PSEB 12th Model Test Paper 2022 Chemistry Term 2

Class 12 ,Semester 2 Sample Paper Time : 1.5 hours M.M : 35 Part- A : one mark questions 1. How many number of atoms per unit cell are present in bcc structure ? 1 2. Which out of the two is more basic Ammonia or aniline? 1 3. Write chemical name of vitamin D. 1 4. Give any one example of a biopolymer. 1 5. Which type of drug is chloroquine 1 Part- B : Two marks questions 6. Give reason why trichloro acetic acid has more acidic character than monochloro acetic acid 2 7. A solid AB has NaCl structure. If the radius of cation (A⁺) is 170 pm, calculate the maximum possible value of the radius of anion (B⁻) 2 8. Discuss oxidation of secondary alcohols 2 9. Phenol has higher boiling point than toluene. Why ? 2 or What is williamson's synthesis. Give an example. 1+1=2 10. Discuss briefly Hell Volhard Zelinsky reaction. 2 11. Convert propanone to propene 2 12. List any two biological functions of Carbohydrates. 2 13. What are tranquilizers ? Give an example. 1+1=2

Part- C : Three marks questions 14. An element having density 11.2 g cm⁻ᶟ forms a fcc lattice with edge length of 4X10⁻⁸cm. Calculate the atomic mass of the element . 3 15. Describe Hinsberg’s test to distinguish between primary , secondary and tertiary amines. 3 or Write down : (i) Carbylamine reaction 1+1+1=3 (ii) Diazotisation reaction (iii) Mendius reduction 16. Write down polymerization reactions for the following Polymers: (i) Teflon (ii) Nylon- 66 (iii) Buna- s 1+1+1=3 17.(a) Write down following reactions (i) Finkelstein reaction (ii) Wurts fittig reaction (iii) Sandmeyer reaction 1+1+1=3 (b) The para isomer of dichlorobenzene has higher melting point than the ortho and meta isomers. Why ? 2 or (a) Why aryl halides are less reactive than alkyl halides ? 3 (b) Give any two differences between SN¹ and SN² reactions. 2