Chemistry
Previous year question paper with solutions for Chemistry Dec-2016
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Question paper 1
SECTION- A
Q1 (A) Fill in the blanks
1. The dimensional formula of surface tension is ________.
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2. Positively charged ions are called ____________.
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3. The volume occupied by 0.5 mole of Helium at S.T.P will be__________.
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4. Electrons, protons and neutrons are called ___________ particles.
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5. Horizontal rows are called __________.
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6. A covalent bond is formed by ______________ of half-filled atomic orbitals.
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7. _____________ hardness can be removed by boiling.
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8. Reduction involves ___________ of electrons.
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9. CnH2n is the general formula of ____________.
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10. Blood is a __________ solution.
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State True or False
1. Hard water does not give lather with soap.
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2. The solution having pH value more than 7 is acidic in nature.
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3. Lead acid cell is a primary cell.
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4. The property of carbon to form long chain molecules is called catenation.
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5. The shape of p-orbital is dumb-bell.
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SECTION - B
Q2. Attempt any 10 questions
1. Define chemical equation. What are the essentials of a chemical equation?
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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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3. Differentiate between an orbit and an orbital.
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4. Calculate the number of moles in 200g of CaCO3.
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5. State and explain Aufbau’s principle.
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6. Give the characteristics of drinking water.
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7. Differentiate between sigma (σ) and pi (π) bond.
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8. The nucleus of an atom contains 12 neutrons and 11 protons. Find its atomic number and mass number.
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9. State and explain Boyle’s law.
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10. State Le-Chatelier’s principle.
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11. Explain open, closed and adiabatic systems.
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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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13. Give the functional groups of following compounds
(i) Aldehydes (ii) Amines (iii) Alcohols
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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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SECTION- C
Attempt any 3 questions
Q3 (a) Name and explain the four quantum numbers.
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(b) What are the successes of Bohr’s model of atom?
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Q4 (a) Define hybridization. Explain sp, sp2 and sp3 .
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(b) What are the factors which favour the formation of an ionic bond?
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Q5 (a) Explain ion-exchange process for softening of hard water.
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(b) Explain Priming and Foaming. Write the various methods to prevent it.
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Q6 (a) State and explain Faraday’s first law of electrolysis.
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(b) Explain the working of a dry cell.
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(c) What is salt bridge? Give its two functions.
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Q7 (a) Give characteristics of homologous series.
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b) Differentiate between alkenes and alkynes.
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(c) Write the common and IUPAC names off the following compounds.
(i) CH3CHO (ii) C2H5OH (iii) CH3COCH3
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(d) Explain the term catenation.
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Question paper 2
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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b. Coating of iron with zinc by hot dipping method is called ..............
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c. Slag is a product of ......... and ........... .
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d. Brass is manily a mixture of ................ and ................... metal.
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e. Producer gas is mixture of ............ and .................... .
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f. Carbon monoxide is ............. toxic than CO2.
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g. The unit of heat is ............ .
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h. Acid refractories are resistant to ..............
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i. Pigment varnish is called ..............
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j. PAN means .......... .
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Q.2 State True or False
a. All ores are minerals.
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b. Brass is ferrous alloy.
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c. Ultra mine is a white pigment.
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d. Nylon66 is a copolymer.
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e. Scale formation in boiler cause wastage of fuel
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SECTION B
Q.3 Note: Attempt Any Six question
a. Explain Roasting and calcination?
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b. Explain electromagnetic separation process for the concentration of ores?
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c. Define fire point, viscosity , viscosity index, pour point and cloud point of oil?
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d. Comparison of chemical and electro-chemical corrosion?
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e. What is fuel? What are the characteristic of good fuel?
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f. Differentiate between thermoplastic and thermosetting plastic with example?
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g. What are refracteries? What are the characteristic of good refracteries?
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h. What is water Pollution? Give the sources of water pollution?
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SECTION -C
Q.4 Attempt any Five questions:
i. Differentiate between addition polymer and condensation polymer?
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ii. Define the term lubricant? What are the function of lubricant?
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iii. What is biogas? Give its composition and uses?
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iv. Distinguish between octane number and cetane number?
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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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vi. What are the theories of corrosion? Describe briefly the acid theory?
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vii. What is acid rain? What are its harmful effects?
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viii. Explain.
i) Zone Refining process
ii) Froth floatation process
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