Chemistry objectives Test Paper 2

Which one of the following mixtures is best separated by chromatography?
1. ink
2. Crude petroleum
3. Water and oil
4. water and ethanol.
Which one of the following oxides is soluble in excess sodium hydroxide solution and in excess aqueous ammonia?
1. PbO
2. ZnO
Which one of the following gases is a major sewerage product?
The volume of 0.01 M sodium hydroxide solution is required to react exactly with 25.0cm3 of 0.02M hydrochloric acid is
1. 12.5cm3
2. 25.0cm3
3. 50.0cm3
4. 75.0cm3
Solution X forms a white precipitate with silver nitrate solution. The precipitation is insoluble in nitric acid X is likely to contain.
2. CI-
4. Phosphorus
Which one of the following reactions does Not normally require a catalyst?
1. production of oxygen from hydrogen peroxide.
2. Synthesis of sulphur trioxide from sulphur dioxide and oxygen.
3. Synthesis of ammonia from nitrogen and hydrogen.
4. Production of chlorine from manganese (IV)oxide and concentrated hydrochoric acid.
Which one of the following substances has a giant atomic structure?
1. Sulphur
2. Iodine
3. Diamond
4. Phosphorus
The mass of nitric acid (HNO3) required to make 200cm3 of a 2M solution is
1. 31.5g
2. 25.2g
3. 15.8g
4. 12.6 g
Which one of the following set up of apparatus can be used for the preparation of ammonia solution?
Which one of the following nitrates does Not give off brown fumes when heated?
1. Mg(NO3)2
2. NaNO3
3. Ca(NO3)2
4. Ba(NO3)2
Which one of the following is an electronic configuration of an atom of an i gas?
1. 2:8:8
2. 2:8:7
3. 2:8:6
4. 2:8:8:1
Copper(II)carbonate when heated in air decomposes according to the equation

What volume of carbon dioxide is produced at s.t.p when 0.5mole of copper oxide is formed?
1. 112.0l
2. 44.O l
3. 22.4 l
4. 11.2 l
The number of neutrons in the nucleus of an atom
1. 17
2. 20
3. 37
4. 54
An oxide of metal Z reacts with magnesium when heated but it does Not react with copper. The order of reactivity of Z, magnesium and copper starting wi most reactive is
1. Cu, Z, Mg
2. Z, Mg, Cu -
3. Mg, Cu, Z
4. Mg, Z
Which of the following formulae represents an alkene?
1. C3H8
2. C3H6
3. C2HZ
4. C2H6
5.3kJ of heat energy are required to vaporize 13g of a liquid of relative molecule mass 78. The heat of vaporization of the liquid in kJmol-1 is
1. 78.0
2. 68.9
3. 31.8
4. 11.3
Which one of the following substances sublimes when heated?
1. ZnO
2. CaCl2
3. I2
4. P
Hot excess concentrated sulphuric acid reacts with ethanol to give a gas which decolourises bromine water. The gas is
1. methane
2. ethene
3. ethyne
4. ethane.
The atomic numbers of elements Q, R, S, T are 8, 9, 13 and 1 7 respectively, which one of the following pairs of elements belong to the same group in the periodic table?
1. Q and R
2. Q and S
3. R and T
4. S and T
Which one of the following salts can be prepared by neutralization?
1. CaSO4
2. PbSO4
3. ZnSO4
4. (NH4)2SO4
The mass of copper deposited when 240 coulombs of electricity is used in the electrolysis of copper (II) sulphate is
Which one of the following compounds dissolves in water to give a solution with a pH greater than 7?
1. CH3COONa
2. XH4CI
3. CO2
4. SO2
The red brown coating formed when iron nail is left in moist air for a long time is
1. hydrated iron(II) oxide
2. hydrated iron (III) oxide
3. anhydrous iron (II) oxide
4. anhydrous iron(III) oxide.
Which of the following gases turns a solution of potassium dichromate (VII) green?
1. C12
2. NO2
3. CO2
4. SO2
Which one of the following hydroxides when exposed to air turns brown?
1. Pb(OH)2
2. Fe(OH)2
3. Zn(OH)2
4. Mg(OH)2
Which one of the following methods is normally used to prepare hydrogen in the laboratory?
1. Electrolysis of water
2. Action of water on magnesium
3. Action of dilute hydrochloric acid on iron
4. Action of steam on zinc
An oxide of an element X is made up of 50% X. The simplest formula of the oxide is ( X = 32, O = 16)
1. XO
2. X2O
3. XO2
4. X2O3
A carbonate of an element Y has the formula Y3(CO3) 3. To which group in the Periodic Table docs Y belong?
1. 1
2. 2
3. 3
4. 4.
Which one of the following metals can burn in both oxygen and carbon dioxide?
1. Al
2. Ca
3. Fe
4. Mg.
Which one of the following equations does Not represent reduction reaction?
Which one of the following reagents is used for softening hard water?
1. Na2CO3
2. Na2SO4
3. CaCO
4. CaSO4
When a stream of ajr is passed through sodium hydroxide solution and then over heated copper, the residual gas is mainly
1. Ne
2. CO2
3. O2
4. N2
The reaction between dilute hydrochloric acid and magnesium ribbon is fast at the beginning and gradually slows down there after. This observed gradual decrease in the rate of reaction is due to the
1. gradual decrease in the number of hydrogen ions during the reaction
2. insolubility of magnesium chloride being produced
3. increase in the pressure above the reaction vessel brought about by the hydrogen gas being produced
4. endothermic reaction between magnesium ions and chloride ions
Methane burns in oxygen according to the equation

