Descriptive Section

1. A sample of coal has the following composition by mass:

C = 85%, H = 6%, O = 8%, S = 0.5% and Ash = 0.5%. Calculate HCV and LCV
using Dulong’s Formula. Given Atomic Weights: C=12, H = 1, S = 32, O = 16

2. Discuss differential aeration corrosion with the help of a suitable example.

3. Explain the conventional and Green route of manufacturing Carbaryl. Highlight the
green chemistry principle involved.

4. Define Spectroscopy and Electromagnetic spectrum. Also explain the origin of

spectrum.

5. The standard emf of the following cell is 0.462 V.

Cu(s) / Cu+2 (aq)(1M) // Ag+(aq)(1M) / Ag(s)
Write the cell reaction. If the standard potential of Cu electrode is 0.337 V, what is
the standard potential of Ag electrode?

6. What is cathodic protection? What are the two types of cathodic protection?
Discuss any one with the help of a suitable diagram.

7. Calculate the percentage atom economy for the following reaction with respect to
acetanilide.
C6H5NH2 + (CH3CO)2O C6H5NHCOCH3 + CH3COOH
Given Atomic Weights: C = 12, H = 1, O = 16, N = 14

8. Calculate the volume of air required for complete combustion of 1m3 of gaseous
fuel having the following composition: CO = 5%, C2H4 = 10%, CH4 = 40%, N2 =
2.5 %, H2 = 35%, CO2 = 2%, O2 = 2.5%
Given Atomic Weights: C = 12, H = 1, O = 16, N = 14

9. How do the following factors affect the rate of corrosion:

(i) relative areas of anodic to cathodic part

(ii) position of metal in galvanic series.

10. (i) Distinguish between anodic and cathodic coating.

(ii) What is Biodiesel? Give the trans-esterification reaction of the preparation of

Biodiesel.

11. Explain the conventional and Green route of manufacturing Adipic acid. Highlight
the green chemistry principle involved.

12. Give in tabular form the relation between electromagnetic spectrum, types of
spectroscopy and corresponding energy changes.

13. What is an electrochemical cell? What are the types of electrochemical cell? Briefly
discuss the different types.
14. What is green chemistry? Explain the principle of ‘Designing safer chemicals and
products’ and the principle of ‘Use of renewable feedstocks’.

15. (i) 1 g of coal sample was used for determination of nitrogen by Kjeldhal’s method.
The ammonia evolved was passed into 50 ml of 0.1 N H2SO4. The excess acid
required 42 mL of 0.1 N NaOH for neutralisation. Calculate the percentage of N in
the sample.

(ii) One of the design and material selection principle is ‘ the anodic material
should not be painted or coated’ . Give reason for the same.

16. Discuss season cracking.

17. What are ‘oxygenates’ used in the fuel industry? Where and why are they added?
Explain by giving examples.

18. By kjeldahl’s method 3 gm of coal sample was analysed. The ammonia evolved
was absorbed in 40 ml of 0.5 N H2SO4. After absorption, the excess
H2SO4 required 18.5 ml of 0.5N KOH for neutralization. A coal sample was
subjected to ultimate analysis 2.45 g of coal on combustion in a Bomb-Colorimeter
gave 0.67 of BaSO4. Calculate percentage of Nitrogen and sulphur.
19. Discuss Bimetallic corrosion with the help of a suitable example
20. Explain the conventional and Green route of manufacturing indigo dye. Mention
the green chemistry principles involved.
21. Explain construction and working of SHE with neat and labeled diagram.
22. Explain different types of electromagnetic radiations.
23. Draw a diagram of a cell made up of aluminium and silver half cells. Give
representation of the cell along with electrode reactions.
24. Calculate the volume and weight of air required for complete combustion of 1m3 of
gaseous fuel having the following composition: CO = 10%, C3H8 = 12%, CH 4 =
30%, N 2 = 3 %, H 2 = 40%, CO2 = 3%, O2 = 2.0% (Molecular weight of air
=28.949).
25. How do the following factors related to nature of environment affect corrosion? i)
Anodic and Cathodic area ii) Purity of metal
26.

Find atom economy of the reaction with respect to 2-methyl propene.

