Chemistry Test Paper 7

The atomic number of element 7 is 17. In which Group of the Periodic
Table is Z?
1. I
2. II
3. V
4. VII
Which one of the following is a monomer of protein?
1. Glucose
2. Amino acid
3. Isoprene
4. Ethene.
Which one of the following cations when in solution reacts with aqueous
hydroxide to form a precipitate?
1. .
2. .
3. .
4. .
The atomic number of elements, P, Q and R are 12, 8 and 7 respectively.
Which of the following compounds are ionic?
1. .
2. .
3. .
4. .
An hydrous salt R has a relative formula mass of 158 and forms a hydrated
salt with the formula R.nH2O. 79 g of R combined with 45 g of water. The value of n is (H = 1, O = 16)
1. 2
2. 3
3. 5
4. 10
1. .
2. .
3. .
4. .
Which one of the following gases turns potassium dichromate solution green?
1. .
2. .
3. .
4. .
Methane burns in air according to the equation:

The energy liberated when 4g of methane is burnt in air is
1. 222.5 kJ
2. 445.0kJ
3. 1780.0kJ
4. 3560.0kJ
The apparent increase in the mass of copper observed when 0.25 mole of the metal is heated very strongly in air is
1. 4g
2. 8g
3. I6g
4. 20g
Which one of the following dissolves in water to give a solution with a pH less than seven?
1. .
2. .
3. .
4. .
Barium Nitrate solution was added, followed by excess dilute nitric acid to three test-tubes containing solutions of unknown anions. The results obtained are shown below.

Results:
Test tube 1: There was no visible change
Test tube 2 : white precipitate seen which dissolved in excess acid.
Test tube 3: white precipitate seen insoluble in excess acid
Which tube(s) contained an anion?
1. 1 only
2. 8g
3. I6g
4. 20g
Ammonia is obtained from hydrogen and nitrogen according to the equation

The volume of ammonia produced when 251 of nitrogen reacts with excess hydrogen at constant temperature and pressure is
1. 12.51
2. 8g
3. I6g
4. 20g
Which one of the following gases is an oxidizing agent?
1. .
2. .
3. .
4. .
A colourless gas, P, was passed over red - hot lead (ll)oxide as shown in
the diagram below.

When the gas that came off was bubbled through calcium hydroxide solution, a white precipitate was formed. P is
1. hydrogen
2. carbon dioxide
3. butane
4. carbon monoxide.
When Lead nitrate solution reacts with potassium iodide solution it forms a
1. brown solution
2. red solution
3. yellow precipitate
4. white precipitate.
A bottle of copper (II) oxide has been contaminated with some solid
sodium chloride. How can the sodium chloride be removed from the copper (II) oxide?
1. Place me mixture in a separating funnel.
2. Add dilute acid to the mixture and filter.
3. Add aqueous silver nitrate to the mixture.
4. Add water to the mixture and filter.
What mass of sodium hydroxide is in 0.5 litre of 2M sodium hydroxide
solution?
1. l0g
2. 20g
3. 40g
4. 80g
1. .
2. .
3. .
4. .
Hydrogen and nitrogen react according to the following equation.

The volume of nitrogen at s.t.p which will react completely with 6.72 litres ol hydrogen is
1. 2.24 litres
2. 6.72 litres
3. 22.4 litres
4. 67.2 litres
1. .
2. .
3. .
4. .
The graph X below shows the variation in mass with time when 50g of Calcium carbonate powder was reacted with excess 1M HCl at 250C

To obtain graph Y for the same reaction, one would keep all other conditions of the reaction the same but
1. Use 2M hydrochloric acid
2. Use 50g calcium carbonate lumps.
3. Reduce the temperature to 12.5°C.
4. Use 25g of calcium carbonate powder.
The gas that cannot be dried using concentrated sulphuric acid is
1. sulphur dioxide
2. hydrogen sulphide
3. hydrogen chloride
4. carbon monoxide.
Carbon dioxide is normally, Not prepared in the laboratory by the action of
1. nitric acid on calcium carbonate
2. nitric acid on sodium hydrogen Carbonate
3. sulphuric acid on calcium carbonate
4. sulphuric acid on sodium carbonate.
1. 2
2. 3
3. 4
4. 5
Which one of the following substances is used as a catalyst in the reaction
between zinc and dilute sulphuric acid?
1. Copper (II) sulphate
2. Manganese (IV) oxide
3. Vanadium (V) oxide
4. Iron powder.
Chlorine can be prepared in the laboratory by reacting
1. sodium chloride and concentrated ethanoic acid
2. potassium chlorate and concentrated sulphuric acid
3. sodium chloride and concentrated sulphuric acid
4. potassium permanganate and concentrated hydrochloric acid.
Which of the following substances are formed when ammonia is oxidized
by air in Ihe presence of a catalyst?
1. nitrogen and water
2. nitrogen and nitrogen dioxide
3. nitrogen monoxide and water
4. nitrogen and hydrogen.
Which one of the elements below combine directly with nitrogen?
1. Sodium
2. Copper
3. Iron
4. Zinc
6.5g of an element X combine with oxygen to give 8.1g of oxide. The simplest formula of the oxide is (O = 16, X = 65)
1. .
2. .
3. .
4. .
Which one of the following oxides is soluble in water?
1. Lithium oxide
2. lron (III) oxide
3. Aluminium oxide
4. Copper (II) oxide.
Which one of the following substances is produced at the cathode when a
dilute solution of potassium chloride is electrolysed using carbon
electrodes?
1. Potassium
2. Chlorine
3. Hydrogen
4. Oxygen
Which of the following metals can be extracted by reduction of the oxide
with carbon?
1. Potassium
2. Aluminium
3. Zinc
4. Magnesium.
A reaction does Not take place when one of these mixtures is heated.
Which is it?
1. Zinc and Aluminium oxide
2. Zinc and copper oxide
3. Magnesium and Zinc oxide
4. Zinc and lead(II) oxide.
Which one of the following substances does Not sublime when heated?
1. Ammonium chloride
2. Iron(III) chloride
3. Iodine
4. Copper (II) oxide.
Which one of the following reactions does Not take place in the extraction
of iron in the Blast furnace?
1. Carbon monoxide reduces iron (II) oxide to iron.
2. Limestone decomposes to form calcium oxide
3. Coke burns in air forming carbon dioxide
4. Limestone reduces iron (II) oxide to iron.
Solder is an alloy made of
1. Zinc and aluminium
2. Lead and tin
3. Copper and lead
4. Aluminium and copper.
Which one of the following methods can be used to extract magnesium
from its ore?
1. Decomposition by heat
2. Electrolysis
3. Reduction with carbon monoxide
4. crystallization.
A concentrated solution Y was electrolysed using graphite electrodes.
A gas, which turned potassium iodide solution brown, was evolved at one
of the electrodes. Solution Y contained
1. hydrogen ions
2. chloride ions
3. ammonium ions
4. sulphate ions.
Which one of the following equations does Not represent a redox reaction?
1. .
2. .
3. .
4. .
Which one of the following oxides is Not amphoteric?
1. .
2. .
3. .
4. .
1. forms covalent bonds readily with non metals.
2. forms ionic bonds with non-metals.
3. belongs to group II of the Periodic Table.
4. has full shells of electrons.
ASSERTION - REASON QUESTIONS
Each of the questions 42 to 50 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.

Sulphuric acid displaces nitric acid from nitrates because nitric acid is stronger oxidizing agent than sulphuric acid
1. .
2. .
3. .
4. .
Zinc hydroxide is soluble in excess aqueous ammonia because zinc hydroxide is a divalent metal (amphoteric).
1. .
2. .
3. .
4. .
Ethene readily decolourises bromine water because it is saturated
1. .
2. .
3. .
4. .
Barium nitrate solution is used to test for the presence of chloride ions in solution because barium chloride is soluble in water.
1. .
2. .
3. .
4. .
When hydrogen sulphide reacts with moist sulphur dioxide, sulphur is deposited because sulphur dioxide is a stronger reducing agent than hydrogen sulphide.
1. .
2. .
3. .
4. .
Chlorine water bleaches wet dyes because hypochlorous acid supplies oxygen to wet dyes.
1. .
2. .
3. .
4. .
Concentrated sulphuric acid reacts with oxalic acid to produce carbon dioxide, carbon monoxide and water because concentrated sulphuric acid dehydrates oxalic acid.
1. .
2. .
3. .
4. .
Water and alcohol can be separated by fractional distillation because they have different boiling points.
1. .
2. .
3. .
4. .
Ammonia gas turns moist red litmus paper blue because it is an acidic gas.
1. .
2. .
3. .
4. .

Chemistry Test Paper 7

Quiz