12th chemistry important model question paper

Mar 7 • Board Sample Papers • 112975 Views • 250 Comments on 12th chemistry important model question paper

Chemistry important model question paper

Class 12th is most important period of career and chemistry is considered as one of toughest subject of class 12th especially for students who are good in physics. Here we have tried to get you more practiced for class 12th chemistry and so we have brought  before you 12th chemistry important model question paper

12th chemistry important  model question paper


12th Chemistry Questions Answers

12th Chemistry Important Model Question Paper

Choose and write the correct answer:

1. Which of the following particles having same kinetic energy would have the maximum debroglie wavelength?

a) Proton          b) neutron          c) α – particle     d) β – particle

2. Intra – molecular hydrogen bonding is present in

a) HF                   b) O – Nitro phenol         c) ethanol            d) tri bromo phenol

3. If XA – XB = 0 the bond is

a) Non polar covalent      b) polar covalent   c) ionic bond    d) co – ordinate covalent

4. The compound with garlic odour is

a) P4O6               b) P2O5      c) H3PO3         d) PH

5. The ion with maximum number of unpaired electrons is

a) Mg2+            b) Ti3+         c) V3+            d) Fe2+

6. The correct electronic configuration of copper atom is

a) 3d104sf      b) 3d104s2    c) 3d94s2    d) 3d54s24p4

7. Maximum oxidation state exhibited by lanthanide is

a) +1             b) +2             c) +3           d) +4

8. The isotope used as a power source in long mission space probes is

a) U235        b) Pu235      c) Pu238    d) U238

9. An example of chelating ligand is

a) Chloro      b) bromo      c) en          d) NO2

10. Which of the following is used as neutron absorber in the nuclear reactor?

a) Water        b) deuterium        c) uranium     d) cadmium

11. An ion leaves its regular site and occupies a position in the space between the lattice sites.

a) Schottky defect    b) Frenkel defect     c) Vacancy defect     d) Impurity defect

12. Change in Gibbs free energy is given by

a) ΔG=ΔH+TΔS      b) ΔG=ΔH-TΔS      c) ΔG=ΔH×TΔS      d) ΔG=ΔE+PΔV

13. If ΔS for a reaction is negative, the change is

a) spontaneous      b) reversible     c) non spontaneous     d) equilibrium

14. In the reversible reaction 2H2O(g)+2Cl2(g) → 4HCl(g)+O2(g),Kp is

a) greater than Kc     b) less than Kc     c) equal to Kc        d) zero

15. In the equilibrium N2(g)+3H2(g) → 2NH3(g) the maximum yield of ammonia will obtained with  the process having

a) low p high T        b) high p low T      c) high T high P     d) low T low P

16. Arrhenius equation is

 a) K=Aae-1/RT         b) K=AeRT/Ea        c) K=Ae-Ea/RT      d) K=AeEa/RT

17. Smoke is a colloidal solution of

a) gas in liquid         b) liquid in gas     c) gas in solid     d) solid in gas

18. An emulsion is a colloidal solution of

 a) two solids      b) two liquids      c) two gases      d) one solid one gas

19. Bergius process for the synthesis of petrol from coal the catalyst used is

a) Fe2O3            b) CuCl2            c) V2O5                d) NO

20. Oswalds dilution law is applicable in the case of the solution of

a) CH3COOH   b) NaCl              c) NaOH              d) H2SO4

21. oxidation of glycerol with bismuth nitrate gives

a) meso oxalic    b) glyceric    c) tartronic acid     d) both b and c

22. Oxygen atom of ether is

 a) very  active    b) inert        c) oxidizing      d) replaceable

23. Anisole is used in

a) perfumes       b) ananesthetic      c) antiseptic    d) solvent

24. Hydrogeneration of benzoyl chloride in the presence of Pd and BaSO4 gives

a) phenol            b) benzoic acid        c) benzyl alcohol     d) benzaldehyde

25. Weakest acid among the following compounds

a) CH3COCH        b) C6H5OH           c) H2O       d) C2H2

26. Bromo ethane reacts with silver nitrite to give

a) C6H5NO2         b) C2H5-O-NO       c) C2H5Br    d) C2H5NC

27. Which one is known as oil of mirbane?

a) nitro methane     b) nitro ethane    c) nitro benzene       d) methyl amine

28. The order of boiling  point in amines depending upon strength of hydrogen bond is

a) 1°>2°>3°     b) 3°>2°>1°     c) 2°>°1>3°      d) 2°>3°>1°

29. The building block of proteins are

a) α – hydroxyl acids  b) α – amino acids    c) β – hydroxyl acids    d) β – amino acids

