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:
- J. Priestly
- J. Black
- Cavendish
- Scheele
2. 5 moles of water is equal to:
- 80g
- 90g
- 100g
- 180g
3. A reaction in which a chemical substance breaks down to form two or simpler substances is called:
- Decomposition reaction
- Addition reaction
- Displacement reaction
- Combustion reaction
4. It is the lightest particle:l in the following:
- Electron
- Proton
- Neutron
- Alpha particle
5. The Atomic number of Fluorine is:
- 7
- 9
- 11
- 20
6. The sum of the mole fractions of solute and solvent is equal to:
- 5
- 2
- 0
- 1
7. When molten sodium chloride is electrolyzed, it is formed at the cathode:
- Sodium
- Chlorine
- Hydrogen
- Oxygen
8. The electrolyte used in lead storage battery is dilute solution of:
- HCL
- NaCL
- H.so
- HNO
9. Alum is:
- Single salt
- Double salt
- Triple salt
- Normal salt
10. In this reaction heat is taken in:
- Exothermic reaction
- Endothermic reaction
- Neutralization
- Combustion
11. A human being drinks water daily about:
- 5 litres
- 2 litres
- 1 litres
- 10 litres
12. China clay is used in making of:
- Glass
- Electrical Insulator
- Crockery
- Ceramics
13. The molecular formula of sand is:
- Si02
- Si03
- Na20
- CaSi03
14. The medal given to third position holder, in any event, is made up of:
- Bronze
- Brass
- Nichrome
- Copper
15. Natural gas mainly consists of:
- Ethane
- Methane
- propane
- Butane
16. The general formula for the alkane is:
- CnH2n
- CnH 2n+2
- CnH 2n+1
- CnH 2n-2
17. The constituent of shoe polish provides shinning in the shoes:
- Bee Wax
- Pearlash
- Soap
- 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
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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
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7. Write three characteristic properties of Ionic compounds
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8. Define: (i) Fusion (ii) Evaporation (iii) Sublimation
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9. State Faraday’s First and Second Law of electrolysis.
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10. Write three differences between Oxidation & Reduction.
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11. Describe the Lewis concept about acids and bases.
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12. Define Exothermic and Endothermic reaction. Give one example of each with balanced chemical equations.
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13. Compare 3 physical properties of diamond & graphite.
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14. Define Electrolysis and write its two uses.
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15. What is Ozone? Where does it exist in nature and how it is beneficial for earth?
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16. Write the chemical formulae of (i) Copper pyrite (ii) Haematite (iii) Bauxite
17. Define: (i) Homologous series (ii) Functional group (iii) Isomerism
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18. What is soap? Write.names of four kinds of soap.
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19. What is the suspension? Write names of four examples of suspension in daily life.
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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.
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(b) Write two causes of food-spoilage and describe two methods of its preservation.
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(c) Write four differences between ordinary water and heavy water.
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24.(a) What are Oxides? Describe the types of normal oxides with one example of each.
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(b) Describe the extraction of Iron from its Hematite ore in the Blast Furnace. Also, write equation chemical reaction. (Diagram is not required)
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(c) Write four uses of Sulphuric acid.
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25. (a) Describe the laboratory method for the preparation of Chlorine gas with a balanced chemical equation and draw labelled diagram also.
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(b) Write four general properties of transition elements.
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(c) Define salts and describe three types of salts with examples.
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