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Sample Paper of Chemistry 2014 for class 12, CBSE. Paper No.2

  
        
          

SAMPLE PAPER – 2014

CLASS – XII

SUBJECT – Chemistry

General instructions:

1All questions are compulsory.

2Marks for each question are indicated against it.

3Questions number 1to 8 are very short –answer questions, carrying 1 mark each. Answer these in one word or about one sentence each.

4Questions number 9 to18 are short –answer questions, carrying 2 marks each. Answer these in about 30 words each.

5Questions number19 to27 are short –answer questions, carrying 3 marks each. Answer these in about 40 words each.

6Questions number28 to30 are long-answer questions of 5 marks each. Answer these in about 70 words each.

  7 Use log tables, if necessary. Use of calculators is not permitted

CHEMISTRY  BLUE PRINT CLASS XII

S.NO CHAPTER S.A(1) S.A(2) S.A(3) L.A(5) TOTAL
1 HALOALKANES AND HALOARENES NIL 1X(2) 1X(3) NIL 5
2 ALCOHOLS, PHENOLS AND ETHERS NIL 1X(2) 1X(3) NIL 5
3 ALDEHYDES, KETONES… NIL NIL NIL 1X(5) 5
4 AMINES 1X(1) 2X(2) NIL NIL 5
5 COORDINATION COMPOUNDS NIL 1X(2) 1X(3) NIL 5
6 SURFACE CHEMISTRY NIL 1X(2) 1X(3) NIL 5
7 ISOLATION OF ELEMENTS 2X(1) NIL 1X(3) NIL 5
8 POLYMERS 2X(1) NIL 1X(3) NIL 5
9 BIOMOLECULES NIL NIL NIL 1X(5) 5
10 SOLUTIONS 1X(1) 2X(2) NIL NIL 5
11 ELECTROCHEMISTRY NIL NIL NIL 1X(5) 5
12 CHEMICAL KINETICS NIL 1X(2) 1X(3) NIL 5
13 SOLID STATE NIL 1X(2) 1X(3) NIL 5
14 CHEMISTRY IN EVERYDAY LIFE 2X(1) NIL 1X(3) NIL 5
    8 20 27 15 70

 

1.Write Hofmann-Bromamide reaction.(1)

2.What are depressants? Give example.(1)

3.Name the process used for refining of (i) Nickel.(1)

  1. Define addition polymers with two examples . (1)
  1. Write the structure of monomer of BunaN.(1)
  1. People living at high altitude generally suffer from anoxia , Explain.(1)
  1. How is the drug Cimetidine found to be more effective in controlling acidity?(1)
  1. Which type of drugs form essential component of sleeping pills?(1)
  1. C4H8Cl2 (A) on hydrolysis forms C4H8O (B) which forms an oxime, but does not reduce Fehling solution. B also gives iodoform test. Identify A and B and explain reactions.(2)
  2. Ortho and para nitro phenols are more acidic than phenols whereas cresols are less acidic than phenols.Explain why? (2)

 

Give reasons:

  • Why are amines basic in nature?
  • Ethylamine is more basic than aniline. (1+1)

12 Give IUPAC name of the following.

chemistery pic2

13 A group 14 element is to be converted into n –type semi conductor by doping it with suitable impurity .To which group should this impurity belong? What is this type of defect called?    (2)

 

14 (a) Write linkage isomer of [Co (NH3)5  NO2 ] Cl 2

 

(b)Explain the splitting of  d-orbital in a octahedral complex?      (2)

 

15 In a process adsorbate and adsorbent are held by strong force like a chemical bond. Name the type of adsorption? Write other two characteristics of such type of adsorption. (2)

 

16State Raoult’s law for solution containing Volatile and non-volatile solute.(2)

 

17 i) Out of 1M solution of Sugar and 1 M solution of Urea, which will have greater boiling point? Why.