30. The reducing sugar is

a) sucrose      b) cellulose    c) starch    d) glucose

Answer any 15 Question

31. Distinguish between particle and wave.

32. If C-Cl bond distance is 1.76 A° and atomic radius of chlorine is 0.99 A°, calculate the atomic radius of   Carbon.

33. Write a note on plumbo solvency?

34. Why transition elements from complexes?

36. A substance is found to have a magnetic moment of 3.9 BM. How many unpaired electrons does it Contain?

37. What are four decay series?

38. Calculate the number CsCl units per unit cell?

39. What is entropy?  What are the units of entropy?

40. Define – Reaction quotient ‘Q’.

41. What is activation energy?

42. What are simple and complex reactions?

43. What is heterogeneous catalyst? Give example?

44. The mass of the substance deposited by the passage of 10 ampere of current for 2 hrs 40 mins and 50 seconds is 9.65g. Calculate the electrochemical equivalent.

45. What are the conditions for a compound to be optically active?

46. How is allyl alcohol obtained from glycerol?

47. Phenol is insoluble in NaHCO3 solution but CHCOOH is soluble. Give reason.

48. Write a note on Rosenmund Reduction?

50. Write carbylamines reaction.

51. What are anesthetics? Give example.


Answer any seven questions choosing at least two question from each section 7×5 = 35
Section – A

52. Derive de-Broglie’s equation. What is its significance?

53. Explain how potassium dichromate is extracted from chromite ore.

54. Bring out the consequences of lanthanide contraction.

55. Write the postulates of werner’s theory.

Section – B

56. State various statements of second law of thermodynamics.

57. State Le chartlier’s principle. How this principle used for the formation of NH3

58. Write notes on

      (i) consecutive reaction      (ii) parallel reaction      (iii) opposing reaction

59. The emf of the half cell Cu2+(aq)/Cu(s) containing 0.01 M Cu2+ solution is +0.301 V Calculate the standard emf of the half cell.

Section – C

60. Distinguish between aromatic and aliphatic ethers.

61. Discuss the mechanism of aldol condensation.

62. How are the following conversation carried out?

       (i) Salicylic                               Aspirin

       (ii) Lactic acid                             Lactide

63. Explain briefly characteristics of rocket propellants?

Question No. 70 compulsory and answer any three from the remaining questions. 4×10=40

64. a) Explain the various factors that affect ionisation  energy.

      (b) Mention the uses of silicones.

65. (a) In what way [FeF6]4-

        (b) Explain radio carbon dating

66. (a) Explain the nature of glass.

        (b) Write briefly about the preparation of colloids by chemical methods.

67. (a) Derive Henderson equation

       (b) How emf of a cell is determined?

68. (a) Describe the conformation of cyclo hexanol comment on their stability.

       (b) Give the mechanism involved in the satisfaction of a carboxylic acid with alcohol.

69. (a) Write note on i) Mustard oil reaction (ii) coupling reaction (iii) schiff’s base formation

       (b) How is the structure determined?


a) An organic compound ‘A’ (C2H6O) reacts with metallic sodium liberates hydrogen gas and also gives red color in victor Mayer test. On oxidation with K2Cr2O7 ‘A’ gives the compound ‘B’. ‘B’ also undergoes aldol condensation . Further oxidation of ‘B’ gives compound ‘C’ compound ‘A’&’C’ reacts in the presence of H2SO4 it gives compound ‘D’ compound ‘D’ is fruity odour in nature. Identify compound A,B,C, and D. Explain the reactions.

b) ‘A’ sulphate compound of group 11. This compound is also called as Blue vitriol. The compound undergoes decomposition at various temperature

         A       →                 B           →            C              →            D

         Identify the compounds A,B,C and D.

c) An organic compound ‘A’ (C6H6O) gives maximum of two isomers B & C. When alkaline solution of A is refluxed with chloroform at 333K. B on oxidation gives an acid ‘D’. The acid D is also obtained by treating sodium salt of ‘A’ with CO2 under pressure. Identify A, B, C & D and explains the reactions.

d) The equivalent conductance at infinite dilution of HCl, CH3COONa, and NaCl are 426.16, 91.0 and 126.45 ohm-1 cm2 (gm.Equivalent)-1 respectively. Calculate the λa of acetic acid.

You can download the paper from the link given below:
Chemistry important model question paper_2013_09_11_13_24_01_080

If you find the question paper helpful please comment for suggestion.

