Padasalai.Net s Centum Coaching Team Question Paper 2016-17 · 2017-02-10 · b. Explain the...

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Padasalai.Net’s Centum Coaching Team – Question Paper 2016-17

SUB : CHEMISTRY centum paper TOTAL MARK : 150

STD : XII TIME : 3.00 HRS

PART – I

CHOOSE THE CORRECT ANSWER 30X1=30

1. Energy of hydrogen atom in the second orbit is _____________________

a. -328KJ/mol b. -1312 KJ/mol c. 984 KJ/mol d. -146KJ/mol

2. The bond length of C-C in ethane ____________________

a. 1.44 A0 b. 1.98 A

0 c. 2.28 A

0 d. 1.54 A

0

3. Which radio active element discover by Marie Curie ________________

a. U b. Po c. Th d. Sr

4. Composition of nichrome

a. Cr=65%, Fe=35% b. Cr=15% Ni=60% Fe=25%

c. Cr=20-35%, Co=40-80%, Ni=0.25%, C=0.75-2.5% d. Cr=11-13%, C=0.1-0.4%, Fe=73%,

Ni=8%

5. Which one of the following used to identification of chloride ions

a. ZnCO3 b. Al2O3 c. AgNO3 d. CuSO4

6. ______________ used as a power source in long mission space probes.

a. U-235 b. Pu-238 c. Cm-98 d. No -102

7. Anti-tumour drug in medicine is _____________

a. tripolyphosphate b. 2,2’-bipyridyl

c. Al (Oxime)3 d. cis [ Pt (NH3)2 Cl2 ]

8. 17Cl37

(______, n) 18 Ar38

a. α b. c. D d. n

9. Coordination number of BN is _______________

a. 8 b. 6 c. 4 d. 3



10. Calculate the ∆Hvap of H2S, the boiling point of H2S is -59.6 C

a. 30.71 KJ mol-1

b. 29.376 KJ mol-1

c. 18.74 KJ mol-1

d. -1312 KJ mol-1

11. In the reversible reaction 2HI H2 + I2, Kp is

a) greater than Kc b) less than Kc c) Equal to Kc d) Zero

12. Order of the following reaction is H2O2+2I-+2H

+ I2+2H2O

a. 5 b.4 c.3 d.2

13. 2H2O2 2H2O+O2 negative catalyst is _______

a. Alcohol b. glycerine c. MnO2 (d) Fe/Mo

14. Unit of k (kappa) is ___________

a. Siemen b. mho c. S.m-1

d. All of these

15. How many resonance structure possible in phenolate ion

a. 3 b. 5 c. 2 d.4

16. C2H5-O-C2H5+BF3 ?

a. (C2H5)2 –O : BF3 b. C2H5

O : BF2+F

C2H5

C2H5

c. O:BF+ F2 d. C2H5

C2H5 O:B+F3

C2H5

17. CH3 CH3

C=0

CH2+N2+H2O name of the reaction is ____________

H H

a. claisen reaction b. Novanagal reaction

c. wolfkrishnar reaction d. HVZ reaction



18. Which compound used for treatment of digestive disorder in children.

a. acetone b. lactic acid

c. phenol d. Urotropine

19. The hybridision of H2O

a. SP3 b. SP

3d c. SP

3d

2 d. SP

3d

3

20. Number of unpaired electron in Ti 3+

________________

a. 1 b.2 c. 3 d. no unpaired

21. Which one of the following is not axocation ?

a.UO2+

b.NPO4+

c.Ce4+

d. PUO22+

22. The condition for spontaneous reaction at constant T and P is _____________

a. ∆G < 0, ∆H < 0, ∆S > 0 b. ∆G = 0, ∆H = 0, ∆S = 0

c. ∆G > 0, ∆H > 0, ∆S < 0 d. ∆G < 0, ∆H > 0 , ∆S > 0

23. When forward reaction is possible

a. QKc c. Q=Kc d.

