Old Question Paper 2070 – Chemistry | Science Class 11

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ChemistryOld Question Paper of Chemistry
Year: 2070 (2013) – Old is Gold
For: Science Grade XI

Subject Code: 112 ‘D’ | Time: 3 hrs | Full Marks: 75 | Pass Marks: 27
Candidates are required to give their answer in their own words as far as practicable. The figures in the margin indicate full marks.

Group ‘A’

Attempt any fifteen question: [15 X 2 = 30]
1. Which of the following gases has greater number of hydrogen molecule? [2]

9gm of CH4 or 10gm of NH3

2. What mass of H2 gas will react with 22.4 liters of O2 at STP to produce 36 gram of water. [2]
3. Write any two physical properties of liquid caused by surface tension. [1 + 1]
4. Distinguish isotropic and anisotropic substance with one example of each. [1 + 1]
5. An atom ‘A’ has atomic number (Z = 29). Calculate the total number of s-electrons of A++ [2]
6. State Pauli-exclusion reaction? Give an example of it. [2]
7. What is meant by nuclear reaction? Give an example of it. [1 + 1]
OR
Write a Covalent Compound formed by nitrogen and oxygen. What is its Lewis structure? [1 + 1]
8. Define Polar Covalent bond and give an example of it. [1 + 1]
9. How does hydrogen bond affect the physical properties of compound? [2]
10. On what basis does Mendeleev’s periodic Law differ from Modern periodic Law? [1 + 1]
11. Find the Oxidation number of nitrogen in: [1 + 1]

a) Ammonia
b) Ammonium Sulphate

12. What is meant by equilibrium constant (Kc). Write a chemical equilibrium in which Kc become equal to Kp. [1 + 1]
13. Classify the following oxidex.

N2O3       NO3         BaO2     and        Fe2O3

14. How is oxygen converted into ozone? Mention major one use of ozone. [1 + 1]
15. Write the molecular formula of each of the followings. [4 X 0.5]

a) Hypophospheric acid
b) Hypo
c) Borax
d) Silica gel

16. How is acid rain formed? [2]
17. Write a chemical reaction involved in [2]

a) Carbon reduction process.
b) Alumino thermite process.

18. Starting from sodium, how would you prepare Na2Co310H2O? [2]
19. Write down the IUPAC name of the following compounds. [1 + 1]

a)

 Chemistry-equation

b) CHO – CH = CH – CHO

20. A haloalkane ‘X’ undergoes Wurtz reaction to give 2, 3-dimethyl butane as the major product. Identify ‘X’ and write chemical reaction: [1 + 1]
21. Explain why, [1 + 1]

a) Sodium extract is alkaline in nature.
b) Organic compounds are combustible.

22. What is the function of Tetraethyl lead (TEL) in gasoline? [2]

Group ‘B’

Attempt any five questions: [5 X 5 = 25]
23. For a reaction, [1 + 1 + 1 + 2]

Ca(OH)2(aq.) + 2NH4Cl (aq.)→ CaCl2(aq.) + 2NH3(g) + 2H2O(l)
The reaction is carried out by mixing 7gm of pure Ca(OH)2 and 7gm of pure NH4Cl.
a) Find the limiting reactant.
b) Calculate the mole of unreacted reactant left over.
c) How many gram of CaCl2 are formed?
d) What volumes of NH3 gas are produced at 27°C and 1.5 atmospheric pressure?

24. What is meant by oxidation number? Balance the following equation by oxidation number or ion-electron method indicating oxidant and reductant. [1 + 4]

NaOH + S → Na2S + Na2S2O3 + H2O

25. What are the conclusion made by Rutherford from his α-ray scattering experiment about the structure of atom? Mention its limitation. [4 + 1]
26. Define Homologous series and write its important characteristics. What is the IUPAC name of 1st member of ketone? [1 + 3 + 1]
27. Write balanced chemical reaction for the preparation of ammonia by Haber’s process. How does ammonia react with [2 + 3]

a) Sodium
b) Chlorine
c) CuSo4 solution

28. How is bromine manufactured from carnallite. Write any one use of bromine. [4 + 1]
29. Give the chemistry of quick-lime. What happens when water is added to quick-lime? [4 + 1]

Group ‘C’

Attempt any two questions: [2 X 10 = 20]
30. Sketch a well labeled diagram for the manufacture of sodium hydroxide and explain the principle involved in the process. How does it react with [6 + 2 + 2]

a) CO2
b) Zn

Write any two uses of sodium hydroxide.

31. Starting from iron-pyrites, how would you obtain dilute sulphuric acid by contact process? Explain with a labeled diagram. Give the action of Conc. H2So4 on: [7 + 1 + 1 + 1]

a) Sucrose
b) HI
What is the text of sulphate ion?

32. Explain, how Charle’s law gave the concept of absolute scale of temperature. Derive the relation PV = nRT. A hydrocarbon CxHy has mass ratio between hydrogen and carbon 1:10.5. One liter of the hydrocarbon at 127°C and 1atm. Pressure weighs 2.8gm, find the molecular formula of the hydrocarbon. [2 + 4 + 4]
33. Write short note on any two: [2 X 5 = 10]

a) Laboratory preparation of ethane.
b) Isomerism in organic compound. (Structure isomer only)
c) Relation between Kp and Kc
d) Disadvantage of Mendeleev’s periodic table.

Posted By : Hari Prasad Chaudhary | Comment RSS | Category : Class XI, HSEB Notes
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