27. Explain ‘Selection rules’ that basically decide which transitions are ‘allowed or
forbidden’ in spectroscopy
28. Distinguish between Octane number and Cetane number
29. i) Explain the principle of ‘use of catalytic reagent’ with respect to green
chemistry.
ii) How would you synthesize benzimidazole using green catalyst.
30. Calculate the minimum amount of air required for the complete combustion of
1 kg of fuel containing C= 80%, H= 6%, O=8%, S= 1.5%, H2O= 1.0%,
 N= 1.5% and ash= rest.
31. Explain why a “pure Zinc metal rod half immersed in saline water starts
corroding at the bottom” Explain with neat diagram, reactions &
corrosion product formation.
32. Explain construction and working of a reference electrode which is used in pH
meter.
33. Write cell reaction and calculate the standard emf of the following cell.
Cd(s)│ Cd +2 (aq)(1M)║ Ni2+ (aq)(1M)│Ni(s)
If the standard potential of Cd electrode is -0.40 V and the standard potential of
Ni electrode is -0.25 V
34. Write a note on Catalytic converter with the help of chemical reactions.
35. i) Give significance of determination if moisture in coal.
ii) What is season cracking?
36. Which molecule is used as a component in various therapeutic drugs? Give any
one traditional and green synthesis of the same.
37. Write the Nernst Equation and calculate Emf of the following cell at 298K:
Mg(s)/Mg2+(0.001M) || Cu2+(0.0001M)/Cu(s).
0 0
𝐺𝑖𝑣𝑒𝑛: 𝐸𝐶𝑢2+/𝐶𝑢 = 0.34 V and 𝐸𝑀𝑔2+/𝑀𝑔= -2.37 V
38. With the help of traditional and green synthesis of ibuprofen, list the principles of
green chemistry involved in it.
39. What is knocking? How is knocking of gasoline related to chemical structure of
hydrocarbons present in it? Define octane rating.
40. A sample of coal was found to contain C = 80%, H = 5%, O = 1%, N = 2%,
Ash=12%. Calculate the minimum amount of air required for complete combustion
of 1kg of coal sample.
41. Draw the energy level diagram showing various molecular energies and explain
why molecular spectra contains broad bands whereas atomic spectra consist of
sharp lines.
42. A cell uses Zn2+/Zn and Ag+/Ag electrodes. Write the cell representation, Half-cell
reactions, Net cell reactions and calculate the standard Emf of the cell.
0 0
𝐺𝑖𝑣𝑒𝑛: 𝐸𝑍𝑛2+/𝑍𝑛 = -0.76 V and 𝐸𝐴𝑔+/𝐴𝑔 = 0.8 V

43. Define Green chemistry. As per Green chemistry Principles, why is it essential to design
energy efficient process. Explain with suitable examples.
44. What is oxidation corrosion. Name the different types of oxide layer formed and state
which oxide layers are non-protective in nature. Explain with suitable examples.
45. Determine C, H, N elements as % from the following observations in experiments of
analysis of coal.
0.25g coal on burning in a combustion tube and passing the gases through tubes containing
anhydrous CaCl2 and KOH increases their weight by 0.09 g and 0.8g respectively. In
Kjeldahl’s method, ammonia evolved by 0.42g coal was absorbed in 49.5ml of 0.12 N HCl
solution. After absorption, the excess acid required 36.5ml of 0.12 N NaOH for
neutralization.
46. What are antiknocking agents? Explain the factors affecting antiknocking
characteristics of a compound
47. What is electrochemistry? Write the cell reaction and Calculate the standard emf of the
following cell (5)
2+ 2+
Zn(s)│𝑍𝑛(𝑎𝑞) (1M)││𝐶𝑢(𝑎𝑞) (1M)│Cu(s)
 0 0
𝐺𝑖𝑣𝑒𝑛: 𝐸𝑍𝑛= -o.763 V and 𝐸𝐶𝑢= 0.337 V
48. What is Green Chemistry? Calculate percentage atom economy for the following reaction
with respect to acetophenone (5)

C6H6 + CH3COCl C6H5COCH3 + HCl

Acetophenone
(Atomic weights: C=12, H=1, O=16, Cl=35.5)
49. Define corrosion. Explain sacrificial anode method with suitable diagram. (5)

50. Calculate the weight and volume of air required for complete combustion of 1 kg of coal
containing
C=65%, H=4%, O=7%, N=3%, moisture=15% and remaining is ash. (molecular weight of
air=28.94 gm) (5)
51. Give the classification of Spectroscopy based on atomic level of study.
Distinguish between absorption and emission spectra. (2+3)
52. What is metallic coating? Differentiate between Galvanizing and Tinning. (5)
53. List 12 principles of Green Chemistry. Explain Biodiesel as a Green fuel (5)
54. List the factors affecting the rate of corrosion. Explain Galvanic cell Corrosion (5)
55. 3.2 gm of coal in Kjeldahl’s experiment evolved NH3 gas was absorbed in 40 ml of 0.5 N
H2SO4. After absorption the excess acid required 16 ml of 0.5N NaOH for complete
neutralization. 2.5 gms of coal sample in quantitative analysis gave 0.42 gm BaSO4.
Calculate the % N and S. (5)
56. Define spectroscopy and explain different regions of electromagnetic spectrum
with the help of diagram
57. What is Electrochemistry? Differentiate between electrolytic cell and Galvanic cell
58. List the 12 Principles of Green chemistry and calculate % atom economy for the
following reaction with respect chlorobenzene
C6H6 +Cl2 C6H5Cl + HCl
Atomic weight C = 12, H = 1, Cl = 35.5
59. What is Electrochemical corrosion? Explain Hydrogen evolution mechanism with
the help of diagram
60. Calculate the amount of air needed for complete combustion of 1Kg of coal
containing C = 65%, H = 13 %, O = 6 %, N = 2% S = 4%
61. Give construction and working of hydrogen-oxygen fuel cell with the help of
diagrams and reactions.
62. What is standard potential? Calculate standard emf of following cell
Zn(s)|Zn2+ (aq) (1M) || Cu2+(aq) (1M) |Cu(s)
Given E0 Zn =-0.763 V and E0 Cu = 0.337V
63. Explain the mechanism of ‘Rusting of iron in water’ with the help of diagram and
reactions.
64. Explain sacrificial anode method for prevention of corrosion with the help of
diagram and also distinguish between Galvanizing and Tinning
65. What is Fuel? and what are ideal characteristics of fuel. Give classification of fuels.