Group 1 
Chemistry
Time: 2:40 Hours 
                                           Section I 

2-Write short answers of any eight parts from the following

  1. d and f-block elements are called transition elements. Give reasons (from chapter 1 exercise Q14 (a) 
  2. Alkali metals give ionic hydrates. Give reasons. (from chapter 1 exercise Q14(g)
  3. Why is 2% gypsum added in cement?(from chapter 2 exercise Q11 (d)
  4. Why is lime added to acidic soil? (from chapter 2 topic 2.6 (a))
  5. Why CO2 is acidic in character? (from chapter 3 exercise Q10 (b)
  6. What is the action of aqueous solution of Borax on litmus? (from chapter 3 exercise Q4)
  7. How does aqua regia dissolve gold and platinum? (from chapter 4 exercise Q4 (ii)
  8. Why is SO3 dissolved in H2SO4 and not in water? (from chapter 4 exercise Q7 (b)
  9. Why does damaged tin plated iron get rusted quickly? (from chapter 6 exercise Q8 (a)
  10. How chromate ions are converted into dichromate ions? (from chapter 6 exercise Q9)
  11. Define Cement. Give its raw material (from chapter 15 topic 15.5.2)
  12. Define micronutrients. Also give example. (from chapter 15 topic 15.3.1)
3. Write short answers of any 8 parts from the following

  1. What is iodized salt? (from chapter 5 exercise Q13(i)
  2. What is Teflon? Give two uses of Teflon (from chapter 5 Q13 (ii)
  3. Define Octane number. How octane number can be improved? (from chapter 7 topic 7.6 line 4)
  4. Define Heterocyclic compounds. Give two examples. (from chapter 7 topic 7.7(b)
  5. Why are the Alkanes called paraffins? (from chapter 8 topic 8.3.3)
  6. What is Hydrogenolysis? Give one reaction? (from chapter 8 topic 8.3.1 (2)
  7. Describe un reactivity of alkanes on the basis of inertness of sigma bond. (from chapter 8 topic 8.3.3 para 3)
  8. Write down the formation of tetra methyl lead and tetra ethyl lead from alkyl halide.
  9. Write down the reaction of ethyl magnesium bromide with CO2 ? (chapter 10 exercise Q5)
  10. Define the term Saponification with an example. (chapter 14 topic 14.6.13 (2)
  11. What do you mean by denaturation of proteins? (chapter 14 topic 14.6.6)
  12. What is difference between Glucose and Fructose? Give their open structures also. (chapter 14 exercise Q8 (a)

4. Write short answers of any six parts from the following.

  1. Convert benzene into o-nitrotoluene into two steps. 
  2. What happens when benzene is burnt in free supply of air?( from chapter 9 exercise Q5(d)
  3. Ethanol has higher boiling point than diethyl ether. Explain (from chapter 11 exercise Q11 (ii)
  4. Write structure formulas of two polyhydric alcohols. (from chapter 11 topic 11.5.6)
  5. Convert acetaldehyde to Lactic acid. 
  6. What are fatty acids? give two examples. (chapter 13 exercise Q7 (a)
  7. Explain acidic and basic character of amino acids. (chapter 13 exercise Q12)
  8. What are primary pollutants? Give two examples (chapter 16 topic 16.2.1)
  9. CO is a highly poisonous gas. Justify it.( chapter 16 topic 16.2.1 (1)(b) para 3rd
                                         Section-II

NOTE: Answer any three questions from the following

5.(a) What improvements were made in the Mendeleev's periodic table?
  (b) Write down the eight uses of Aluminium.
6.(a) Describe the commercial preparation of sodium hydroxide by diaphragm cell?
  (b) Prepare KMnO4 by Stadeler's process and electrolytic oxidation process.
7.(a) Write a note on 
  (i)  Alicyclic and heterocyclic compounds 
  (ii) Metamerism and tautomerism.
  (b) Define alkyl Halide. How they can be prepared from alcohol by different three       reactions?
8. (a) Write various methods of preparation of Alkynes (any four)
    (b)  Explain Cannizaro's reaction with mechanism.
9.  (a)  Describe two industrial and two laboratory methods for preparation of Benzene.
     (b)  Explain preparation of phenol by two methods