S2 C
KBTC International School
Examination and Evaluation Board
NAME
ROLL NUMBER
LEVEL
Secondary - 2
BATCH NUMBER
Dual Batch 1
EXAM
MID - YEAR
CHEMISTRY
DECEMBER 2023
50 Marks
1 hour 30 mins
READ THESE INSTRUCTIONS FIRST.
Write your answers in the space provided.
Write in dark blue and black pen.
You may use an HB pencil for any lines, diagrams
or graphs.
Do not use correction fluid.
100
ANSWER ALL QUESTIONS.
Score
This document consists of (7) pages.
[1]
SECTION A (15 × 1 = 15 marks)
Choose the correct answers for the following statements. Write only the letters of the
correct answers.
1. If temperature increases, the solubility of __________ also decreases.
(A) sugar
(B) methane
(C) alcohol
1. _____________
2. The liquid P is colorless liquid that contain acetone and water. The liquid R contain fat
globules and opaque. If so, the true solution is(are) ____________.
(A) liquid P
(B) liquid R
(C) both liquid P and liquid Q
2. _____________
3. Which of the following general equation represent neutralization reaction?
(A) base reacts with acid
(B) metal reacts dilute acid
(C) metal reacts with water
3. ____________
4. Brass is alloy that is made up of copper and zinc. It is an example of __________.
(A) gas solution
(B) liquid solution
(C) solid solution
4. _____________
5. Vinegar is a mixture of acetic acid and water. These two liquids can be separated by
________.
(A) evaporation
(B) distillation
(C) centrifugation
5. ____________
6. If small amount of acid is added into certain amount of water, the resulting solution is
called ______.
(A) dilute solution
(B) concentrated solution
(C) saturated solution
6. ____________
7. Which of the following is a homogeneous mixture?
(A) salad
(B) pizza
(C) vinegar
7. ___________
8. Different kinds of plant pigments can be separated by paper chromatography based on
their _____________.
(A) colour
(B) density
(C) solubility
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8. ___________
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[2]
9. The state of atmosphere at a particular place during a short periodic of time is known
as_________.
(A) meteorology
(B) climate
(C) weather
9. _____________
10. Which of the following chemical compound is found in animal’s shells?
(A) sodium carbonate
(B) calcium carbonate
(C) magnesium carbonate
10. ____________
11. In combustion of fossil fuels, they react with oxygen in air and produce _________.
(A) carbon dioxide and water
(B) hydrogen chloride and water
(C) phosphorus pentoxide and water
11. ____________
12. The purity of ________ gold is 58.33%.
(A) 9 carat
(B) 24 carat
(C) 14 carat
12, ____________
13. Which element may cause a diamond to be black?
(A) Nitrogen
(B) Boron
(C) Graphite
13. ____________
14. When zinc and dilute hydrochloric acid is combined, zinc chloride and _________gas
would be formed.
(A) oxygen
(B) hydrogen
(C) carbon dioxide
14. ____________
15. Which of the following climate zone has hot and wet climate all the year?
(A) Tropical
(B) Temperate
(C) Arid
15. ____________
SECTION B ( 5 × 3 = 15 marks)
Questions 16 to 20 carry 3 marks each.
16. The following diagram shows structure of carbon atom.
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[3]
(a) Name three particles Y and Z.
Particle Y = ______________
Particle Z = _______________
(b) What is the core center of this atom?
___________________________________________________________________
(c) Is this atom neutral or not? Why?
___________________________________________________________________
___________________________________________________________________
17. (a) Which elements are present in carbonic acid?
____________________________________________________________________
(b) Give the names of two soluble salts that are made from carbonic acid.
___________________________________________________________________
___________________________________________________________________
18. A student prepared the copper sulfate solution and measure mass of copper sulfate
solution. The diagram shows how she has prepared the solution.
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[4]
(a) What is the mass of copper sulfate?
____________________________________________________________________
(b) What would happen if the temperature of water is increased?
_____________________________________________________________________
(c) Which method could be used to obtain copper sulfate from its solution?
______________________________________________________________________
19. (a) What are greenhouse gases?
____________________________________________________________________
____________________________________________________________________
(b) What would happen when the amount of greenhouse gases increases in atmosphere?
_____________________________________________________________________
_____________________________________________________________________
(c) How can we know the total amount of greenhouse gases in atmosphere?
_____________________________________________________________________
20. The core of peat has been removed from a bog. Scientists will study the pollen found in
the core. The end nearer to the left of the picture is from the top of the bog.
(a) Is the oldest peat from the top or the bottom of the bog?
__________________________________________________________________
__________________________________________________________________
(b) Why has the plant material, including pollen, not rotted in the peat bog?
_____________________________________________________________________
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[5]
(c) What instrument is used to take sample of peat bogs?
____________________________________________________________________
SECTION C ( 4 × 5 = 20 marks)
Questions 21 to 24 carry 5 marks each.
21. Copy and complete the following equations. (In words)
(a) Iron + oxygen 
_____________________________________________________________________
(b) zinc + steam 
_____________________________________________________________________
(c) calcium chloride + sodium carbonate 
_____________________________________________________________________
(d) magnesium + sulfuric acid 
_____________________________________________________________________
_____________________________________________________________________
(e) potassium hydroxide + hydrochloric acid 
_____________________________________________________________________
_____________________________________________________________________
22. (a) What is the general chemical name of natural gas?
_____________________________________________________________________
(b) Which elements are combined in natural gas?
____________________________________________________________________
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[6]
(c) Is the natural gas renewable or non-renewable resource? Why?
____________________________________________________________________
(d) What substances would be obtained when natural gas burn in air? Give an equation
for burning of natural gas burn.
___________________________________________________________________
___________________________________________________________________
23. Joseph and his friends have done an experiment for reaction of calcium carbonate with
sulfuric acid.
X
(a) What type of salt would be formed after reaction?
__________________________________________________________________
(b) Gas X is formed after reaction. Name the gas X.
____________________________________________________________________
(c) What is the chemical name of lime water?
_____________________________________________________________________
(d) Give a chemical equation in words for the reaction of calcium carbonate and sulfuric
acid.
____________________________________________________________________
____________________________________________________________________
(e) What happen when the gas X is combined with lime water?
____________________________________________________________________
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[7]
24. The table below gives the colors and solubility in water of four compounds.
Name of salt
Color
Solubility
Calcium chloride
white
soluble
Magnesium carbonate
white
insoluble
Copper sulfate
blue
soluble
Silver carbonate
yellow
insoluble
The compounds were added to separate beakers of water. There was enough water to
dissolve the soluble compounds completely. The contents of each beaker were filtered.
(a) What are the residues after filtration?
_____________________________________________________________________
_____________________________________________________________________
(b) What is the color of filtrate after filtration? Why?
_____________________________________________________________________
_____________________________________________________________________
(c) How would you obtain the crystals of salts from filtrate?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
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