Chemistry Past Paper 9th Class 2017 Karachi Board

CHEMISTRY                                                       2017

Time: 3 hours                                                                                         Max. Marks: 85

SECTION “A” (COMPULSORY) (MCQ’s)

1. Choose the correct answer for each from the given options: (17)

1. Oxygen was discovered by:

1. J. Priestly
2. J. Black
3. Cavendish
4. Scheele

2. 5 moles of water is equal to:

1. 80g
2. 90g
3. 100g
4. 180g

3. A reaction in which a chemical substance breaks down to form two or simpler substances is called:

1. Decomposition reaction
2. Addition reaction
3. Displacement reaction
4. Combustion reaction

4. It is the lightest particle:l in the following:

1. Electron
2. Proton
3. Neutron
4. Alpha particle

5. The Atomic number of Fluorine is:

1. 7
2. 9
3. 11
4. 20

6. The sum of the mole fractions of solute and solvent is equal to:

1. 5
2. 2
3. 0
4. 1

7. When molten sodium chloride is electrolyzed, it is formed at the cathode:

1. Sodium
2. Chlorine 
3. Hydrogen
4. Oxygen

8. The electrolyte used in lead storage battery is dilute solution of:

1. HCL 
2. NaCL 
3. H.so
4. HNO

9. Alum is:

1. Single salt
2. Double salt
3. Triple salt
4. Normal salt   

10. In this reaction heat is taken in:

1. Exothermic reaction
2. Endothermic reaction
3. Neutralization
4. Combustion

11. A human being drinks water daily about:

1. 5 litres 
2. 2 litres 
3. 1 litres 
4. 10 litres

12. China clay is used in making of:

1.  Glass
2. Electrical Insulator 
3. Crockery
4. Ceramics

13. The molecular formula of sand is:

1. Si02
2. Si03
3. Na20
4. CaSi03

14. The medal given to third position holder, in any event, is made up of:

1. Bronze
2. Brass
3. Nichrome
4. Copper

15. Natural gas mainly consists of:

1. Ethane
2. Methane
3. propane
4. Butane

16. The general formula for the alkane is:

1. CnH2n
2. CnH 2n+2
3. CnH 2n+1
4. CnH 2n-2

17. The constituent of shoe polish provides shinning in the shoes:

1. Bee Wax
2. Pearlash
3. Soap
4. Sodium Hydroxide

Chemistry Past Paper 9th Class 2017 Karachi Board

SECTION “B” (SHORT-ANSWER QUESTIONS)(42)

NOTE: Answer 14 questions from this section.

2. Write names of any six branches of Chemistry.

click to see the answer of question (2)

3. Define: (i) Empirical Formula (ii) Avogadro’s number (iii) Molar mass

click to see the answer of question (3)

4. Balance the following chemical equation:

(i) KCIO3 —> KCI + O2

(ii) N2 + H2 –> NH3

(iii) CH4 + 02 –> CO2+ H20

5. How many protons and neutrons are pr~sent in the following atoms:

(i) N (ii) Al (iii) Na

6. Define: (i) Dobereiner’s law of Triad (ii) Newland’s law of Octave (iii) Modern Periodic law

click to see the answer of question (6)

7. Write three characteristic properties of Ionic compounds

click to see the answer of question (7)

8. Define: (i) Fusion (ii) Evaporation (iii) Sublimation

click to see the answer of question (8)

9. State Faraday’s First and Second Law of electrolysis.

click to see the answer of question (9)

10. Write three differences between Oxidation & Reduction.

click to see the answer of question (10)

11. Describe the Lewis concept about acids and bases.

click to see the answer of question (11)

12. Define Exothermic and Endothermic reaction. Give one example of each with balanced chemical equations.

click to see the answer of question (12)

13. Compare 3 physical properties of diamond & graphite. 

click to see the answer of question (13)

14. Define Electrolysis and write its two uses. 

click to see the answer of question (14)

15. What is Ozone? Where does it exist in nature and how it is beneficial for earth? 

click to see the answer of question (15)

16. Write the chemical formulae of (i) Copper pyrite (ii) Haematite (iii) Bauxite 

17. Define: (i) Homologous series (ii) Functional group (iii) Isomerism

click to see the answer of question (17)

18. What is soap? Write.names of four kinds of soap.

click to see the answer of question (18)

19. What is the suspension? Write names of four examples of suspension in daily life.

click to see the answer of question (19)

20. A hydrocarbon contains six carbon atoms. Write its molecular formula. If it is:

(i) An alkane (ii) An alkene (iii) An alkyne

21. Calculate the molarity of a solution that contains 2 moles of NaOH dissolved in 0.5 liters of the solution.

22. Define: (i) Radioactivity (ii) Halogens (iii) Allotropy

click to see the answer of question (22)

Chemistry Past Paper 9th Class 2017 Karachi Board

SECTION ‘C’ (DETAILED-ANSWER QUESTIONS)(26)

NOTE: Attempt 2 questions from this section.

23.(a) Describe industrial preparation of Nitric acid by Ostwald’s method with balanced chemical equations.

click to see the answer of question (23.a)

(b) Write two causes of food-spoilage and describe two methods of its preservation.

click to see the answer of question (23.b)

(c) Write four differences between ordinary water and heavy water.

click to see the answer of question (23.c)

24.(a) What are Oxides? Describe the types of normal oxides with one example of each.

click to see the answer of question (24.a)

(b) Describe the extraction of Iron from its Hematite ore in the Blast Furnace. Also, write equation chemical reaction. (Diagram is not required)

click to see the answer of question (24.b)

(c) Write four uses of Sulphuric acid.

click to see the answer of question (24.c)

25. (a) Describe the laboratory method for the preparation of Chlorine gas with a balanced chemical equation and draw labelled diagram also.

click to see the answer of question (25.a)

(b) Write four general properties of transition elements.

click to see the answer of question (25.b)

(c) Define salts and describe three types of salts with examples.

click to see the answer of question (25.c)