GVHSS OMANOOR FIRST TERMINAL EXAMINATION -SEPTEMBER 2022 CHEMISYRY SCORE : 30 TIME : 1 HOUR 1. Write down any two differences between crystalline solid and amorphous solid (2) 2. Draw Face centered cubic unit cell and calculate number of particles present in it (3) OR An element with body centeredbcubic structure has cell edge length 400pm. Calculate the density of the element. (Atomic mass of the element is 100) (3) 3. Sodium show yellow colour when it is heated in the atmosphere of sodium vapour. Why ? (2) 4. differentiate between conductor and insulator based on band theory. Explain with the help of diagram ? (2) 5. State Henry’s law and write down any one application (2) 6. What is mean by colligative properties . What are they ? (3) 7. What is the importance of reverse osmosis ? (2) 8. What is mean by corrosion ?. Write down any two methods used to prevent corrosion ? (2) 9. Kohlrausch’s law help to determine limiting molar conductivity of weak electrolyte. State the law siting example ? (2) OR Write ANY TWO differences between order and molecularity? 10. write down Arrenius equation and explain the terms ? (2) (2) 11. Half life period of first order reaction is 150 seconds. How long will take for onethird (1/3) reactionto be completed? (2) 12. when activated charcoal is added to a closed vessel containing mixture of gases, pressure of the gas was decreased. Identify the phenomenon behind this? (2) 13. Silica gel and anhydrous calcium chloride behave differently with water. Identity the difference ? (2) 14. what are the difference between chemisorption and physisorption (2)
