
E N33.33

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Question 384:

Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over

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A Potassium hydroxide
B Heated gold
C Heated magnesium
D Heated phosphorus
E Calcium chloride

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Question 385:

Water is said to be 'hard' if it

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A Easily forms ice
B Has to be warmed before sodium chloride dissolves in it
C Froms an insoluble scum with soap
D Contains nitrates
E Contains sodium ions

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