Chemistry:XII-Mock Test for Board Exams

1.The electric resistance of a column of 0.05M NaOH soln of diameter 1cm & length 50 cm is 5.55X103 ohm.Calculate its ٨m                     2. Calculate eqm constant for the Rxn –           4Br + O2 + 4H+ = 2Br2  +2H2O , E0cell = 0.16V 

3.  Which type of solids show following   (1)both Sckottky & Frankel defect. (2) Ferrimagnetism   (3)piezoelectricity  (4)  Ferroelectricity       

4. Why ZnO looks yellow on heating ?                    

5. Give electro chemical theory of corrosion?                       

6. 0.01 molol aqueous solution of K3[Fe(CN)6] freezes at –0.062oC. What  is the apparent percentage of dissociation (kf  water =1.86 )               

7. Analysis  shows  that nickel  oxide has formula Ni0.98O1.00. What  fractions of the nickel exist as Ni2+ and Ni3+ ions?    

8. Why  we add salt to the snow on the roads?

9.The half life period of a first  order reaction is 600 s . What percent  of A  remain after 30 min.?     

10. The activation energy of a 1st order reaction at 300 K is 60 KJ/mol.  In the presence of catalyst the  ,activation energy lowered to 50 KJ/mol at 300K. How many times  the reaction gets change in the   presence of catalyst at same temperature?   

11. Conductivity  of 0.00241 M acetic acid is 7.896 x 10-5  S cm-1 .  Calculate its  molar conductivity   and ifΛo  

   for acetic acid  is 390 .5  S cm2 mol-1 , what  is its  dissociation constant ?  

12. Of the d4 species, Cr+2 is strongly reducing  while Mn +3 is   strongly oxidizing. Explain ? 

13. Write a short note on Lanthanide contraction. Also give consequences ?

14. What is misch metal ?

15. Name two transition element showing only one oxidation state ?

16. Give 2o structure of DNA.                                                                

17. Define – (a) Mutarotatio (b) Zwitter ion (c) gene (d) codon             

18. Prepare Nylon – 6 from cyclohexane.                                             

19. What are the monomers of –       (a) PMMA (b) Buna – N (c) PAN (d) natureal rubber                        

20. Why cane sugar is non reducing ? explain .                                    

21. Give the method for the synthesis of  Phenol formaldehyde resine.  

22. Explain following  –   1.[Sc(H2O)6]+3    is colorless  &  [Ti(H2O)6]+3  is colored.     2.[Ni(H2O )4]3 is coloured & 

     [Ni(CN)4]3 is colourless.

23.Account  for the following : [Cr(NH3)6]3+ is   paramagnetic  and  octahedral whereas [Ni(CN)4]2- is diamagnetic and  square planer .

24. Write  IUPAC Name of  a. [Co(NH3)5ONO]Cl2    b. K3[Cr(CN)6]                                                                                    

25. Arrange the following in the order of oxidising strength –   ClO4 , BrO4  & IO3

26. Arrange the following in the order of acidic  strength –  (a) HClO , HClO2 , HClO3, HClO4

                                                                                              (b) HI , HBr . HCl                                             

27.Complete the following eqn –    (a) BrO3 + F2 + OH                     (b) Ca3P2 + H2O                  

28. Give the structure of XeOF2 .

29. Give distinguishing test b/n following –  (a) HCOOH  & Acitic acid  (b) Aniline & phenol 

                                                                  (c) CH3NH2  &CH3CH2NH2

30. What happen when acetamide is treated with NaOBr ?

31. Write a short  note on (a) Rosenmund reaction   (b) Aldolcondensation 

32. Why MnO4 is coloured ?

33.  An element has d of 19.35  gm/c.c. and length  of side of unit cell   is 316 pm. The unit  cell is b.c.c. How 

      many atoms 

     of element does 50 gm of element  contain ?                  

34. Which of the following is more acidic – (a) Acetic acid & Benzoic acid  (b)CH3OH & ethanol (c) Phenol & Benzoic Acid

35. Explain the basic character of 10 , 20 , 30 – ethyl amine is more  basic & why?

36. How can we convert  following –  (a) Nitro ethane to acetic acid   (b) Acetone to tert. butylalcohol

37. “ Ranitidine  is an anta acid “. Comment on the statement.

38. What is soap chemically ? Why does it not give sufficient lather with hard water ?

39. What is the function of  “equanil “. Give example of broad   spectrum? 

40.  What  is the disease caused by deficiency of following vitamins – Vit. A , H , K , B12

41. What is meant by hormones ?  What are peptide harmones & their   types ?

42. What are biopolymer. Give example?

43. Write short note on – (a) Van-de-arkel method  (b) Aluminothermy (b) Illingham diagram

                                                                 Or

      Give the various steps involve in the extraction of Fe from hematite ore ?

 

 

 

 

 

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