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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 826:

The colour of the solution formed when ethyne reacts with an acidic solution of potassium tetraoxomanganate (VII) is

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A Purple
B Colourless
C Green
D Pink

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Question 827:

Fats are classified as

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A Hydrocarbons
B Alkanoates
C Alkanols
D Carbohydrates

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Question 828:

Ethyne undergoes the following reactions except

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A Polymerisation
B Addition
C Substitution
D Esterification

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Question 829:

Hardness in water can be removed by adding

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A Copper (ll) tetraoxosulphate (IV)
B Sodium trioxocarbonate (IV)
C Sodium chloride
D Alum

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Question 830:

Which of the following pairs of solutions will produce a precipitate when mixed?

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A Pb(NO₃)_2(aq) and NaCI_(aq)
B MgSO_4(aq) and HCI_(aq)
C ZnCI_2(aq) and NaSO_4(aq)
D NaOH_(aq) and HNO_3(aq)

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