If 10cm3 of methane and 20cm3 of oxygen are mixed and exploded and final products cooled to room temperature, the final gaseous volume is
1. 10cm3
2. 15cm3
3. 25cm3
4. 30cm3
MULTIPLE COMPLETION QUESTIONS
Element Y burns with a yellow flame and reacts vigorously with water producing an alkaline solution and a gas that gives a pop sound with a lighted splint. Which of the following is / are correct?
1. Y could be a group 1 element
2. the gas given off is hydrogen
3. Y burns in air forming a basic oxide
4. Y will most likely form a covalent chloride
1. A
2. B
3. C
4. D
When water is added to quick lime
1. heat is given off
2. there is a hissing sound
3. the quick lime crumbles to powder
4. the quick lime dissolves
1. A
2. B
3. C
4. D
Which of the following substances are efflorescent ?
1. MgSO4.7H2O
2. Na2B2O7. 10H2O
3. NaCO3 ,10H2O
4. CaCl2.2H2O
1. A
2. B
3. C
4. D
Which of the following are mixtures?
1. diamond
2. brass
3. aluminium
4. steel
1. A
2. B
3. C
4. D
When copper (II) sulphate solution is electrolysed using platinum electrodes
1. copper is formed at the anode
2. the colour of the solution remains unchanged
3. oxygen is produced at the cathode
4. the final solution is acidic
1. A
2. B
3. C
4. D
Which of the following conditions does Not affect (he rate of the reaction between lumps of calcium carbonate and dilute hydrochloric acid?
1. grinding the calcium carbonate
2. adding iron powder to the mixture
3. warming the reaction mixture
4. exposing the reaction mixture to light
1. A
2. B
3. C
4. D
When magnesium is burnt in air
1. there is an increase in mass
2. bright light is observed
3. magnesium nitride is formed
4. there is a decrease in mass
1. A
2. B
3. C
4. D
Ionic compounds are generally
1. conductors of electricity when in molten state only
2. soluble in water
3. soluble in all solvents
4. have high melting points
1. A
2. B
3. C
4. D
Which of the following compounds is /are used in the purification of water?
1. Calcium hypochlorite.
2. Calcium chloride.
3. Chlorine gas.
4- Carbon dioxide gas.
1. A
2. B
3. C
4. D
Which of the following salts when in solution will form a white precipitate with dilute hydrochloric acid?
1. Zn(NO3)2
2. AgNO3
3. Ca(NO3)2
4. Pb(NO3)2
1. A
2. B
3. C
4. D
Which of the following substances can be displaced by chlorine in a chemical reaction?
1. Fluorine.
2. Iodine.
3. Hydrogen.
4. Bromine.
1. A
2. B
3. C
4. D
ASSERTION-REASON QUESTIONS
During the electrolyis of brine by carbon electrodes chlorine is liberated at the anode, Because chloride ion is higher in the using electrochemical series than hydroxide ion
1. A
2. B
3. C
4. D
Ammonium chloride and sodium chloride are separated by sublimation Because sodium chloride has lower melting point than
ammonium Chloride
1. A
2. B
3. C
4. D
When sulphur dioxide reacts with Iron (III) sulphate, the solution turns from brown to green Because Sulphur dioxide is oxidized by iron (III) ions
1. A
2. B
3. C
4. D
Water purified by filtration is made Suitable for drinking by adding alum (potassium aluminium sulphate) Because Alum kills all the bacteria in the water
1. A
2. B
3. C
4. D
Rubber is more elastic than polyethene Because Rubber is a natural polymer
1. A
2. B
3. C
4. D

Chemistry objectives Test Paper 2

Certificate Chemistry Test Papers