Tiêu đề Integrated Series 9th Class Chemistry- Solutions .pdf ✅

Class 9 Chemistry Table of Content 1. Matter In Our Surroundings 1 – 5 2. Is Matter Around Us Pure? 6 – 14 3. Structure Of the Atom 15 – 31 4. Atoms And Molecules 32 – 39 5. The Periodic Table 40 – 46 6. Chemical Bonding 47 – 56 7. IA Group Elements 57 – 72


Class 9 – Chemistry | I – 9 Matter in Our Surroundings 2 10. Correct option: (B) Gas Gases do not have definite shape and definite volume. The forces of attraction between the particles is very low (negligible) due to which particles move freely and rate of diffusion is high. 11. Correct option: (C) Gas As gases have negligible forces of attraction, so the particles move freely and rate of diffusion is high. So, gases can move freely in all directions. 12. Correct option: (C) liquids can be slightly compressed Liquids do not have a definite shape but have definite volume. They take the shape of the container in which they are stored and have intermolecular forces weaker as compared to solid but stronger when compared with gases. Due to weak intermolecular forces, they can be slightly compressed. 13. Correct option: (A) Solids Solids have definite shape and volume so they can be stored without a vessel but liquids and gases need a vessel to store them. 14. Correct option: (D) Both A and B The existence of matter in different states depends on temperature and pressure. Effect of pressure: On applying of pressure on gases, it changes to liquids and on applying pressure on liquids, it changes to solids. Effect of temperature: The effect of temperature on different states of matter in shown in figure below. 15. Correct option: (C) Gas Gases do not have definite shape and definite volume. The forces of attraction between the particles is very low (negligible) due to which particles move freely and rate of diffusion is high. 16. Correct option: (D) No change in volume As liquids have space between particles, so when sugar is added to the solution, the sugar particles occupy the space between the water particles and no change of volume occurs.