Chemistry Test Paper 19

The substance that will dissolve in water with absorption of heat is
A. sulphuric acid.
B.ammonia.
C. hydrogen chloride.
D. potassium hydroxide.
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During the manufacture of sulphuric acid by the Contact Process, sulphur dioxide combines with oxygen to form sulphur trioxide according to the following equation:

Which one of the following conditions would favour maximum yield of sulphur trioxide?
A. Low temperature and low pressure.
B. High temperature and low pressure.
C. Low temperature and high pressure.
D. High temperature and high pressure.
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A dilute solution of potassium bromide is electrolysed using carbon electrodes. The product at the positive electrode is
A. hydrogen.
B. bromine.
C. oxygen.
D. potassiim.
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Which one of the following hydrocarbons will produce the least heat energy per mole on complete combustion?
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The gas that changes the colour of potassium dichromate from orange to green is
A. carbon dioxide.
B. hydrogen chloride.
C. sulphur dioxide.
D. hydrogen sulphide
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The element which is added to natural rubber during vulcanization is
A. silicon.
B. iodine.
C. phosphorus.
D. sulphur.
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Which one of the following equations represents a reaction that does not take place?
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Which one of the following will react with concentrated nitric acid to form a yellow solution?
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The atomic number of elements P, Q, R. and T are 19, 17, 14 and 6 respectively. The pair of elements that can react to form an ionic compound is
A. Q and T.
B. R and Q.
C. Q and P.
D. R and T.
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Which one of the following substances is an element?
A. Ice.
B. Sand.
C. Graphite.
D. Polyethene
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The reaction in which ethene forms a solid whose molecular mass is more than 10,000 is called

A. polymerization.
B. hydrogenation. .
C. vulcanization.
D. cracking.
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The substance that can react with water at room temperature is
A. magnesium.
B. zinc.
C. iron.
D. calcium.
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The salt that can be prepared by direct combination of elements is
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The statement which is not true about sulphur dioxide is
A. it turns blue litmus red.
B. it is an oxidizing agent.
C. it is a reducing agent.
D. it decolourises potassium manganate(VII).
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The compound which does not cause hardness of water is
A. calcium hydrogencarbonate.
B. calcium sulphate.
C. sodium carbonate.
D. magnesium sulphate.
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Which one of the following reagents can be used to distinguish between ethene and ethane?
A. Bromine water.
B. Lime water.
C. Potassium dichromate.
D. Barium nitrate.
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Which one of the following cations when treated with aqueous sodium hydroxide will give a precipitate that does not dissolve in excess alkali?
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The gas which when passed over strongly heated iron can oxidize the iron to iron(II) only is
A. oxygen. B. hydrogen chloride.
C. carbon monoxide. D. chlorine.
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The pigments of a green leaf can be separated by
A. distillation.
B. fractional distillation.
C. evaporation.
D. chromatography.
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Which one of the following is an alloy of lead?
A. Brass. B. Bronze,
C. Duralumin. D. Solder.
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Which one of the following substances can burn in air to form a compound with nitrogen?
A. Copper.
B. Zinc.
C. Iron.
D. Magnesium.
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The numbers of protons, neutrons and electrons in some particles are shown in the table below:

Which one of the following particles is an anion?

A. P
B. Q
C. R
D. T
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The carbonate which does not decompose when heated strongly is
A. zinc carbonate
B. potassium carbonate
C. calcium carbonate
D. Magnesium carbonate
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The gas that is normally collected by upward delivery is
A. ammonia
B. chlorine
C. sulphur dioxide.
D. hydrogen chloride
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The nitrate that decomposes when heated strongly to form a metal is
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The reaction of metals J, M and L with water under different conditions are described below:
J reacts with steam when the metal is strongly heated.
M reacts with water at room temperature
L reacts with steam when the metal is red-hot.

The order of reactivity of the metals, starting with the least reactive is
A. M, J and L B. L, J and M
C. M, L and J D. J, L and M.
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Which one of the following processes does not affect the concentration of carbon dioxide in the atmosphere?
A. Baking of bread B. Photosynthesis
C. Rusting of iron D. Respiration
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The solid that shows an increase in mass when heated strongly is
A. sulphur B. sodium carbonate
C. calcium carbonate D. magnesium
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The type pf reaction that takes place during the preparation of ethane from ethanol is
A. oxidation
B. hydrogenation
C. reduction
D. dehydration.
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The substance that sublimes when heated is
A. phosphorus
B. carbon
C. iodine
D. sulphur
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Which one of the following potassium salts will dissolve in water to give a solution that turns red litmus paper blue?
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Which one of the following is not a product of incomplete combustion of butane?
A. Soot.
B. Water.
C. Carbon monoxide.
D. Carbon dioxide.
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Each of the questions 41 to 45 consists of an assertion (statement) on the left-hand side and a reason on the right-hand side
Select:

A. if both the assertion and the reason are true statements and the reason is a correct explanation of the assertion.
B. if both the assertion and the reason are true statements but the reason is not a correct explanation of the assertion.
C. if the assertion is true but the reason is not a correct statement.
D. if the assertion is not correct but the reason is a correct statement.

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A solution of hydrogen chloride in methylbenzene does not conduct electricity because methylbenzene does not conduct
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Copper (II) hydroxide dissolves in excess aqueous ammonia because copper (II) ion forms a
complex ion with ammonia.
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Coke is used to extract iron from its ore because coke is an oxidizing agent.
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In each of the questions 46 to 50, one or more of the answers given mat’ be correct. Read each question carefully and then indicate the correct answer according to the following:

A. If 1, 2 and 3 only are correct.
B. If 1 and 3 only are correct.
C. If 2 and 4 only are correct.
D. If 4 only is correct.

Which of the following substances can be used to test for water of crystallization
1. Copper(II) sulphate.
2. Potassium dichromate.
3. Cobalt(II) chloride.
4. Potassium permanganate.
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Which of the following is/are true about diamond and graphite?
1. They have the same mass number.
2. They are isotopes.
3. They are allotropes.
4. They show similar physical properties.
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When concentrated sulphuric acid is added to sugar,
1. sugar turns black.
2. heat is evolved.
3. froathing is observed.
4. sulphur dioxide is evolved.
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Which of the following properties is/are shown by hydrochloric acid? The acid reacts with
I. copper to form hydrogen.
2. zinc to form hydrogen.
3. sodium hydroxide to give an acid salt.
4. calcium carbonate to form carbon dioxide.
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Which of the following properties make carbon dioxide useful in fire extinguishers?
1. It is denser than air.
2. it is lighter than air.
3. It is non-flammable.
4. It is an inert gas.
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Chemistry Test Paper 19

Multiple Choice Questions