Solved question paper for CHEM Dec-2016 (DIPLOMA Mechanical Engineering (RAC) 1st-2nd)

Chemistry

Previous year question paper with solutions for Chemistry Dec-2016

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Question paper 1

  1. SECTION- A

    Q1 (A) Fill in the blanks

    1. The dimensional formula of surface tension is ________.

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  2. 2. Positively charged ions are called ____________.

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  3. 3. The volume occupied by 0.5 mole of Helium at S.T.P will be__________.

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  4. 4. Electrons, protons and neutrons are called ___________ particles.

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  5. 5. Horizontal rows are called __________.

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  6. 6. A covalent bond is formed by ______________ of half-filled atomic orbitals.

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  7. 7. _____________ hardness can be removed by boiling.

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  8. 8. Reduction involves ___________ of electrons.

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  9. 9. CnH2n is the general formula of ____________.

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  10. 10. Blood is a __________ solution.

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  11. State True or False 

    1. Hard water does not give lather with soap.

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  12. 2. The solution having pH value more than 7 is acidic in nature.

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  13. 3. Lead acid cell is a primary cell.

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  14. 4. The property of carbon to form long chain molecules is called catenation.

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  15. 5. The shape of p-orbital is dumb-bell.

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  16. SECTION - B

    Q2. Attempt any 10 questions

    1. Define chemical equation. What are the essentials of a chemical equation?

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  17. 2. If the quantum number ‘n’ has a value of 4, what are the permitted values of quantum number l and m?

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  18. 3. Differentiate between an orbit and an orbital.

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  19. 4. Calculate the number of moles in 200g of CaCO3.

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  20. 5. State and explain Aufbau’s principle.

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  21. 6. Give the characteristics of drinking water.

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  22. 7. Differentiate between sigma (σ) and pi (π) bond.

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  23. 8. The nucleus of an atom contains 12 neutrons and 11 protons. Find its atomic number and mass number.

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  24. 9. State and explain Boyle’s law.

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  25. 10. State Le-Chatelier’s principle.

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  26. 11. Explain open, closed and adiabatic systems.

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  27. 12. Calculate the weight of Cu deposited, when a current of 0.5 ampere is passed for 20 minutes through a solution of CuSO4.( ECE of Cu= 0.00032)

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  28. 13. Give the functional groups of following compounds

    (i) Aldehydes (ii) Amines (iii) Alcohols

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  29. 14. A sample of hard water is found to contain 204 mg of CaSO4/L. What will be its hardness in ppm?

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  30. SECTION- C

    Attempt any 3 questions  

    Q3 (a) Name and explain the four quantum numbers. 

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  31. (b) What are the successes of Bohr’s model of atom? 

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  32. Q4 (a) Define hybridization. Explain sp, sp2 and sp3 . 

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  33. (b) What are the factors which favour the formation of an ionic bond?

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  34. Q5 (a) Explain ion-exchange process for softening of hard water. 

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  35. (b) Explain Priming and Foaming. Write the various methods to prevent it.

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  36. Q6 (a) State and explain Faraday’s first law of electrolysis.

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  37. (b) Explain the working of a dry cell. 

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  38. (c) What is salt bridge? Give its two functions.

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  39. Q7 (a) Give characteristics of homologous series.

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  40. b) Differentiate between alkenes and alkynes. 

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  41. (c) Write the common and IUPAC names off the following compounds.

    (i) CH3CHO (ii) C2H5OH (iii) CH3COCH3

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  42. (d) Explain the term catenation.

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Question paper 2

  1. SECTION –A

    Q.1 Fill in the blanks

    a. Slow but continuous eating away of the metal by the chemical action with surrounding is called _________.

     

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  2. b. Coating of iron with zinc by hot dipping method is called ..............

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  3. c. Slag is a product of ......... and ........... .

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  4. d. Brass is manily a mixture of ................ and ................... metal.

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  5. e. Producer gas is mixture of ............ and .................... .

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  6. f. Carbon monoxide is ............. toxic than CO2.

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  7. g. The unit of heat is ............ .

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  8. h. Acid refractories are resistant to ..............

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  9. i. Pigment varnish is called ..............

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  10. j. PAN means .......... .

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  11. Q.2 State True or False

    a. All ores are minerals.

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  12. b. Brass is ferrous alloy.

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  13. c. Ultra mine is a white pigment.

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  14. d. Nylon66 is a copolymer.

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  15. e. Scale formation in boiler cause wastage of fuel

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  16. SECTION B

    Q.3 Note: Attempt Any Six question

    a. Explain Roasting and calcination?

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  17. b. Explain electromagnetic separation process for the concentration of ores?

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  18. c. Define fire point, viscosity , viscosity index, pour point and cloud point of oil?

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  19. d. Comparison of chemical and electro-chemical corrosion?

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  20. e. What is fuel? What are the characteristic of good fuel?

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  21. f. Differentiate between thermoplastic and thermosetting plastic with example?

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  22. g. What are refracteries? What are the characteristic of good refracteries?

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  23. h. What is water Pollution? Give the sources of water pollution?

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  24. SECTION -C

    Q.4 Attempt any Five questions:

    i. Differentiate between addition polymer and condensation polymer?

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  25. ii. Define the term lubricant? What are the function of lubricant?

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  26. iii. What is biogas? Give its composition and uses?

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  27. iv. Distinguish between octane number and cetane number?

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  28. v. A sample of coal contains 60% carbon, 33% oxygen, 6% hydrogen, 0.5% sulphur, 0.3% nitrogen and 0.2% ash. Calculate gross calorific value of coal?

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  29. vi. What are the theories of corrosion? Describe briefly the acid theory?

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  30. vii. What is acid rain? What are its harmful effects?

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  31. viii. Explain.

    i) Zone Refining process

    ii) Froth floatation process

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