Kerala Class 9 Model Question Paper Chemistry

Kerala Board

Sample
Papers

ANNUAL EXAMINATION -
PRACTICE QUESTION PAPER
C H E M I ST RY
Time : 1.30 Hrs STD IX Score : 40

Answer any 4 questions from 1 to 5. Each question carries 1 score. (4 x 1 =4)

1.The chemical and physical properties of elements are periodic functions of their
--------------. 1
2. Which of the following is the balanced chemical equation?
1
a. Mg + O2 → MgO b. Mg + O2 → 2MgO
c. 2Mg + O2 → MgO d. 2Mg + O2 → 2MgO

3. NaCl + AgNO3 → AgCl + NaNO3 , What type of chemical reaction is this?
1
a. Combination reaction b. Decomposition reaction
c. Displacementl reaction d. Double decomposition
4. Which is the correct statement regarding sugar solution?
1
a. It is a homogeneous mixture. b. It is a solid solution
c. The solvent in it is a solid d. It is always a saturated solution
5. When nitrogen dioxide dissolves in rainwater, ------------ is obtained.
1

Answer any 4 questions from 6 to 10. Each question carries 2 score .
(4 x 2 =8)
27
6. Diagrammatically represent the orbit electron configuration
13 of Al
2

7. Mg (Atomic No:12)
a. Write electron configuration of this Atom.
2
b. Find the period and group to which it belongs
8. Solutions of ammonium chloride and sodium hydroxide are taken in a test tube
and heated. 2
a. Which gas is produced?
b. Why does the rate of a chemical reaction increase as temperature increases?

9. Heat the boiling tube containing potassium permanganate.
2
a. Insert a burning matchstick to the mouth of the boiling tube.
What is the observation?
b. Which gas is obtained?

10. Write an example for aromatic hydrocarbons
2
Write its molecular formula.

Answer any 4 questions from 11 to 15. Each question carries 3 score. (4 x 3 =12)

11. Electron configuration of elements P, Q, R are given. (symbols are not real)

P – 2,8,6 Q – 2,8,1 R – 2,8,8
a Which is the most stable element among these?
1
b. What are the valencies of the elements P and Q?
1
c. Write the chemical formula of the compound formed when P and Q combine.
1
12. C + 4HNO3 → 2H2O + CO2 + 4NO2
a. Find out and mark the oxidation number of carbon in this reaction..
1
b. What happens to carbon-oxidation or reduction?
1
c. What are the oxidising agents in this reaction?
1

13. Write the answers to the following questions on the preparation of chlorine
gas in the
laboratory..
a. What are the chemicals required to prepare chlorine gas?
1
b. Chlorine gas is collected by passing it through water. Why?
1
c. Chlorine gas is passed through concentrated sulphuric acid. Why?
1
14. If 10 g common salt is dissolved in 90 g water. Calculate the
concentration in terms of mass percentage?. 3
15. a. How is coal formed in nature? 1
b. Write any two uses of coal. 2

Answer any 4 questions from 16 to 20. Each question carries 4 scores .(4 x 4 =16)

16. The solubilities of certain salts in a saturated solution prepared in 100 g water,
at different temperatures is tabulated below.

Temperature oC – Solubility (g/100 g
Solute water)
80°C
10°C 40°C 60°C
20°C
Potassium nitrate (KNO3) 21 32 62 106 167
Sodium chloride (NaCl) 36 36 36 37 37
Ammonium chloride
24 37 41 55 66
(NH4Cl)

a. Which salt shows the maximum solubility at low temperature?
1
b. How does solubility change when temperature increases?
1
c. What is the amount of solute required to prepare a saturated solution of
potassium 1
nitrate in 50 g water at 40°C?
d. Which salt given in the table does not show much difference in solubility with
varying temperature? 1

17. a. What are the four crystalline allotropes of carbon? 2
b. Which are the electrically conductive allotropes of carbon? 1
c. Which allotrope is used as a lubricant? 1
18. Write two advantages and two limitations of using hydrogen as a fuel.
4
19. Molecular formula of some hydrocarbons are given below.
C3H8, C4H8, C4H10, C3H6
a. Which among these are alkanes? 1
b. What is the general formula of alkenes? 1
c. Write the molecular formula of alkyne having 4 carbon atoms. 1
d. Write the name of this alkyne 1

20. a. A cyclic hydro carbon has a molecular forfule C6H12 .
Draw the structure of this compound. 1
b. Write the condensed formula of the open chain hydrocarbon having

the same molecular formula. 1

c. Give the name of these two compound. 2

Answer Key

Scoring Key
Annual Exam CHEMISTRY (ENG Medium)
Q No Key point Total
SQ Score
NO
1 - Atomic number 1 1
2 - d. 2Mg + O2 → 2MgO 1 1
3 - d. Double decomposition 1 1
4 - a. It is a homogeneous mixture. 1 1
5 - nitric acid /HNO3. 1 1
Max 4 Score

6 2

2, 8, 2 1
7 2
Period - 3 group - 2 ½+½
8 a Ammonia 1 2
b When the reactants are heated, the kinetic energy of the particles
increases./ the number of particles that attain the threshold energy 1
increases/ the number of effective collisions increases ( any one)
a Matchstick burns brightly 1
9 2
b oxygen 1
10 a
Benzene /naphthalene
1 2
b Correct structure 1
Max 8 Score
a R - 2,8,8 /R 1
11 b P valany -2 and Q valancy - 1 ½+½ 3
c Q2P 1
a C 0+ 4HNO3 → 2H2O + C+4O2 + 4NO2 ½+½

12
b oxidation 1 3
c HNO3 1
13 a KMnO4 and HCl 1 3
b To remove hydrogen chloride from chlorine gas 1

c To remove vapour from chlorine gas 1
14 Mass of solution 90g +10g =100g 3 3
Mass percentage = Mass of solute/ Mass of solution x 100
10/100 x100= 10%
a Coal is formed as a result of the carbonisation of plant remains
that lie buried in the soil for years. 1
15 b Used Domestic, indiastrial fual
Used for the manufature of coke, coal tar, coal gas. ( any other two 1+1 3
uses )
Max 12 Score

a Sodium chloride (NaCl) 1
b temperature increases solubility increases 1 4
16
c 31g 1
d Sodium chloride (NaCl) 1
a Diamond, Graphite, Fullerene, Graphene ½x4 4
17
b Graphite, Graphene 1
c Graphite 1
18 Advantages
1.When hydrogen is used as a fuel, the possibility of pollution is 4
very low, since water is the only product formed.
2.High calorific value 4
Limitation
1.Hydrogen is a gas that burns with an explosion.
2. It is difficult to store and distribute hydrogen
19 a C3H8, C4H10 1
b CnH2n 1
4
c C4H6 1
d butyne 1
20
a
4
1

b CH2=CH-CH2-CH2-CH2-CH3 1

c a) cyclohexane b) hexene 1
Max 16 Score

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