250 Responses to 12th chemistry important model question paper

  1. D.V.S.Yaswanth says:

    1st year

  2. D.V.S.Yaswanth says:

    1st year

  3. D.V.S.Yaswanth says:

    1st year

  4. harshan says:

    searching for question papers

  5. harshan says:

    searching for question papers

  6. harshan says:
  7. harshan says:
  8. nilesh kanel says:


  9. nilesh kanel says:
  10. nilesh kanel says:
  11. sanika anoop says:
  12. prasad mandelwad says:

    hsc 12th sci gerneral group

  13. Vitthal says:

    Halogenation reaction

  14. Vitthal says:
  15. Vitthal says:
  16. maruthupaandi says:


  17. maruthupaandi says:


  18. maruthupaandi says:
  19. aravindharaj.s says:
  20. deepusharma says:


  21. deepusharma says:
  22. deepusharma says:
  23. zahidul islam says:

    i need chemsitry model question

  24. kapile s r says:

    sample question paper 12th science board exam paper

  25. kapile s r says:

    sample question paper 12th science board exam paper

  26. lakshdeep kaur says:


  27. sakthimurugeswari says:


  28. sakthimurugeswari says:
  29. vinay says:

    2kd puc

  30. vinay says:

    2kd puc

  31. vinay says:

    2kd puc

  32. vinay says:

    2kd puc

  33. vinay says:

    2kd puc

  34. Anonymous says:
  35. Rahul sahu says:
  36. Anonymous says:
  37. koduruchinna says:
  38. Anonymous says:

    b com

  39. Anonymous says:
  40. Parmanand yadav says:

    Chamestry / physices/biologyprepration

  41. Parmanand yadav says:
  42. Anonymous says:
  43. PRAJITHA P says:
  44. Sagar Das says:

    Chemistry p and Aldihide kiton Carboxolicacid

  45. Sagar Das says:
  46. sahil khichar says:

    Chemistry reaction

  47. Sasi karan perumal says:

    12th studying

  48. Anonymous says:
  49. Vivek Patel says:
  50. Anonymous says:
  51. Anonymous says:
  52. Vasanth says:

    Chemistry model question papers

  53. Pawan Yadav says:


  54. s ahil makandar says:

    Chemistry important question paper

  55. sabir patel says:

    Chemistry model answer paper

  56. sabir patel says:

    Chemistry model answer paper

  57. sabir patel says:

    Chemistry model answer paper

  58. sabir patel says:

    Chemistry model answer paper

  59. sabir patel says:

    Chemistry model answer paper

  60. SURENDRA says:


  61. Anonymous says:
  62. Anonymous says:
  63. Anonymous says:
  64. Anonymous says:
  65. Nilesh says:

    Model question pape

  66. bablu kumar says:
  67. bablu kumar says:
  68. bablu kumar says:
  69. bablu kumar says:
  70. bablu kumar says:
  71. bablu kumar says:
  72. bablu kumar says:
  73. bablu kumar says:
  74. bablu kumar says:
  75. bablu kumar says:
  76. bablu kumar says:
  77. Ramya says:

    Enter your any educational query or doubt organic chemistry

  78. milind bhimrao kamble says:

    chemistry solution papers

  79. Bishal Kalita says:


  80. Anonymous says:
  81. puneet kumar says:

    12th chemistry

  82. Faizan khan says:
  83. Tayyaba Imran says:

    organic chemistry important questions

  84. Anonymous says:
  85. hooriya says:

    paper pattern

  86. hooriya says:

    paper pattern

  87. hooriya says:
  88. Mohammed ashish says:
  89. Anonymous says:
  90. Kaviya says:


  91. Kaviya says:


  92. Kaviya says:


  93. Kaviya says:
  94. Rajan says:
  95. Rajan says:
  96. Rajan says:
  97. Rajan says:
  98. Anonymous says:
  99. Anonymous says:
  100. Raghunath kumar says:
  101. Raghunath kumar says:
  102. Raghunath kumar says:
  103. Anonymous says:
  104. sahana shettar says:


  105. sahana shettar says:


  106. sahana shettar says:


  107. sahana shettar says:


  108. sahana shettar says:


  109. sahana shettar says:


  110. sahana shettar says:


  111. sahana shettar says:


  112. sahana shettar says:


  113. sahana shettar says:


  114. sahana shettar says:


  115. sahana shettar says:


  116. sahana shettar says:


  117. sahana shettar says:
  118. Arshad says:


  119. Arshad says:


  120. Arshad says:
  121. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  122. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  123. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  124. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  125. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  126. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  127. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  128. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  129. shreyas s says:

    can u send marks allotation for chapters in 2nd puc

  130. Anonymous says:
  131. chinmay says:
  132. Kanakappa says:

    Pic 2nd year

  133. Anonymous says:
  134. Anonymous says:
  135. sajithraj.R says:

    How to get centum in physics

  136. sajithraj.R says:

    How to get centum in physics

  137. sajithraj.R says:

