Chemistry Test Paper 6

The valency of M in is
1. 2
2. 3
3. 4
4. 5
Which one of the following gases in the atmosphere makes rainwater acidic?
1. Sulphur dioxide
2. Carbon monoxide
3. Ammonia
4. Nitrogen.
The main component of biogas is
1. batane
2. ethane
3. ethenc
4. methane
Which one of the following can be separated by sublimation?
1. A mixture of ammonium chloride and magnesium chloride.
2. A mixture of sodium chloride and sodium carbonate.
3. A mixture of calcium chloride and calcium carbonate
4. A mixture of lead (II) chloride and iron filings.
Which one of the following processes is Not an example of oxidation?
1. The burning of methane in air
2. The rusting of iron nails.
3. The melting of a candle wax.
4. The smouldering of phosphorus.
Which one of the following reactions can be used to prepare hydrogen in the laboratory?
1. Reacting calcium with dilute sulphuric acid.
2. Reacting sodium with water.
3. Reacting zinc with dilute hydrochloric acid
4. Reacting magnesium with steam.
Use the following to answer question 7 and 8
The melting points and boiling points of substances R, S, T and U are shown below.

Which One of the substances is a gas at room temperature (25C)
1. R
2. S
3. T
4. U
Which one of the substances is a metal?
1. R
2. S
3. T
4. U
2.0 g sodium hydroxide was dissolved in water to make 500cm of solution. The molarity of the solution is (H = I, O = 16, Na - 23)
1. 2M
2. 0.5M
3. 0.1M
4. 0.05M
Which one of (he following reactions shows the oxidizing property of nitric acid?
1. A
2. B
3. C
4. D
Which one of the following methods below is used to prepare a sample of copper (II) chloride?
1. Heating copper in a stream of dry chlorine.
2. Action of copper on dilute hydrochloric acid.
3. Reacting copper (II) oxide with hydrochloric'acid.
4. Heating copper in a stream of dry hydrogen chloride.
Sulphur dioxide behaves as an oxidizing agent when it reacts with
1. concentrated nitric acid.
2. iron (III) sulphate
3. hydrogen sulphide
4. potassium dichromate.
What is the percentage of sulphur in iron (III) sulphate. ? (0=16; S=32; Fe=56)
1. A
2. B
3. C
4. D
Which one of the following crystalline substances will turn into white powder when exposed to air?
1. copper (II) sulphate
2. Magnesium sulphate .
3. Sodium carbonate
4. Calcium chloride.
Barium sulphate is insoluble in water. How can it be prepared in the laboratory?
1. By dissolving barium oxide in concentrated sulphuric acid.
2. By adding barium nitrate solution to dilute sulphuric acid.
3. By dissolving barium metal in dilute sulphuric acid
4. By adding barium carbonate to concentrated sulphuric acid.
Use the following information to answer questions 16 and 17
The electronic configuration of element W, X, Y and Z are shown below:
W: 2:8:3 X: 2: 8: 5 Y: 2:8:6 Z: 2:2:8:2
Which of the following elements form positive ions?
1. X and Y
2. Y and Z
3. W and Z
4. W and X
Which one of the following pairs of elements will react to form a covalent compound?
1. X and Z
2. X and Y
3. W and Y
4. Y and Z
When 4.0g of an oxide of an element X were reduced, 3.2g of X were obtained. The simplest formula of the oxide of X is (X = 64)
1. A
2. B
3. C
4. D
When silver nitrate was added to a solution followed by dilute nitric acid, a white precipitate was formed. The solution contained.
1. Sulphate ions
2. Carbonate ions
3. Chloride ions
4. Sulphite ions.
When aqueous ammonia was added solution X, a white precipitate was formed which dissolved in excess ammonia solution. X contained.
1. A
2. B
3. C
4. D
Lead (II) nitrate reacts with potassium iodide according to the equation:

The mass of lead (II) iodide that will be formed when 33.2 of potassium iodide reacts with excess lead (II) nitrate is
1. 16.6g
2. 46.g
3. 66.4 g
4. 92.2g
Magnesium reacts with chlorine, when heated, according to the equation:

