Chemistry Test Paper 8

Which of the following statements is true when a solid is changing into a liquid?
1. The temperature increases as energy is increased
2. The temperature remains constant as energy is increased
3. The temperature drops as energy is increased
4. The temperature remains constant as the energy decreases
Which one of the following pairs i-f gases are removed first before air is liquefied?
and nitrogen
1. Nitrogen and oxygen
2. Water vapour and carbon dioxide
3. Carbon dioxide and oxygen
4. Water vapour
Zinc react- with hydrochloric acid according to the following equation

Determine the volume of hydrogen gas liberated at s.t.p when 13 g of zinc
react with excess hydrochloric acid ( Zn = 65, )

Pick the answer from the above
1. A
2. B
3. C
4. D
The gas formed when chlorine water is exposed to sunlight is
1. oxygen
2. hydrogen
3. chlorine
4. hydrogen chloride
The products of the reaction between concentrated sulphuric acid and copper are
1. water and copper (II) sulphate
2. water, sulphur dioxide and copper (II) sulphate
3. water, copper (II) sulphate and hygrogen
4. sulphur dioxide and copper (II) sulphate
The solubility of salt W is 35 g per 100 cm3of water at 20°C. The mass of W in 40 cm3 of water at the same temperature is
1. 7.0 g
2. 14.0 g
3. 87.5 g
4. 134.3 g
80 cm3 of hydrogen and 80 cm3 of oxygen are allowed to react. What
volume of gas remains unreacted?
1. 40cm3
2. 80cm3
3. 120cm3
4. 160cm3
In the preparation of hydrogen from zinc and hydrochloric acid, the rate of
reaction is increased by adding.
1. nickel
2. copper sulphate
3. platinum
4. manganese dioxide
The atomic number of aluminum ion is 13. The electronic
configuration of the aluminum is
1. 2 : 8
2. 2: 8 : 3
3. 2 : 8 : 6
4. 2 : 8 : 8
0.02 moles of calcium chloride (CaCl2) is dissolved to make 200 cm3 of solution.
What is the concentration of chloride ions in moles per litre in this solution?
1. 0.05 M
2. 0.1 M
3. 0.2 M
4. 0.3 M .
During electrolysis, 0.005 and 0.015 moles of clement Y and hydrogen are produced respectively, what is the valence of Y likely to be?
1. 1
2. 2
3. 3
4. 4.
The number of neutrons in the atom of element Y represented by 213 Y is 84
1. 84
2. 129
3. 213
4. 297
Which one of the following is the least effective substance for putting
off a petrol fire?
1. Water
2. Powders
3. carbon dioxide
4. Volatile liquids
1. A
2. B
3. C
4. D
Which one of the following observations would be made it' a clean magnesium ribbon is added to copper (II) sulphate solution?
1. The ribbon would dissolve and blue solution would fade.
2. The ribbon would dissolve and a colourless solution formed
3. The ribbon would dissolve and no colour change would occur
  blue solution maintained and brown solid formed
4. The ribbon would dissolve, the
Which one of the following substances has giant ionic structure?
1. Sodium chloride
2. Hydrogen chloride
3. Graphite
4. Diamond
Carbon reacts with sulphur according to the following equation.

The amount of heat absorbed when 16 g of sulphur reacts with excess carbon is
1. 7kJ
2. 29kJ
3. 58 kJ
4. 116 kJ
The volume of 0.2 M sodium hydroxide solution that neutralizes 25 cm3 of 0.1 M hydrochloric acid is
1. A
2. B
3. C
4. D
Which of the following types of water would take the greatest amount of soap solution to form lather using the same volume of each type?
1. Rain water
2. Distilled led water
3. Sea water
4. River water
Nitrogen monoxide reacts with oxygen according to the following equation
1. 100 cm3
2. 200 cm3
3. 300 cm3
4. 400 cm3
Which one of the following is a synthetic polymer?
1. Wool
2. Cotton .
3. Silk
4. Nylon
Which one of the following equations of is a redox reaction.
1. A
2. B
3. C
4. D
Which one of the following mixtures would not form a precipitate?
1. Barium nitrate and sodium sulphate
2. Lead nitrate and potassium iodide
3. Copper nitrate and sodium sulphate
4. Silver nitrate and potassium bromide
Sulphur dioxide reacts with oxygen to form sulphur trioxide according to the equation
1. low pressure and low temperature
2. high pressure and high temperature
3. low pressure and high temperature
4. high pressure and low temperature
1. have same number of protons.
2. have the same number of electrons
3. are atoms of the same element
4. have the same number of neutrons.
Which one of the following hydroxides will dissolve in excess ammonia?
1. A
2. B
3. C
4. D
Which one of the following colours is observed when sodium is burnt in air?
1. Blue
2. Yellow
3. Green
4. Purple
The results of the chromatograph of the dyes used in making three sweets X. Y and Z is shown in figure below

