Chemistry | Grade XI | Examination Paper 2074 [2017] | National Examinations Board

NATIONAL EXAMINATIONS BOARD [NEB]
Chemistry - Grade XI
Examination - 2074 (2017)
Regular Students | Subject Code: 112 ‘A’
Time - 3 hrs
Full Marks - 75
Pass Marks - 27
DOWNLOAD PDF | of Exam Paper | Chemistry | Grade XI | 2074 [2017] NEB
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.

Group 'A'

Attempt any fifteen questions. [15x2=30]

1. How many numbers of oxygen molecules are required to produce 220 mg of CO2 according to the reaction? [2]
C + O→ CO2
2. State Gay-lussac's Law of gaseous volume. [2]
3. Give proper reason for the followings. [1+1]
i) Evaporation takes place from the surface of liquid.
ii) Liquid drops are spherical shape.
4. Differentiate between hygroscopic and deliquescent substances giving an example of each. [2]
5. What information is provided by the magnetic quantum number? Give the values of and m for 3Px orbital. [1+1] 6. Calculate the atomic number and number of p-electrons of an atom whose valence shell electronic configuration is 4S2. [2]
7. What is meant by controlled nuclear fission? Mention it's an important application. [1+1]
8. Write down the Lewis structure of  [1+1]
i) N2O     ii) HClO4
9. How would you explain the polarity of a molecule on the basis of dipole moment? [2]
10. Which ion would you expect to have larger size and why? [2]
       Mg+2 or Na+
11. Calculate the oxidation number of  [1+1]
i) N in NH4OH
ii) Cr in K2Cr2O7 
12. Write the relationship between Kp and Kc for the reaction [1+1]
i) PCl5(g) ⇌ PCl3(g) + Cl2(g)
ii)N2(g) + 3H2(g) ⇌ 2N3(g)
13. Which one is the least abundant isotope of hydrogen. Mention it's two uses. [1+1]
14. Suggest your ideas to protect Ozone layer from its depletion. [2]
15. Give a balanced chemical reaction for the preparation of CO in the laboratory. Why is CO harmful gas? [1+1]
16. Write down the molecular formula and use of each of the followings: [1+1]
i) Boric acid     ii) Orthophosphoric acid
17. What is meant by Slag? Write an example of it. [2]
18. What happens when  [1+1]
i) Bleaching powder is treated with dil. H2SO4
ii) Gypsom salt is heated above 130°C.
19. Write down IUPAC name of the following organic compounds. [1+1]
i) CH3 - O - CH2 - CH2 - OCH3     ii) CHCL3
20. Write reactions for the preparation of Methane from [1+1]
i) CH3MgBr     ii) CH3COONa
21. Identify the major product Ⓐ and Ⓑ in the following reaction sequence.
Reaction Sequence
22. Give functional isomers of ethanoic acid and propanone with their structural formula. [1+1] 
Group 'B'

Attempt any five questions. [5x5=25]

23. What are the observations of Rutherford's α-ray scattering experiment. Write down the conclusions drawn from it about the structure of an atom. [2.5+2.5]

24. Give an example to show oxidation and reduction go simultaneously. Balance the following equation by oxidation number or ion electron method. [2+3=5]
HNO3 + H2→ SO2 + NO2 + H2O

25. How would you detect the presence of nitrogen in organic compound by Lassiangne test method. [5]

26. Deduce the relationship between molecular mass and vapour density of a gas using Avogadro's hypothesis.  [3+2]
An Oxide of nitrogen contains half of its own volume of nitrogen and has vapour density equal to 15. Determine molecular formula of the nitrogen oxide.

27. Why can't HBr prepared by using NaBr and Conc. H2SO4? Give a balanced chemical reaction for the preparation of HCL. How would you test presence of Clor Brions in its aqueous solution? [2+1+2]

28. Describe the Kipp's apparatus method for the manufacture of H2S. Give a reaction to show H2S is a reducing agent. [4+1]

29. Write short notes on: [2.5+2.5]
i) Hydrometallurgy
ii) Zone of refining.

Group 'C'

Attempt any two questions: [2x10=20]

30. How is ammonia manufactured by Haber's process? What happens when ammonia is passed through
i) Copper sulphate solution
ii) heated copper oxide.
Give reactions for the conversion of ammonia to nitric acid. [6+2+2]

31. Write the principle and process along with self-explanatory diagram for the manufacture of sodium by Down's method. Why is sodium fire at laboratory not extinguished by adding water? Mention any two advantages of Down's process. How is Sodium converted into washing soda. [6+1+1+2]

32. State Boyle's Law and Charle's Law. Derive the relation Pv=nRT. An evacuated glass vessel weighs 50 gm when empty, 148 gm when filled with a liquid of density 0.98 gm/ml, and 50.5 gm when filled with an ideal gas at 760 mmHg at 27°C. Determine the molecular mass of the gas. How many number of molecules are present in 12.3 gm in the gas? [2+4+3+1]

33. Write short notes on any two. [2x5=10]

i) Characteristics of homologous series.
ii) Laboratory preparation of ethyne.
iii) Mendeleev's periodic tables and it's anomalies.
iv) Law of mass action and equilibrium constant.

View Chemistry Question Paper of 2074/2017 NEB:
Chemistry Exam Paper 2074-2017 NEB

Chemistry Exam Paper 2074-2017 NEB

Chemistry Exam Paper 2074-2017 NEB

Chemistry Exam Paper 2074-2017 NEB

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