Chemistry Test Paper 11

The solubility of a solute can be increased by
1. agitating the mixture
2. adding more solute
3. adding more solvent
4. increasing the temperature,
Sodium carbonate and sodium hydrogen carbonate con be separated by fractional crystallization because the two salts have different
1. densities
2. solubilities
3. melting points
4. boiling points.
Which one of the following hydrocarbons has a 90% carbon content (C=12, H=l)7
1. .
2. .
3. .
4. .
Two elements have atomic numbers 14 and 8 respectively. The compound formed when they react is most likely to be
1. Crystalline with a high melting point.
2. A good conductor of electricity.
3. Basic in nature
4. A molecular gas.
Which one of the following is Not used as a fossil fuel?
1. Hydrogen
2. Charcoal
3. Coal
4. Ethanol.
Which one of the following is an oxidation process?
1. Combustion
2. Hydrogenation
3. Neutralisation
4. Saponification.
Which one of the following aqueous solutions will produce hydrogen gas with a magnesium ribbon? That of
1. pH=14
2. pH = 7
3. pH=ll
4. pH = 2
15g of an oxide of lead is strongly heated in a stream of hydrogen gas, leaving 13g of metallic lead. (Pb = 207, O = 16). The simplest formula of the oxide is
1. .
2. .
3. .
4. .
What mass of ethane gas (C2H6) Mr. = 30 will occupy the same volume as 8g of methane gas (Cm) Mr. = 16 at at s.t.p?
Which one of the following structures has a giant ionic structure?
1. Sodium chloride
2. Hydrogen chloride
3. Zinc carbonate
4. Monoclinic sulphur.
Which one of the following carbonates decomposes to leave a metal?
1. Potassium carbonate
2. Magnesium carbonate
3. Zinc carbonate
4. Silver carbonate.
Concentrated sulphuric acid reacts with ethanol to form ethene. This shows that
1. the acid is an oxidizing agent.
2. Ethene can be converted to ethanol
3. Ethene has a higher affinity for the acid
4. The acid is a dehydrating agent.
Which one of the following reagents is used to test for sulphur dioxide?
1. Chlorine water
2. Acidified potassium permanganate
3. Cobalt chloride
4. An hydrous copper sulphate.
The rate of the chemical reaction between calcium carbonate and hydrochloric acid can be determined by the
1. concentrated of carbon dioxide produced
2. temperature of carbon dioxide produced
3. volume of carbon dioxide produced
4. pressure of carbon dioxide produced.
Sodium burns in excess air forming
1. sodium oxide
2. sodium peroxide
3. sodium hydroxide
4. sodium hydride
Which one of the following gases is obtained by fractional distillation?
1. Oxygen
2. Ammonia
3. Sulphur dioxide
4. Hydrogen.
When hydrogen is passed over heated copper (II) oxide, a brown solid is formed. This shows that
1. copper is above hydrogen in the activity series.
2. Copper is an oxidizing agent.
3. Hydrogen is an reducing agent.
4. Hydrogen is inert towards metals.
Electrolysis is applied in
1. refining of crude oil
2. vulcanization of rubber.
3. synthesis of polythene
4. manufacture of sodium hydroxide.
What is the mass of sulphuric acid (Mr = 98) in 5cm3 of a 0.2M solution of the acid?
1. .
2. .
3. .
4. .
6.5g of an element M. combines with excess oxygen to give 8.1g of the oxide. The simplest formula of the oxide is (M = 65, O = 16).
1. .
2. .
3. .
4. .
1. .
2. .
3. .
4. .
The best method for separating a mixture of ammonium chloride and sodium chloride is
1. decantation
2. filtration
3. distillation
4. sublimation.
The mass of 560cm3 of a gas s.t.p is 1.10g. The relative formula mass of the gas is (molar gas volume at s.t.p is 22.4 dm3)
A white solid formed when lime water is left exposed lo air for sometime is
1. calcium carbonate
2. calcium oxide
3. calcium hydroxide
4. calcium chloride.
Which one of the following metals reacts with nitrogen when heated?
1. Lead
2. silver
3. Copper
4. Magnesium.
A compound reacts with concentrated sulphuric acid to give a colourless gas. which fumes with ammonia. The compound contains
1. chloride
2. carbonate
3. nitrate
4. sulphate.
Carbon monoxide reacts with hydrogen according to the equation:
CO(g) + 2H2(g) CH3OH(i). H = + 9l kJ.
What mass of carbon monoxide would cause a heat change of + 182 kJ.
1. 2g
2. 28g
3. 56g
4. 273g
Increasing concentration increases the rate of a reaction because the particles.
1. move faster
2. collide more often.
3. have more energy .
4. collide with more force
The formula of rust is
1. .
2. .
3. .
4. .
Which one of the following substances will react with magnesium to give hydrogen?
1. Dilute hydrochloric acid
2. Aqueous ammonia
3. Potassium hydroxide
4. Ethanol.
A compound has the formula M2(PO4)3 To which group of the periodic table does the clement M belong?
1. II
2. III
3. 1V
4. V
13.70kJ of heat was evolved when 4.0g of copper was displaced from copper (II) sulphate solution by zinc. The amount of heat evolved when one mole of copper was displaced is ( Cu = 63.5)
The element M belongs to group IV in the periodic table. The formula of the oxide of M is
1. .
2. .
3. .
4. .
Which one of the metal atoms whose electronic structures given below forms a nitrate of the type of M(NO3)2?
1. 2: 8: 0
2. 2: 8: 1
3. 2: 8: 2
4. 2: 8: 3.
Which one of the following substances is an example of an allotrope?
1. Copper
2. Bronze
3. Sulphur
4. Solder.
Which one other following atomic numbers will indicate the least reactive
element?
1. 2:8:1
2. 2:8:2
3. 2:8:7
4. 2:8:8
An example of a non-biodegrable substance is
1. Silk
2. Wool
3. Polythene
4. Paper.
Dry air was passed through sodium hydroxide solution then over heated copper metal. The residual gas consists of
1. oxygen
2. carbon dioxide
3. water vapour
4. nitrogen
Which one of the following oxides is amphoteric?
1. Calcium oxide
2. aluminium oxide
3. Sodium oxide
4. Copper oxide
During the extraction of Sodium, the reaction that takes place a the anode is
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.

