TS Inter 1st Year Model Paper 2021 Chemistry

TSBIE - MODEL PAPER CHEMISTRY - I Time: 3 Hours Max.Marks: 60 ___________________________________________________ Each Question Carries TWO marks. 2 x 10 = 20 SECTION - A 1. What is Lanthanide Contraction? Give one of its consequences. 2. Which of the two ions Ca 2+ or Zn2+ is more stable and why? 3. What is Boltzman’s constant? Give its value. 4. Calculate the weight of 0.1 mole of sodium carbonate. 5. What is homogenous equilibrium? Write two homogenous reactions. 6. Lithium salts are mostly hydrated. Why? 7. What happens when magnesium metal is burnt in air? 8. Diamond has high melting point – explain. 9. What is the effect of water on tin (Sn)? 10. Write the structure of a) Neopentane b) Trichloro ethanoic acid. SECTION - B Each Question Carries FOUR marks. 6 x 4 = 24 11. Explain the differences between emission and absorption spectrum. 12. Balance the following reaction by ion electron method.  H Cr2O72  SO32  Cr 3  SO42 13. Write the postulates of Kinetic Molecular theory of gases. 14. Derive Ideal gas equation. 15. Chemical analysis of a carbon compound gave the following percentage composition by weight of the elements present, carbon = 10.06%, hy- drogen = 0.84%, chlorine = 89.10%, Calculate the empirical formula of the compound. 16. State and explain Hess’s law of constant heat summation.

17. Derive the relation between Kp & Kc for the equilibrium reaction. N2 (g) + 3H2 (g) 2NH3 (g) 18. What is conjugate acid-base pair? Illustrate with example. 19. Discuss the Priniciple and the method of softening of hard water by synthetic, ion - exchange resins. 20. Write reactions to justify amphoteric nature of alminium. 21. What do you understand by a) Allotropy b) Inert pair effect c) Catenation. 22. Give two examples each for position and functional group isomerism. SECTION - C Each Question Carries EIGHT marks. 2 x 8 = 16 23. How are the quantum numbers n, l and m arrived at? Explain the sig- nificance of these quantum numbers. 24. Define IE1 and IE2. Why is IE2 > IE1 for an atom? Dicsuss 3 factors effecting IE of an element. 25. What do you understand by hybridisation. Explain different types of hybridisation involving s and p orbitals. 26. Give 2 methods of preparation of Acetylene. How does it react with water and Hydrogen bromide.