The volume of chlorine in litres at s.t.p that will react completely with 0.6g of magnesium is
1. A
2. B
3. C
4. D
Which one of the following is the correct statement about electroplating a substance with copper?
1. The anode is made of the substance to be copper plated.
2. The cathode is made of copper.
3. The anode is made of copper.
4. The electrolyte is dilute sulphuric acid.
How is permanent hardness of water removed?
1. By boiling the water
2. By adding slaked lime
3. By adding washing soda
4. By adding ammonia solution.
Which one of the following equations represents a neutralization reaction?
1. A
2. B
3. C
4. D
The following are some properties of metals P, Q and R.
(i) P reacts only with steam to produce hydrogen.
(ii) O reacts with cold water to produce hydrogen
(iii) R displaces Q from solution of its ions.
The order of reactivity of the metals, beginning with the most reactive, is
1. P, Q, R.
2. Q, R, P
3. P, R, Q
4. R, Q, P
When 2.0g of substance X were burnt the heat produced raised the temperature of l000g of water by 15.6C. The molar heat of combustion of X in joules is (The specification heat capacity of water is relative molelcular mass of X is 60)
1. A
2. B
3. C
4. D
One advantage of hard water is that
1. it does not contain bacteria
2. it forms lather more readily with soap.
3. it contains calcium compound which help to form healthy bones.
4. it forms scales in boilers which prevent the boilers from leaking.
Which one of the following does Not produce a white precipitate with lead(II) nitrate
1. Dilute sulphuric acid
2. Dilute hydrochloric acid
3. Excess ammonia solution
4. Excess sodium hydroxide solution.
Carbon monoxide can be obtained from carbon dioxide by
1. heating carbon dioxide in the absence of air.
2. Passing carbon dioxide over heated carbon.
3. Heating a mixture of carbon dioxide and steam.
4. Passing carbon dioxide over heated copper.
ASSERTION - REASON QUESTIONS
Each of the questions 31 to 36 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.

Chlorine is used in the purification of water because chlorine is a bleaching agent.
1. A
2. B
3. C
4. D
Hydrochloric acid reacts faster with granules than zinc powder because zinc granules have a smaller zinc surface area than zinc powder.
1. A
2. B
3. C
4. D
In the contact process, sulphur trioxide trioxide is dissolved in concentrated sulphuric acid and not in water because sulphur trioxide is insoluble in water.
1. A
2. B
3. C
4. D
Crude petroleum is refined by fractional crystallization because its fractions have different boiling points.
1. A
2. B
3. C
4. D
When a solution of copper (Il)sulphate is electrolysed using copper electrode, the mass of the anode decreases because the anode itself becomes oxidized during the process of electrolysis,
1. A
2. B
3. C
4. D
Pure sulphuric acid does Not conduct electricity because it has a great affinity for water.
1. A
2. B
3. C
4. D
Sodium carbonate dissolves in water to form a solution whose pH is less than 7 because sodium carbonate is a salt formed by the Reaction of a strong Base and a weak acid.
1. A
2. B
3. C
4. D
Zinc is used lo galvanize iron because zinc is passive in air
1. A
2. B
3. C
4. D
MULTIPLE COMPLETION QUESTIONS
In each of the questions 39 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 elements burn(s) in oxygen to form a basic oxide?
1. Aluminium
2. Sulphur
3. Calcium
4. Carbon
1. A
2. B
3. C
4. D
Which of the following gases be collected by the method shown in the diagram above?
1. A
2. B
3. C
4. D
When a mixture of ethanol and concentrated sulphuric acid is healed, a gas is liberated. Which of the following properties is / are shown by the gas?
1. it is insoluble in water.
2. It decolourises bromine water
3. it decolourises potassium manganate (VII)
4. It forms a white precipitate with lime water.
1. A
2. B
3. C
4. D
An alkali metal M is below potassium in the Periodic Table. Which of the following properties is / are shown by M?
1. M reacts violently with cold water.
2. M forms coloured salts
3. M forms a bromide of formula MBr
4. M is a gas at room temperature.
1. A
2. B
3. C
4. D
Which of the following is / are true about an aqueous solution of hydrogen chloride?
1. it turns red litmus paper to blue.
2. it react.- with hydrogen carbonates to form carbon dioxide.
3. it bleaches litmus paper.
4. It reacts with zinc oxide to form zinc chloride.
1. A
2. B
3. C
4. D
When a compound P was strongly heated, a gas which turns lime water milky was liberated. P is likely to be
1. sodium hydrogen carbonate
2. sodium carbonate decahydrate.
3. potassium hydrogen carbonate;
4. potassium carbonate.
1. A
2. B
3. C
4. D
Which of the following occur(s) when sodium nitrate is strongly heated?
1. it melts
2. it gains weight
3. it liberates oxygen
4. it liberates nitrogen dioxide.
1. A
2. B
3. C
4. D
Concentrated sulphuric acid was added to crystals of sugar in a beaker. Which of the following observations was / were made?
1. Heat energy was evolved
2. The crystals crumbled into a powder
3. A black substance was formed
4. A hissing sound was heard.
1. A
2. B
3. C
4. D
Which of the statements below is / are true about atoms?
1. They combine in small whole numbers.
2. they are made up of neutrons, protons arid electrons.
3. they have nuclei which take up the largest volume of the atoms.
4. they are all exactly alike for a given element.
1. A
2. B
3. C
4. D
Which of the following is / are observed when sodium is heated and lowered into ajar of chlorine?
1. White clouds
2. Sodium melts.
3. Sodium burns with a yellow flame
4. A shower of sparks is emitted.
1. A
2. B
3. C
4. D
In which of the following reactions is a catalyst required?
1. A
2. B
3. C
4. D
The discharged of an ion at an electrode depends on
1. the position of the ion in the activity series.
2. the concentration of the ion.
3. the nature of the electrode.
4. the magnitude of the charge on the ion.
1. A
2. B
3. C
4. D

Chemistry Test Paper 6

Certificate Chemistry