Chemistry | Grade XI | Upgrading/Supplementary Examination Paper 2074 [2018] | NEB

NATIONAL EXAMINATIONS BOARD [NEB]
Chemistry Upgrading (Supplementary) - Grade XI
Examination - 2074 (2018)
Regular Students | Subject Code: 112
Time - 3 hrs
Full Marks - 75
Pass Marks - 27
DOWNLOAD PDF | of Exam Paper | Chemistry Upgrading (Supplementary) | Grade XI | 2074 [2018] 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 moles of CO will be left when 2x1021 molecules are removed from 0.28gm of CO? [2]
2. How does Dalton's atomic theory explain the law of conservation of mass. [2]
3. Define surface tension and writes it unit. [1+1]
4. Differentiate between Crystalline solid and Amorphous with an example of each. [2]
5. Name the quantum number that specifies the energy of an electron in an atom. What designation is given to an orbital having n=3 and ℓ=2.[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 nuclear fission reaction? Write an example of it. [1+1]
8. Write down the Lewis structure of  [1+1]
i) N2S2O3     ii) O3
9. H2O gets angular structure whereas CO2 gets linear. Why? [2]
10. Which ion would you expect to have smaller size and why? [1+1]
       Mg++ or Na+
11. Calculate the oxidation number of [1+1]
i) C in HCOONa
ii) Cl in KClO
12. What is the effect of increase of pressure and decrease of temperature in the following chemical equilibrium? [1+1]
i) 2SO2(g) + O2(g)⇌ 2SO3(g) + heat
13. Which one is more stable and why Ortho Hydrogen or Para Hydrogen. [1+1]
14. How are chlorofluorocarbon responsible for the depletion of ozone layer? [2]
15. What is meant by allotropy? Name the hardest allotrope of carbon and it's use. [1+1]
16. Give a balanced chemical reaction for the preparation of PH3 in the laboratory when it is treated with O2. [1+1]
17. Define the terms: Gangue and Slag, giving proper example of each. [2]
18. What happens when: [1+1]
i) Gypsum salt is heated at 1200C
ii) Chlorine gas is passed through slaked lime.
19. Write down IUPAC name of the following organic compounds. [1+1]
20. Write an example of each of the followings: [1+1]
i) Bayer's test,     ii) Wurtz reaction
21. Identify the major products Ⓐ and Ⓑ in the following reaction sequence.  
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Upgrading/Supplementary Chemistry Question Paper 2074-2018 NEB

Upgrading/Supplementary Chemistry Question Paper 2074-2018 NEB

Upgrading/Supplementary Chemistry Question Paper 2074-2018 NEB



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