Chemistry Past Questions and Answers

Cellulose and starches can be classified as one of the following?

A Sugars
B Sucrose
C Hydrocarbons
D Carbohydrates
E Isomers

Question 32:

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner, it is not reduced to the metal. Which one is it?

A Lead oxide
B Magnesium oxide
C Copper oxide
D Tin oxide
E Iron oxide

Question 33:

Which of the following statement is false?

A Acids react with some metals, liberating hydrogen
B Acids react with carbonates, liberating carbondioxide
C Acids conduct electricity and are decomposed by the current, liberating hydrogen at the anode
D Acids have a sour taste
E Acids change the colour of indicators

Question 34:

A mixture of ethanol, sodium dichromate, and water is allowed to drop gradually into a boiling solution containing one part concentrated H₂SO₄ and the liberate gas is collected by cooling it with ice water to give a liquid. This liquid is?

A Ethanoic acid
B Acetaldehyde
C Ethyl acetate
D Methanol
E Ethylene

Question 35:

When chlorine gas is passed into a solution of sulphur dioxide?

A Sulphur dioxide is reduced to sulphur
B The chlorine is oxidized to hydrochloric acid
C Dilute sulphuric acid and hydrochloric acid are produced
D Hydrochloric acid and sulphur are produced
E Sulphur trioxide is the only product