S.2 Corona Hol Chem Test Caltec S.2

1 CORONA HOLIDAY TEST S.2 CHEMISTRY TIME: 2 HOURS INSTRUCTION S - Attempt all questions - Answers must be put in the spaces provided. ANSWER GRID FOR SECTION A 1. 6. 11. 16. 2. 7. 12. 17. 3. 8. 13. 18. 4. 9. 14. 19. 5. 10. 15. 20. SECTION A 1. The product formed when a candle burns in excess air is; A. Carbon monoxide B. Methane C. Water vapour D. Soot 2. Which of the following pairs of gases do not cause atmospheric pollution? A. Sulphur dioxide and carbon dioxide B. Helium and hydrogen C. Nitrogen dioxide and sulphur dioxide D. Carbon monoxide and carbon dioxide 3. Which one of the following oxides has the most ionic structure? A. P2O2 B. SO2 C. Al2O3 D. Na 2O 4. The brown coating formed when iron nail is left in moist air for a long time is; A. hydrated iron (I) oxid e B. hydrated iron (III) oxide C. anhydrous iron (III) oxide D. anhydrous iron (II) oxide 5. When pollen grains are placed on the surface of water in a trough and observed under a microscope, the pollen grains will be seen to; 2 A. all move in one direction B. all sink to the bottom of the trough C. all remain stationary D. move in a random way. 6. Iron is usually galvanized or painted before use because this; A. reduces the coat B. makes the iron structure stronger C. makes iron malleable D. makes iron rust free 7. An element X has atomic number of 20. Which of the following statements is true about the element? A. It forms anion of formula X2- B. It will react with water to liberate hydrogen C. It is in group VI of the periodic table D. It is in period …