Solved question paper for CHEM May-2018 (DIPLOMA mechanical engineering 1st-2nd)

Chemistry

Previous year question paper with solutions for Chemistry May-2018

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Question paper 1

  1. SECTION-A

    Q1. a) Fill in the blanks:

    i. 1 degree Clark means ……………….. .

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  2. ii. Water is a ……………… solvent.

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  3. iii. The process employed to concentrate an ore is called ………………….. .

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  4. iv. Cementation is the process of …………………. .

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  5. v. Galvanization is the process of depositing ……………………. on iron.

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  6. vi. In combustion of fuels ……………………… reactions occur.

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  7. vii. Gun powder is a mixture of …………….. .

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  8. viii. The unit of viscosity is ……………………. .

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  9. ix. A good lubricant should have …………………… flash point.

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  10. x. Acid Refractoriness are resistant to ………........

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  11. b) State True or False.

    xi. Hard water does not give lather with soap.

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  12. xii. All ores are minerals.

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  13. xiii. Noble gases undergo corrosion.

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  14. xiv. A good fuel has low calorific.

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  15. xv. Viscosity index of oil can be increased by adding acid

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  16. SECTION-B

    Q2. Attempt any six questions.

    a. What are the requisites of water for drinking purposes?

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  17. b. What is the difference between metal and ore?

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  18. c. Explain the term galvanic corrosion?

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  19. d. What do you understand by the analysis of coal? What are its kinds?

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  20. e. What are the advantages of gaseous fuels?

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  21. f. What is meant by oxygen balance and how it is important?

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  22. g. Write a note in Octane number?

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  23. h. How explosives are classified?

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  24. i. Define Refractories? How will you classify Refractories?

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  25. SECTION-C

    Q3. Attempt any five questions.

    i. Explain electromagnetic separation process for the concentration of ores.

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  26. ii. Describe the various methods used to protect the metals from corrosion.

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  27. iii. What are rocket propellants? How are they classified?

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  28. iv. Write a short note on solid lubricant.

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  29. v. Discuss the following properties of lubricants:

    a) Flash point and Fire point

    b) Acid value

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  30. vi. What are the main characteristics of a good refractory?

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  31. vii. What are the major sources of air pollution? What measures do you adopt to avoid it?

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  32. viii. Write a note on Sewage treatment?

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Question paper 2

  1. SECTION-A

    Q1. Do as directed.

    a. The chemical formula of ferric sulphate is _________.

    Answer:

  2. b. A chemical equation in which heat is evolved is called_____________.

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  3. c. Proton was discovered by _____

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  4. d. There are _________ periods in periodic table.

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  5. e. Cations are ___________ charged ions.

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  6. f. The reaction of an acid with a base to form salt and water is called __________

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  7. g. The functional group of amide is____________

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  8. h. Ions are neutrals particles. (T/F)

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  9. i. Ethylene is unsaturated in nature. (T/F)

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  10. j. Reduction involves the loss of electrons. (T/F)

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  11. SECTION-B

    Q2. Attempt any ten questions.

    i. What are the limitations of a chemical equation?

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  12. ii. Define the terms Electron, Proton and Neutron.

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  13. iii. Differentiate between an orbit and orbital.

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  14. iv. Define chemical bond. What is the cause of chemical combination?

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  15. v. What are the advantages of long form of periodic table?

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  16. vi. Differentiate between temporary and permanent hardness of water.

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  17. Answer:

  18. vii. Explain scale and sludge formation.

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  19. viii. State and explain Boyle’s law.

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  20. ix. What are electrolytes and non electrolytes?

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  21. x. How will you define indicator, titration and end point?

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  22. xi. Explain Faraday’s second law of electrolysis.

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  23. xii. What are primary and secondary cell?

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  24. xiii. What is the functional group of

    (a) Alcohols (b) Amide (c) Ketone?

    Answer:

  25. SECTION-C

    Attempt any three questions.

    Q3. a) Give main features of Bohr’s atomic model.

    b) Balance the following equation by hit and trial method.

    5 Fe + H2O Fe3O4 + H  ------->

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  26. Q4. a) State and explain Heisenberg’s uncertainty principle and Aufbau Principle.

     b) Name the four quantum numbers and explain the significance of each quantum numbers.

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  27. Q5. a) What are the various factors affecting the degree of ionization?

     b) what is a buffer solution? Explain the types of buffer solution

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  28. Q6. a) How will you remove hardness of water by permutit process?

     b) Differentiate between reversible and irreversible reactions.

    c) Explain the term catenation.

    Answer:

  29. Q7. a) Differentiate between alkene and alkyne.  

    b) What is the purpose of electroplating?

    c) Explain the concept of redox reaction.

    Answer: