Chemistry Test paper 4

Brass is an alloy of
1. tin and copper
2. lead and copper
3. zinc and copper
4. aluminium and copper.
Which one of the following is normally used as a catalyst in the manufacture of 2 sulphuric acid by the contact process?
1. Vanadium (V) oxide
2. Manganese (IV) oxide
3. Platinum
4. Iron.
A 0.2 molar solution of X contains 18.25g of X per litre of the solution. The relative molecular mass of X is
1. 18.25
2. 36.50
3. 45.63
4. 91.25
Which one of the mixtures is best separated by using a separating funnel?
1. Oil and water
2. Sugar and water
3. Ethanol and water
4. Sand and water.
One of the products of the electrolysis of brine is
1. Sodium nitrate
2. Sodium sulphate
3. sodium carbonate
4. sodium hydroxide.
10cm3 of a diabasic acid was neutralized by 20cm3 of a 0.2M Sodium hydroxide. The molarity of the acid is
1. A
2. B
3. C
4. D
Which one of the following substances can be purified by sublimation?
1. Sulphur
2. Phosphorus
3. Potassium chloride
4. Ammonium chloride.
Lead (II) sulphate can be prepared by the action of dilute sulphuric acid on
1. lead metal .
2. lead (II) oxide
3. lead(II) nitrate
4. lead(Il) carbonate
Calcium carbonate decomposes according to the following equation:

The mass, in grains, of calcium oxide formed when 20g of calcium carbonate completely decomposes is
1. A
2. B
3. C
4. D
The gas which decolourises both potassium manganate (VII) and bromine water is
1. ethene
2. methane
3. carbon dioxide
4. hydrogen chloride
Steam reacts with methane according to the equation:

What volume of gas will remain when 30cm3 of methane is reacted with 20cm3 of steam?
1. A
2. B
3. C
4. D
A concentrated solution of copper(II) chloride was electrolysed using carbon electrodes. Which one of the following substances was produced at the anode?
1. Copper
2. Oxygen
3. Hydrogen
4. Chlorine.
The number of moles of hydrogen atoms present in one mote of ammonium sulphate
is
1. 1
2. 2
3. 4
4. 8
Which one of the following cations when in solution reacts with aqueous potassium hydroxide to form a brown precipitate?
1. Fe3+
2. Al34
3. Fe2+
4. Pb2+
Which one of the following processes decreases the concentration of carbon dioxide in the atmosphere?
1. Rusting
2. Combustion
3. Respiration
4. Photosynthesis.
On reduction, 3.2 g of an oxide of M gave 2.56 g of the element. The simplest formula of the oxide is ( M = 64, O = 16)
1. A
2. B
3. C
4. D
Which one of the following salts in Not soluble in water?
1. magnesium sulphate
2. Magnesium carbonate
3. Magnesium chloride
4. Magnesium nitrate.
The formula of the ion formed when excess sodium hydroxide is added to aqueous aluminum chloride is
1. A
2. B
3. C
4. D
On complete combustion, one mole of butane, C4H10, produces 2877kJ of heat energy. The mass, in grams of butane, which will produce 950kJ of heat energy is
1. 0.3
2. 3.0
3. 19.2
4. 58.0
Which one of the following metals cannot be extracted from its ore by reduction with carbon?
1. Zinc
2. Silver
3. Lead
4. Magnesium
Elements P, Q, R and S have the following electronic configurations: P:2:8 Q: 2: 8: 1 R: 2: 8: 2 and S: 2: 8: 8.
Which pair of elements belongs to the same group in the Periodic Table?
1. P and Q
2. P and S
3. Q and R
4. R and S
Which of the elements P, Q, R and S is an alkaline earth metal?
1. P
2. Q
3. R
4. S
A jar of sulphur dioxide was inverted over ajar of hydrogen sulphide as shown figure 1.

What was observed in the region labeled X?
1. Misty fumes
2. A yellow solid
3. A while solid
4. A colourless liquid
The number of protons in the nucleus of an atom is
1. 5
2. 6
3. 11
4. 16
Which one of the following oxides will dissolve in dilute nitric acid but Not in dilute sodium hydroxide solution?
1. A
2. B
3. C
4. D
Anhydrous zinc chloride can be best prepared by
1. Reacting dilute hydrochloric acid with zinc metal.
2. Reacting dilute hydrochloric acid with zinc oxide.
3. Passing dry hydrogen chloride over zinc metal.
4. Passing dry hydrogen chloride over zinc oxide.
Which one of the following reactions will Not produce hydrogen?
1. Electrolysis of aqueous sodium chloride
2. Passing hydrogen chloride over heated copper turnings.
3. Addition of potassium to cold water.
4. Addition of aluminium to hot aqueous sodium hydroxide.
When compound Y was heated, carbon dioxide was liberated and a residue, which was yellow when cold, remained. Y is

The graph labeled W in figure below shows the variation of the volume of oxygen liberated when 100cm of 2 M hydrogen peroxide decomposed at 250C. Study the graph and answer questions 29 and 30
1. zinc carbonate
2. iron (II) carbonate
3. lead (II) carbonate
4. Sodium carbonate.
To obtain curve V for the same reaction, all other conditions are kept constant except
1. 100cm3 of 1 M hydrogen peroxide is used.
2. The temperature is reduced to 12.50C.
3. Manganese (IV) oxide is added to the peroxide.
4. 200cm3 of 2 M hydrogen peroxide is used.
Curve X is obtained when all other conditions are kept the same except
1. A. 100 cm3 of 1 M hydrogen peroxide is used.
2. B. The temperature is raised to 500 C.
3. C. Manganese (IV) oxide is added to the peroxide.
4. D. 50cm3 of 2 M hydrogen peroxide is used.
ASSERTION - REASON QUESTIONS
Nitric acid can be prepared in the laboratory by reacting concentrated sulphuric with a nitrate because nitric acid is a monobasic acid
1. A
2. B
3. C
4. D
Hydrogen chloride is Not dried over calcium oxide because calcium oxide is a base.
1. A
2. B
3. C
4. D
Burning magnesium continues to bum in a jar of carbon dioxide because burning magnesium decomposes carbon dioxide into carbon and Oxygen.
1. A
2. B
3. C
4. D
Calcium hydrogen carbonate because calcium hydrogen carbonate is an causes permanent hardness of water.
1. A
2. B
3. C
4. D
Graphite conducts electricity because graphite has a giant atomic Structure.
1. A
2. B
3. C
4. D
Concentrated sulphuric acid is a strong dehydrating agent because sulphuric acid has a high affinity for water.
1. A
2. B
3. C
4. D
MULTIPLE COMPLETION QUESTIONS

The atomic numbers of elements X, Y and Z are 12, 8 and 7 respectively. Which of the following compound is / are ionic?
1. A
2. B
3. C
4. D
Chlorine reacts with cold dilute potassium hydroxide to form
1. water
2. potassium chloride
3. potassium hypochlorite
4. potassium chlorate.
Which of the following crystals will show a decrease in mass when exposed in the atmosphere?
1. calcium chloride —6-water
2. copper(II) sulphate —5-water.
3. Iron (II) sulphate —7- water
4. sodium carbonate —10- water.
1. A
2. B
3. C
4. D
To the ashes obtained from the combustion of magnesium in air, water was added and the mixture warmed. The product (s) is/are
1. A
2. B
3. C
4. D
Carbon monoxide
1. bums in air 3. is insoluble in water
2. is a reducing agent 4. forms a white precipitate with lime water.

.
Which of the following gases can be collected by the method shown in figure above?
1. A
2. B
3. C
4. D
In which of the following reactions is oxygen produced?
1. heating copper(ll)nitrate
2. Heating potassium manganate (VII)
3. electrolysis of dilute sulphuric acid using carbon electrodes
4. electrolysis of copper (II) nitrate solution using copper electrodes.
1. A
2. B
3. C
4. D
Concentrated nitric acid
1. liberates carbon dioxide from carbonates
2. is a dehydrating agent.
3. turns litmus red
4. is a reducing agent.
1. A
2. B
3. C
4. D
The reagent(s) which can be used to test for the presence of sulphate ions in solution is / are
1. barium chloride solution
2. potassium iodide solution
3. lead (II) nitrate solution
4. potassium carbonate solution.
1. A
2. B
3. C
4. D
Which of the following nitrates when heated give(s) off nitrogen dioxide?
1. Zinc nitrate
2. silver nitrate
3. calcium nitrate
4. potassium nitrate.
1. A
2. B
3. C
4. D
In the Haber process, the yield of ammonia could be increased by
1. raising the pressure of the gases
2. increasing the temperature of the system
3. pumping more air into the system
4. using an impure iron catalyst.
1. A
2. B
3. C
4. D
The oxide(s) which will dissolve in water to give a solution with pH greater than 7 is / are
An alkali metal W is below potassium in the Periodic Table. W is likely to
1. be coloured
2. be monoatomic
3. form an ion of formula W-
4. form an ion of formula W+
Which of the following equations show(s) a redox reaction?
1. A
2. B
3. C
4. D

Chemistry Test paper 4

Certificate Chemistry Test Papers