    How to get centum in physics

  138. Saibu Pasha says:


  139. Keerthi keshva says:

    Chemistry model papers

  140. Keerthi keshva says:
  141. NahushNakhate says:


  142. Anonymous says:


  143. shubham sukhadeve says:

    class 12

  144. shubham sukhadeve says:

    class 12

  145. atul Sharma says:

    MHS Janta colony Jaipur

  146. atul Sharma says:

    MHS Janta colony Jaipur

  147. Anonymous says:
  148. Gavi uppar says:
  149. Gavi uppar says:
  150. Gavi uppar says:
  151. Gavi uppar says:
  152. Gavi uppar says:
  153. Gavi uppar says:
  154. Gavi uppar says:
  155. Gavi uppar says:
  156. Gavi uppar says:
  157. Gavi uppar says:
  158. Gavi uppar says:
  159. Gavi uppar says:
  160. Gavi uppar says:
  161. Anonymous says:
  162. Gavi uppar says:
  163. Gavi uppar says:
  164. Gavi uppar says:
  165. Gavi uppar says:
  166. Gavi uppar says:
  167. Gavi uppar says:
  168. Gavi uppar says:
  169. Gavi uppar says:
  170. Gavi uppar says:
  171. Gavi uppar says:
  172. Gavi uppar says:
  173. Gavi uppar says:
  174. Gavi uppar says:
  175. Gavi uppar says:
  176. Gavi uppar says:
  177. Gavi uppar says:
  178. Gavi uppar says:
  179. Gavi uppar says:
  180. Gavi uppar says:
  181. Gavi uppar says:
  182. Gavi uppar says:
  183. Gavi uppar says:
  184. Gavi uppar says:
  185. Gavi uppar says:
  186. Gavi uppar says:
  187. Gavi uppar says:
  188. Gavi uppar says:
  189. Gavi uppar says:
  190. Gavi uppar says:
  191. Gavi uppar says:
  192. Gavi uppar says:
  193. Gavi uppar says:
  194. Gavi uppar says:
  195. Gavi uppar says:
  196. Gavi uppar says:
  197. Gavi uppar says:
  198. Gavi uppar says:
  199. Gavi uppar says:
  200. Anonymous says:
  201. krishna says:

    12 chemistry

  202. janfirtho says:
  203. janfirtho says:
  204. Dinesh says:


  205. Dinesh says:


  206. Dinesh says:


  207. Dinesh says:


  208. Dinesh says:


  209. Dinesh says:
  210. bhushan mude says:

    Highly important questions

  211. bhushan mude says:

    Highly important questions

  212. ramkumar das says:

    Schools study

  213. ramkumar das says:

    Schools study

  214. ramkumar das says:
  215. renuka says:

    b.sc., maths

  216. renuka says:

    b.sc., maths

  217. renuka says:

    b.sc., maths

  218. renuka says:

    b.sc., maths

  219. renuka says:

    b.sc., maths

  220. renuka says:

    b.sc., maths

  221. Anonymous says:

    n c r t

  222. Anonymous says:
  223. akshada says:
  224. HARIOM says:
  225. HARIOM says:
  226. HARIOM says:
  227. HARIOM says:
  228. HARIOM says:
  229. manisha says:

    Chemistry important ques for ch solid state class12

  230. Anonymous says:
  231. ARCHANA SAHU says:


  232. ARCHANA SAHU says:


  233. Anonymous says:
  234. Aswini says:
  235. Aswini says:
  236. Anonymous says:


  237. Anonymous says:
  238. dhanraj says:

    Chemistry,physics,maths important question and sums

  239. AJITH M says:


  240. saurav kumar says:

    i am n ot ablt to leaern prodic tabll i always forgot

  241. M.Syed Oli says:

    physics ten mark diagramatic question must be in like book or in my own words

  242. love preet singh says:

    please give me chemistry and physics question and answer

  243. velavan p says:

    in electrochemistry 1 buffer action of acidic buffer and basic buffer concept is different when compared tamil medium and english medium book. which is correct.

  244. baranitharan says:

    important 10 marks in zoology and 1 mark in all subjects

  245. baranitharan says:

    +2 biology zoology 5,6th lesson 10 marks
    physics problems

  246. asarudheen says:

    physics get 200 marks so I take the study type and study questions time management

  247. VIVEKANANDAN says:

    TO SCHORE CENTUM IN MATHS CHEMISTRY PHYSICS what material or notes I can choose

  248. chaitanya birajdar says:

    hsc board chemistry important quetions with anwser

  249. s.mega says:

    i want to attend physics compulsary 5m problem .which lessons i can select

  250. sanobar khan says:

    i m in 12th sci i want time table how to study now??

« »