Test Paper 5

The main components of air are
1. oxygen and nitrogen
2. oxygen and hydrogen
3. nitrogen and carbon dioxide
4. nitrogen and noble gases.
Which one of the following substances undergoes a chemical reaction
when heated?
1. Ice
2. Argon
3. Iodine
4. Sulphur.
The percentage, by mass of phosphorus in calcium phosphate
is…. (Ca = 40; P = 31; O = 16)
1. 8%
2. 10%
3. 17%
4. 20%
Questions 4 and 5 concern the following suits:

A. Copper (II) carbonate
B. Lead (II) nitrate
C. Magnesium sulphate
D. Potassium choride.
1. A
2. B
3. C
4. D
Questions 4 and 5 concern the following suits:

A. Copper (II) carbonate
B. Lead (II) nitrate
C. Magnesium sulphate
D. Potassium choride.

Select from A to D, the salt which can be prepared by .
5. precipitation
1. A
2. B
3. C
4. D
Equal volumes of 0.1M sodium hydroxide and 0.2 hydrochloric acid were reacted. Which of the following statements is correct about the reaction.
1. A white precipitate is formed
2. The pH of" the final solution is 7
3. There is a drop in temperature
4. Sodium chloride and water are formed
A solution that contains zinc ions will form
1. A reddish brown precipitate with magnesium.
2. A white precipitate soluble in excess sodium hydroxide solution.
3. A white precipitate with dilute sulphuric acid.
4. A green precipitate insoluble in excess aqueous ammonia.
Which one of the following substances is used to bleach sugar?
1. Chlorine.
2. Calcium chloride.
3. Sulphur dioxide.
4. Sodium sulphite.
Propene burns in oxygen according to the equation:

when 2.1g of propane is completely burned in oxygen, the volume of carbon dioxide produced at room temperature is (C = 12, H = 1)
1. 1.2dm3
2. 2.4dm3
3. 3.6dm3
4. 4.8 dm3
Which one of the following gases is least soluble in water?
1. Chlorine.
2. Ammonia.
3. Sulphur dioxide.
4. Hydrogen chloride.
When concentrated sulphuric acid is added to sugar, a black substance is produced. This is because sulphuric acid is
1. a strong reducing agent
2. a strong oxidizing agent
3. a strong dehydrating agent
4. a strong and corrosive acid.
Element M forms the ion M 3+. The atomic number of M is
1. 12
2. 13
3. 15
4. 19
Metal P displaces hydrogen from dilute acids but metal Q does not. Metal R displaces P from its chloride. The order of reactivity of the metals, beginning with the most reactive, is
1. P, Q, R
2. Q, P, R
3. R, Q. P
4. R, P, Q
Which one of the following acids can react with a base to produce an acid salt?
1. Nitric acid
2. Ethanoic acid
3. Sulphurous acid
4. Hydrochloric acid.
Sulphur reacts with concentrated nitric acid to form
1. sulphuric acid
2. sulphur dioxide
3. sulphur dioxide
4. hydrogen sulphide.
The formation of methanol from hydrogen and carbon monoxide is represented by the equation:
What would be the energy released, in kJ mol-1, when 3.2g of methanol is formed? ( C = 12, H = 1, O = 16)
1. 2.9
2. 3.6
3. 9.2
4. 10. 2
A dilute solution of potassium bromide was electrolysed using carbon electrodes. The product at the positive electrode was
1. oxygen
2. bromine
3. hydrogen
4. potassium
When testing for a sulphate, dilute nitric acid is added before barium nitrate in order to
1. catalyze the reaction
2. acidify the medium for reaction
3. change the sulphate to a sulphite.
4. Eliminate any sulphite or carbonate present.
When 6.4 g of an oxide of element X was heated and hydrogen passed over it, 3.2 g of X was formed. The empirical formula of the oxide is (X =32, O =16)
1. A
2. B
3. C
4. D
Which one of the following chlorides is deliquescent?
1. zinc chloride
2. calcium chloride
3. potassium chloride
4. magnesium chloride.
Which mass, in grams of sodium carbonate – 10-water, is contained in 50cm3 of a 0.1M solution? (Na = 23, C = 12, O = 16, H = 1).
1. A
2. B
3. C
4. D
A gas has the following properties:
(i) turns blue litmus red
(ii) forms white fumes with ammonia.
(iii) forms a white precipitate with aqueous silver nitrate.
The gas is
1. hydrogen chloride
2. hydrogen sulphide
3. sulphur dioxide
4. carbon dioxide.
Ethene can react to form a solid whose molecular mass is more than 10,000. The reaction is called
1. Cracking.
2. hydrogenation
3. vulcanisation.
4. polymerization.
When carbon dioxide is bubbled through lime water, the lime water turns milky and finally clears because
1. the milky substance reacts to form a soluble compound.
2. Lime water is a good solvent for the milky substance.
3. The reaction between carbon dioxide and time water is reversible.
4. Carbon dioxide eventually dissolves in lime water to form carbonic acid.
Fertiliser W was treated with calcium hydroxide and a gas which turned red litmus paper blue was evolved. W contained.
1. sodium nitrate
2. ammonium nitrate
3. potassium sulphate
4. potassium phosphate.
The electronic configurations of elements W, X, Y and Z are:
W: 2, 8, 2: X: 2, 8, 6; Y: 2, 8, 7; Z : 2, 8: 3.
Which one of the following pairs are non metals?
1. Y and Z
2. X and Y
3. W and Z
4. W and X.
An element burns readily in oxygen to form a solid. The solid dissolves in water producing an alkaline solution and a gas, which relights a glowing spin. The element is
1. sulphur
2. sodium
3. magnesium
4. phosphorus.
To test for u chloride in solution.
1. nitric acid is added followed by silver nitrate solution.
2. Sodium hydroxide is added dropwise until in excess.
3. Aqueous ammonia is added dropwise until in excess.
4. Iron (II) sulphate solution is added followed by concentrated sulphuric acid.
Which one of the following compounds does not cause hardness of water?
1. Calcium sulphate
2. Sodium carbonate
3. Magnesium sulphate
4. Calcium hydrogen carbonate.
Which one of the following oxides can be reduced by dry ammonia?
1. Zinc oxide
2. calcium oxide
3. Iron(IIl)oxide
4. Copper (Il)oxide
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.

