Page 1 of 8 AGA KHAN UNIVERSITY EXAMINATION BOARD SECONDARY SCHOOL CERTIFICATE CLASS IX EXAMINATION MAY Chemistry Paper I
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1 Page 1 of 8 AGA KHAN UNIVERSITY EXAMINATION BOARD SECONDARY SCHOOL CERTIFICATE CLASS IX EXAMINATION MAY 2012 Chemistry Paper I Time allowed: 35 minutes Marks 25 INSTRUCTIONS 1. Read each question carefully. 2. Answer the questions on the separate answer sheet provided. DO NOT write your answers on the question paper. 3. There are 100 answer numbers on the answer sheet. Use answer numbers 1 to 25 only. 4. In each question there are four choices A, B, C, D. Choose ONE. On the answer grid black out the circle for your choice with a pencil as shown below. Candidate s Signature 5. If you want to change your answer, ERASE the first answer completely with a rubber, before blacking out a new circle. 6. DO NOT write anything in the answer grid. The computer only records what is in the circles. 7. You may use a simple calculator if you wish.
2 Page 2 of 8 1. A student has to identify the element, mixture and compound in the given substances. i. Mercury ii. Glucose iii. Ammonia iv. Brass Which of the following arrangements is correct for the given substances? i ii iii iv A. Element Compound Mixture Element B. Element Compound Compound Mixture C. Compound Element Mixture Compound D. Compound Mixture Mixture Element 2. Which of the following represents the formula mass of ammonium ion? A. 15 B. 16 C. 17 D Which type of chemical reaction occurs when zinc metal reacts with dilute sulphuric acid? A. Addition reaction B. Displacement reaction C. Decomposition reaction D. Double displacement reaction 4. All of the following conclusions are drawn by Rutherford on the experiment of scattering alpha particles EXCEPT that A. the space inside the atom is hollow. B. the central part of atom is positively charged. C. the electrons are distributed in space around nucleus. D. the electrons jump to higher energy level by absorbing energy. 5. If an atom has 17 electrons, then its outermost shell will be A. K. B. L. C. M. D. N. 6. Which of the following elements represents the electronic structure of the ion shown in the given diagram? A. Lithium B. Sodium p n e C. Calcium D. Potassium Electronic Structure of an ion X +1
3 Page 3 of 8 7. Which of the following characteristics is/are correct for an isotope? I. Similar electronic structures II. Similar chemical properties III. Similar mass number A. I only B. I and II only C. II only D. II and III only 8. Which of the following elements has the largest atomic radius? A. Cs B. Li C. Fr D. Rb 9. The elements having 3 shells and5e A. II A. B. III A. C. IV A. D. V A. in their outermost shell belong to group 10. All of the following periodic trends increase as we move from left to right in a period, EXCEPT A. atomic radii. B. electronegativity. C. electron affinity. D. ionization energy. 11. Which of the following types of bond is formed when a metal reacts with a non-metal? A. Ionic B. Metallic C. Covalent D. Coordinate covalent 12. Which type of covalent bonding is formed when two atoms of nitrogen react with each other? A. Single B. Double C. Triple D. Coordinate PLEASE TURN OVER THE PAGE
4 Page 4 of In the given reaction, H + acts as a/an A. neutral species. B. acceptor. C. carrier. D. donor. 14. The diagram given below represents the movement and distribution of particles in different states of matter. Which of the following arrangements is correct for the given diagram? I II III A. Solid Liquid Gas B. Liquid Solid Gas C. Solid Gas Liquid D. Liquid Gas Solid 15. Which of the following processes involves the increase of kinetic energy of molecules of a liquid by heating? A. Condensation B. Evaporation C. Sublimation D. Melting 16. Which of the following is an example of diffusion? A. Bubbles rising in a beaker of boiling water B. Fragrance of flowers in a garden C. Swelling of raisins in water D. Steam condensing on a cold window 17. A teaspoon of coffee granules dissolves when mixed in a cup of hot water. This process produces a coffee solution. The original granules are classified as a A. product. B. reactant. C. solvent. D. solute.
5 Page 5 of Which of these action(s) will cause more sugar to dissolve in a saturated solution? I. Add more sugar while stirring. II. Heat the solution while adding more sugar. III. Grind the sugar to a powder; then add while stirring. A. II only B. I and II only C. III only D. II and III only 19. A teacher prepared M sodium chloride stock solution. What volume of the stock solution is required to prepare a dilution of 0.05 M in 100 ml? A. 100 ml B. 60 ml C. 40 ml D. 20 ml 20. Which of the following test tubes shows favourable conditions for corrosion? 21. A laboratory assistant arranges a set of solutions. Which of the following is an example of a strong electrolyte? PLEASE TURN OVER THE PAGE
6 Page 6 of Which of the following products is obtained in the given word equation? A. Metal ion B. Metal oxide C. Metal hydroxide D. Metal oxide + Hydrogen Metal + Oxygen? 23. Which of the following metals reacts explosively with dilute acids? A. Zinc B. Silver C. Copper D. Calcium 24. Which of the following metals does NOT occur in free state in nature? A. Copper B. Gold C. Silver D. Sodium 25. A student put some calcium tablets in a glass of water. He observed that the tablets sank and reacted vigorously with water. Which of the following products are formed in the above reaction? A. Ca(OH) 2 + H 2 B. Ca(OH) 2 + H 2 O C. CaO +H 2 D. CaO + H 2 O END OF PAPER
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