Graphite is a soft substance because it has weak interrmolecular forces.
1. .
2. .
3. .
4. .
42. In the contact process sulphur trioxide is dissolved in concentrated sulphuric acid instead of water because sulphur trioxide fumes in water giving out a lot of heat.
1. .
2. .
3. .
4. .
A 2M ethanoic acid is a weak acid because the acid ionizes only slightly in water.
1. .
2. .
3. .
4. .
Iodine is formed when chlorine Gas is bubbled into a solution of potassium iodide because chlorine gas reduces the iodide ions into the solution
1. .
2. .
3. .
4. .
Sulphuric acid is a strong acid because sulphuric acid is highly molecular.
1. .
2. .
3. .
4. .
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.

Iron is prevented from rusting by
1. greasing
2. electroplating
3. galvanizing
4. neutralising
1. .
2. .
3. .
4. .
Ammonia gas may be dried using ,
1. concentrated sulphuric acid
2. calcium hydroxide
3. calcium chloride
4. calcium oxide.
1. .
2. .
3. .
4. .
Which of the following contains the same volume as 8.0g of oxygen at s.t.p?
1. I 7.Og of ammonia
2. 22.0g of carbon dioxide
3. 2.Og of hydrogen
4. 14.Og nitrogen.
1. .
2. .
3. .
4. .
A calcium ion possesses
1. 20 protons
2. 22 electrons
3. 20 neutrons
4. 40 neutrons.
1. .
2. .
3. .
4. .
When hydrogen reacts with copper (II) oxide
When hydrogen reacts with copper (II) oxide
1. copper (II) oxide is reduced
2. hydrogen is reduced
3. hydrogen is oxidized
4. copper is oxidized.
1. .
2. .
3. .
4. .

Chemistry Test Paper 11

KAWA Chemistry Quiz