X Y Z

The number of dyes used in making the sweets is
1. 3
2. 4
3. 5
4. 9
Which one of the following nitrogen compounds contain the least amount of nitrogen? (H = I, C = 12, O = 16, N = 14)
1. A
2. B
3. C
4. D
Which one of the following contains the same number of atoms as 8 g of sulphur) (C = 12, S = 32, Ca = 40)
1. 20g calcium
2. 10g calcium
3. 12g carbon
4. 4g carbon
MULTPLE COMPLETION QUESTIONS
Which one of the following substances can be displaced by chlorine in a chemical reaction?

1. Flourine
2. Iodine
3. Hydrogen
4. Bromine
1. A
2. B
3. C
4. D
How does soap differ from a detergent?
1. A detergent is made from vegetable oil but soap from animal oil
2. A detergent is not efficient with hard water
3. A detergent is in powder form only
4. Soap is not efficient with hard water.
1. A
2. B
3. C
4. D
When sodium hydroxide solution is added to a solution of nitric acid in a beaker, which of the following takes place? The
1. PH of mixture in beaker increases.
2. PH of mixture in beaker decreases
3. Hydroxide ions neutralize some hydrogen ions
4. Hydrogen ion concentration increases.
1. A
2. B
3. C
4. D
Iron is prevented from rusting by
1. Greasing
2. Electroplating
3. Galvanizing
4. Chlorinating
1. A
2. B
3. C
4. D
Which one of the (blowing are mixtures?
1. Diamond
2. Brass
3. Aluminum
4. Steel
1. A
2. B
3. C
4. D
Which one of the following is/are observed when lead (II) nitrate is heated in a test tube?
1. Reddish - brown residue
2. Brown fumes
3. Gas that relights a glowing splint
4. Liquid formed on the cold part of the tube.
1. A
2. B
3. C
4. D
Which one of the following substances in aqueous solution will turn litmus red?
1. Sodium chloride
2. Sulphur dioxide
3. Sodium ethanoatc
4. Carbon dioxide
1. A
2. B
3. C
4. D
Which one of the following carbonates arc soluble in water?
1. Sodium carbonate
2. Potassium carbonate
3. Ammonium carbonate .
4. Calcium carbonate
1. A
2. B
3. C
4. D
Magnesium is in group (II) of the periodic table. Magnesium oxide has
1. an ionic structure
2. a molecular structure
3. a high melting point
4. a low melting point
1. A
2. B
3. C
4. D
Which of the following is/are the purest form (s) of iron?
1. Steel
2. Pig-iron
3. Slag
4. Wrought iron
1. A
2. B
3. C
4. D
ASSERTION - REASON QUESTIONS

Graphite and diamond are allotropes of carbon, because they are both black
1. A
2. B
3. C
4. D
When chlorine is bubbled into potassium iodide solution, iodine is liberated because Iodine is less reactive than chlorine
1. A
2. B
3. C
4. D
Soap can remove both dirt and oil from cloth because Soap is made from cooking oil.
1. A
2. B
3. C
4. D
The presence in water of dissolved sodium hydrogen Carbonate does not make water hard because all sodium salts are soluble.
1. A
2. B
3. C
4. D
Concentrated sulphuric acid is used to dry ammonia gas because It is hygroscopic
1. A
2. B
3. C
4. D
When ethane burns in air, it produces a smoky flame because of the present of unburnt carbon
1. A
2. B
3. C
4. D
Carbon dioxide puts off burning magnesium BECAUSE Carbon dioxide does not support combustion
1. A
2. B
3. C
4. D
The amount of carbon dioxide in the air is approximately constant because Carbon dioxide is produced during burning
1. A
2. B
3. C
4. D
Sodium metal is stored under oil because it reacts with light.
1. A
2. B
3. C
4. D
Sulphur dioxide is added as a preservative to foodstuffs and fruit squashes because It is soluble in water
1. A
2. B
3. C
4. D

Chemistry Test Paper 8

Self Test