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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 126:

Which of the following is not correct of glucose and fructose?They

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A Are structural isomers
B Reduce fehling's solution
C Can be obtained by the hydrolysis of starch
D Are readily fermented by enzymes
E Are soluble in water

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Question 127:

To what temperature must a gas be raised from 273K in order to double both its volume and pressure?``

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A 298k
B 300k
C 546k
D 819k
E 1092k

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Question 128:

Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?

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A It is volatile
B It is strongly oxidizing
C It forms a layer of oxide on the metal
D Trioxonitrate (V) salts are soluble in water
E It renders the metals passive

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Question 129:

Which of the following is normally used for drying ammonia gas?

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A Concentrated tetraoxonitrate (Vl) acid
B Calcium oxide
C Anhydrous calcium chloride
D Phosphorus (V) oxide
E Anhydrous copper (ll) tetraoxosulphate (VI)

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Question 130:

Nuclear reactions can be used in the following except

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A Gauging the thickness of objects
B Making atomic bombs
C Curing cancer
D Generating electricity
E Purifying water

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