Manganese (IV) oxide reacts with concentrated hydrochloric acid to produce chlorine because manganese (IV) oxide is a basic oxide.
1. A
2. B
3. C
4. D
Carbon monoxide diffuses more rapidly limn carbon dioxide because the molecular mass of carbon monoxide is less than that of Carbon dioxide.
1. A
2. B
3. C
4. D
When sodium hydroxide solution on a watch glass is exposed to air a white crust is formed because the solution evaporates, leaving solid sodium Hydroxide.
1. A
2. B
3. C
4. D
Sulphur dioxide turns moist dichromate paper green because it is an acidic gas.
1. A
2. B
3. C
4. D
When chlorine is bubbled through iron(III) chloride solution, the colour changes from yellow to green, because chlorine is an oxidizing agent.
1. A
2. B
3. C
4. D
2M nitric acid is as strung an acid as 2 M ethanoic acid because the acids have the same molarity.
1. A
2. B
3. C
4. D
MULTIPLE COMPLETION QUESTIONS
In each of the questions 37 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 compound(s) is / are usually used as drying agent((s)? 1. 1. Magnesium oxide
2. Calcium oxide
3. Ammonium chloride
4. Calcium chloride.
1. A
2. B
3. C
4. D
When a burning piece of magnesium is plunged into a jar of carbon dioxide, the following observation(s) is / are made:
1. The magnesium continues to burn brightly.
2. Black particles are formed
3. A white ash is formed
4. The burning magnesium is extinguished.
1. A
2. B
3. C
4. D
Hydrogen
1. is lighter than air
2. burns in air producing water.
3. reduces heated iron (III) oxide
4. relights a glowing split.
1. A
2. B
3. C
4. D
Which of the following metals is / are normally used for making cables?
1. Zinc
2. Copper
3. Magnesium
4. Aluminium
1. A
2. B
3. C
4. D
The electronic configuration o the atoms of elements F, Q, R, S. T and U are as follows: P: 2:8:2 S: 2:8:5 Q: 2:8:3 T: 2:8:6 R :2 :8 :4 U: 2:8:7
Which of the pair (s) of elements will form a covalent compound?
1. T and R
2. P and U
3. T and S
4. Q and U
1. A
2. B
3. C
4. D
When fuming nitric acid was heated, the gas evolved was collected over water. The gas was
1. nitrogen monoxide
2. hydrogen
3. nitrogen dioxide
4. oxygen.
1. A
2. B
3. C
4. D
The slag formed in the blast furnace during the extraction of iron is used for
1. surfacing roads .
2. making steel
3. manufacturing cement
4. electroplating.
1. A
2. B
3. C
4. D
Aqueous sodium hydroxide was added to a solution of salt X and a white precipitate insoluble in excess alkali was formed. X contained
1. lead ions
2. zinc ions
3. aluminium ions
4. magnesium ions.
1. A
2. B
3. C
4. D
Which of the following compound(s) has / have a multiple bond?
1. A
2. B
3. C
4. D
When copper (II) carbonate powder is heated strongly
1. it gives off water of crystallization.
2. a gas which turns lime water milky is produced.
3. it turns pale green and finally brown
4. it forms a black residue.
1. A
2. B
3. C
4. D
Electrovalent compounds
1. dissolve in water to form alkaline solutions.
3. are formed by sharing of electrons.
3. have low melting points.
4. are strong electrolytes.
1. A
2. B
3. C
4. D
The rate of the reaction between zinc and hydrochloric acid is increased by
1. increasing the concentration of the acid.
2. using granulated zinc instead of zinc powder.
3. adding some copper (II) sulphate to the mixture.
4. immersing the reaction vessel in ice mixture.
1. A
2. B
3. C
4. D
Hydrogen bromide in solution.
1. reacts with magnesium forming hydrogen and a salt.
2. reacts with a base to form a salt and water only.
3. liberates carbon dioxide from carbonates.
4. bleaches litmus paper.
1. A
2. B
3. C
4. D
Graphite
1. is an allotrope of carbon
2. is an isotope of carbon
3. conducts electricity in the solid state
4. consists of atoms arranged in a tetrahedral shape.
1. A
2. B
3. C
4. D

Test Paper 5

Certificate Chemistry