>o

24. Which catalyst is used for the synthesis of petrol from coal.

a. NO b. CuCl2 c. Fe2O3 d. Fe/Mo

25. ___________ used in eye lotion

a. argerol b. colloidal Au c. milk of megnesia d. colloidal Sb

26. For chemisorption, which is wrong

(a) irreversible (b) it requires activation energy

(c) it forms multimolecular layers on adsorbate (d) surface compounds are formed

27. Williamson's synthesis is an example of

(a) nucleophilic addition (b) electrophilic addition

(c) electrophilic substitution (d) Nucleophilic substitution reaction

28. IUPAC name of 2 -(N, N- dimethylamino) butane

CH3



a) CH3-NH-CH-CH3 b. CH3-CH-CH-CH3

CH3 NH2

c) CH3-CH-CH2-NH2 d. CH3 -N- CH- CH2 CH3

CH3 CH3 CH3

29. Boiling point of amine on the bases of hydrogen bonding ?

a. 2 >1 >3 b. 1 >2 >3 c. 3 >2 >1 d. 2 >3 >1

30. Molecular formula of Galactose

a. C6H1206 B.C12H22O11 C. C18H32O16 D. (C6H10O5)n

PART –II

ANSWER ANY FIFTEEN QUESTION OF THE FOLLOWING 15X3=45

31. What is the significance of negative electronic energy?

32. Calculate the effective nuclear charge of 4s electron in K atom.

33. Write any three uses of orthophosphuric acid.

34. Write the equation effect of heat on copper.

35. Write the nuclear reaction taking place in star.

36. What is mean by unit cell.? draw the structure.

37. Calculate the entropy change of phase transitions reaction of following.

1 mole Sn( α, 13 C ) 1 mole Sn( β, 13 C ) ( H transition = 2090 J mole -1

)

38. Write the equilibrium constant for HI formation reaction.

39. Write characteristics of first order reaction.

40. What are the factors affecting adsorption.

41. Write a note on p-type semi-conductore.

42. Distinguish structural , Geomentrical isomers.

43. How nitro glycerine is prepared.

44. Define order of reaction.

45. What is mean by perkins reaction?



46. What heppen when calcium salt of fatty acid is heated.

47. Write sandmeryer reaction.

48. How polystyrene prepared. write uses.

49. Identify the produt of the following.C2H5OH+ NH3

?

50. Expline the structure and hybridation of IF5

51. How gold react with aquaregia?

PART – III

ANSWER ANY SEVEN QUESTIONS ATLEAST TWO QUESTONS WRITE EACH SECTION 7X5=35

SECTION –A

52. Draw the molecular orbital diagam of O2 molecule.

53. Mention the ore and extraction of gold by Mac-Arthur and Forrest’s

cyanide process

54. What is mean by lanthanide contraction and write its causes and consequence.

55. Explain the function of chlorophill in natural process

SECTION – B

56. Define tha following trems i) standerd free energy ii) standerd entropy.

57. State le-chatleir principle , How temperature and pressure affect the equibirium.

58. Show that for a first order reaction, the time required for 99.9% completion of the reaction is 10 times

that required for 50% completion.

59. Write the IUPAC convention of cell diagram.

SECTION – C

60. Write the difference between anisole and diethylethar.

61. Which of the compound gives the following product by clemmention reduction.

i) 2-methylpropane. ii) ethyl benzene. iii) diphenyl methana.

62. How following converstion is take place.

i) salicylic acid to asprince. ii) salicylic acid to methyl salicilate. ii) lactic acid to lactide.

63. Write briefly on antibiotics ? In what way antipasmodics are helpful ?



PATR – IV

ANSWER ANY FOUR QUESTION FROM THE FOLLOWING Q.NO 70 IS COMPULSORY

64. a. Calculate the ionic radii of K+ and Cl

– ions in KCl crystal. The inter nuclear

distance between K+ an Cl

- ions are found to be 3.14Å.

b. Describe in detail how noble gases are isolated from air?

65.a. Explain the structure and hybridization of any two octahedral complexes by using VB theory.

b. The decay constant for 6C14

is 2.31X10-4

year-1

calculate the half life period.

66. a. i) write Braggs equation? ii) Explain braggs spectrometer method

b. write General characteristics of catalytic reactions

67. a. what is common ion effect? Explain with two equation.

b. How to calculate emf of half cell.

68. a. Describe the D, L-system of designation of configurations.

b. Explain the mechanism of esterification reaction.

69. a. Explain the mechanism of Hoffman bromamide reaction.

b. How peptide bond s form? Explain with equation.

70.a. Organic compound A with molecular formula C6H6 react with compound B molecular formula C3H6

in the presence of anhydrous AlCl3 to produce compound C (C9H12) and it oxidized in air to produce

compound D (C9H12O2), compound D react with HCl it produce compound E (C6H6O). Find A,B,C,D and

E Explain the reaction.

b. Element A belongs to group number 6 period number 4 it present in iron mixed ore B. A on heating at

2000◦C it produce oxide compound C. A react with con H2SO4 produce sulphate compound D and liberate

gas E . Find A,B,C,D and E Explain the reaction.

(OR)

c. The molecular formula of C3H6O having two functional isomers of A and B, A answer with tollens

reagent . A,B react with Cl2 produce C and D. A under goes condensation reactions produce compound E.

Find A,B,C,D and E Explain the reaction.

d. Calculate the PH

of 0.1M acedic acid dissociation constant of acedic acid is 1.8X 10 -5


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