Old Question Paper 2071 – Chemistry | Science Class 11

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ChemistryOld Question Paper of Chemistry – Old is Gold
For: Science Grade XI
Year: 2071 (2014) | Subject Code: 112 ‘D’

Candidates are required to give their answer in their own words as far as practicable. The figures in the margin indicates full marks.
Time: 3 hrs | Full Marks: 75 | Pass Marks: 27

Group ‘A’

Attempt any fifteen questions. [15 X 2 = 30]

  1. 12gm of carbon react with 4gm of hydrogen to produce 16gm of methane. Which chemical law do these data illustrate. State the law. [1 + 1]
  2. How many number of gold atoms are present in 0.6gm of 18 carat gold. The 24 carat gold is taken as 100% pure gold. (atomic mass of gold = 197). [2]
  3. Distinguish between crystalline and amorphous solid giving an example of each. [1 + 1]
  4. Boiling point of liquid P and Q are 70°C and 90°C respectively. Which of the two has higher vapour pressure at 70°C? Give reason. [2]
  5. Write the electronic configuration for the atom having atomic number 19. What are the values of n and l of its outermost electron? [1 + 1]
  6. Which principle goes against the concept of Bohr’s fixed orbits? State the principle. [1 + 1]
  7. What is thermonuclear reaction? Write an example of it. [1 + 1]
  8. What is meant by intra-molecular hydrogen bonding? Give an example of it. [1 + 1]
  9. Write down the Lewis structure of the compound formed by two elements A and B whose outermost electrons are represented by 3S2 and 3S23p5 respectively. [2]
  10. Which one N or O has more electron affinity and why? [2]
  11. Calculate the oxidation number of underlined atom in the following compounds: [1 + 1]

a) NH4No3
b) Cr2O7-2

12. Define equilibrium constant(Kc). What would be the expression for Kc in the following reaction [1 +1]
C(s) + CO2(g) ⇋  2CO(g)
13. Why is water an excellent solvent for polar substances? [2]
14. Give reason: [1 + 1]

a) Co2 as an acidic oxide
b) Al2O3 as an amphoteric oxide

15. Name any two gaseous compounds of each which are responsible for: [1 + 1]

a) Photochemical smog
b) Green house effect.

16. Give balanced chemical equation for the preparation of [1 + 1]

a) Phosphine
b) Carbon-monoxide

17. What is meant by hydrometallurgy? Give an example of it[1 + 1]
18. Define the terms: [1 + 1]

a) Dead burnt plaster
b) Available chlorine

19. Give the IUPAC name of the following compounds: [1 + 1]

Q.N 19 Chemistry Chemical Reaction

20. Identify the major product A and B of the following and write their IUPAC name. [2]

Q. 20 Chemical Reaction

21. How would you detect the presence of sulphur in the organic compound? [1 + 1]
22. Define gasoline addative and give an example of gasoline addative. [1 + 1]

Group ‘B’

Attempt any five questions. [5 X 5 = 25]

23. Write the essential postulates of Bohr’s model of an atom. How does this model correct the defect of Rutherford’s atomic model? [4 + 1]
24. 8gm of pure calcium is treated with 50gm of pure HCl to giv CaCl2 and H2: [1 + 1 + 1 +2]

a) Which is limiting reactant?
b) Calculate the mass of unreacted left over.
c) What mass of CaCl2 will be formed?
d) How many moles of water will be produced if the whole H2 formed in the reaction react with O2?

25. Distinguish between oxidant and reactant. Balance the following equation by oxidation number method. [1 + 4]

KMnO4 + HCl → KCl + MnCl2 + H2O + Cl2

26. Give a suitable reaction for the preparation of each of each of: [1 + 1 + 1 + 1 + 1]

a) Ethane
b) Ethyne
How does ethyne react with
i) Water
ii) Curprous chloride.
How would convert ethyne into ethane?

27. Give balanced chemical equation for the preparation of ammonia from nitrogen and hydrogen. What are the proper physical conditions for better yield of ammonia? Write the action of ammonia on: [1 + 1 + 1 + 1 + 1]

aa) Mercurous nitrate paper
b) CuSO4 solution
c) CuO

28. Write the chemistry of plaster of paris. [5]
29. Explain, how bromine is manufactured from carnallite? Why are halides found in sea water?

Group “C” – Attempt any two questions. [2 X 10 = 20]

30. Draw a self explanatory sketch for the manufacture of sulphuric acid by contact process and explain the principle and procedure involved in it. Why is it called contact process? How does i) conc. H2So4 react with i) sugar ii) copper. Write down the text reaction of sulphate ion in its aqueous solution? [6 + 1 + 2 + 1]

31. Explain the chemistry of Caster-Kellner process for the manufacture of caustic soda. Write down the action the action of caustic soda with i) Zn ii) sulphur iii) ammonium chloride. How is caustic soda converted into washing soda? [6 + 3 + 1]

32. What are the postulates of kinetic molecular theory of gas? Distinguish between an ideal gas and a real gas. An evacuated glass vessel weights 50 gm when empty, 148 when filled with a liquid of density 0.98 g/cc and 50.5 g when filled with an ideal gas at 760 mmHg at 27°C. Calculate the volume of the ideal gas at STP. [4 + 2 + 4]

33. Write short notes on any two: [2 X 5 = 10]

a) Classification of hydrocarbon.
b) Advantages of modern periodic table.
c) Relation between Kp and Kc.
d) Lassaigne’s test for nitrogen.

Posted By : MeroSpark | Comment RSS | Category : Class XI, HSEB Notes
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8 Comments

  1. Subham Shrestha
    Posted March 29, 2015 at 11:05 pm

    Dont you have the solutions of these papers?

    • MeroSpark MeroSpark
      Posted March 30, 2015 at 8:25 am

      Currently, we do not have solution. We are working on it. Please subscribe our Updates. We will post soon. Thanks for your comment.

    • sneha_khanal
      Posted May 13, 2016 at 8:38 am

      Exactly

  2. Binod Adhikari
    Posted April 29, 2015 at 2:25 pm

    Where are the long questions ? (Group C )

    • MeroSpark MeroSpark
      Posted May 2, 2015 at 9:50 pm

      Thanks for the info Binod. We have mistakenly not posted the questions of Group C. We have recently updated it. Thank you very much.

  3. Roman chamlagain
    Posted November 20, 2015 at 5:28 pm

    Where are the solution?

  4. sneha_khanal
    Posted May 13, 2016 at 8:37 am

    Gud☺☺

  5. Biraj Kafle
    Posted September 20, 2016 at 7:41 am

    When the solution of this paper will get uploaded?

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