(ii)What is reverse osmosis? Give its application.(2)

 

  • A greater insight in to the energetic and mechanistic aspects of reactions”. Explain the above statement which was given by “Max Trautz” and William Lewis” (2)
  • (i) C4H8Cl2 (A) on hydrolysis forms C4H8O (B) which forms an oxime, but does not reduce Fehling solution. B also gives iodoform test. Identify A and B and explain reactions.

(ii)Convert benzyl chloride to benzyl alcohol.(2+1)

  • Carry out the following conversions:
  • Ethanol to 2 propanol
  • Acetaldehyde in to 2- butenol
  • Acetone to 2 butyl alcohol    (3)

 

 

21 Write IUPAC names of the following:

  • K3 [Fe (C2O4)3]
  • [PtCl (NH3)5] Cl3.
  • [Pt Cl (NH2CH3) (NH3)2] Cl.   (3)

 

 

22 Account for the following:

(i)Fe(OH)sol is positively charged

(ii) The extent of physical adsorption decreases with rise in temperature

(iii) A delta is formed at appoint where river enters the sea.  (3)

 

23 Following method of extracting Zn is based on thermodynamics:

(a) 2ZnS + 3O2               2ZnO + 2SO2

(b) ZnO +C               Zn + CO

ΔG0f( in kJ mol-1) for   ZnS=-205.4       ZnO=-318.2     SO2=-300.4             CO=-137.3

Calculate free energy changes of the above reactions and comment on the result.   (3)

 

24 Explain mechanism of free radical polymerization.  (3)

 

25 On heating, arsine(AsH3) decomposes as:                                     2AsH3(g)®2As(s) +3H2

The total pressure measured at constant temperature and constant volume varies with time as follows: Calculate the rate constant assuming the reaction to follow the first order rate law.  (3)

t(min) 0 5 7.5 10
p/mmHg 760 836 866.4 896.8

26 The unit cell of aluminium is a cube with an edge length of 405pm. The density of aluminium is 2.70 g/cm3. What type of unit cell of aluminium is?   (3)

27(i) What are artificial sweetening agents?

(ii) Name the sweetening agent used in the preparation of sweets for a diabetic patient.

(iii) What problem arises in using alitame as artificial sweetener?       (3)

28  An organic compound (A) having molecular formula C9H10O forms an orange red precipitate (B) with , 2,4-DNP reagent. Compound (A) gives a yellow precipitate (C) when heated in the presence of iodine and NaOH along with a colourless compound (D). (A) does not reduce Tollen’s reagent or Fehling’s solution nor does it decolourises bromine water. On drastic oxidation of (A) with chromic acid, a carboxylic acid (E) of molecular formula (C7H6O2) is formed. Deduce the structures of the organic compounds (A) to (E).     (5)

OR

Give reasons:

  • Ethanal is more reactive towards nucleophilic addition reactions than propanone.
  • HCHO reacts with HCN faster than CH3
  • Acetaldehyde gives aldol condensation while formaldehyde does not.
  • Ethanoic acid is highly soluble in water but hexanoic acid is only slightly soluble.
  • A carboxylic acid does not form an oxime although there is present a carbonyl group in carboxylic functional group. (5)

29 Answer the following questions briefly:

(i) What are any two good sources of vitamin A?

(ii) What are nucleotides?

(iii) What are enzymes?.

(b) How are carbohydrates classified?                                            (3+2)

OR

(a)State differences between the following:

(i) a- helix and b pleated sheet structure.

(ii) Primary and secondary structure of a protein.

(iii) Enzymes and co-enzymes.

(b) What are essential and non-essential amino acids? Give two examples of each.

30 (a) With the help of a graph , explain why it is not easy to determine l0 for a weak electrolyte by extrapolating the concentration versus molar conductivity curve as for strong electrolytes.                                   (2)

(b) For the cell , Mg½Mg2+(aq) ½½Ag+(aq)½Ag, calculate the equilibrium constant at   250C and also the maximum work that can be obtained by operating the cell. E0(Mg½Mg2+)=-2.37V and E0(Ag+½Ag)=+0.80 V                                          (3)

  OR

What are primary and secondary cells? Discuss construction and working of lead storage battery.                                           (5)

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