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Today, we’re going to provide you NEB Class 12 Chemistry General Stream Exam Paper 2081-2024 with subject code – 3021Q which examination was held on the year 2081/2024 and you can download the neb grade xii (12) Chemistry General Stream subject exam question paper of the year 2081-2024 in PDF format which is only for the regular and grade increment general stream’s students whose first two digits of registration number starts from 78 , 79 and 80. Please check and download pdf file grade 12 Chemistry General Stream Exam question paper of the year 2024-2081 Nepal. The Exam Question provided below – NEB Class 12 Chemistry General Stream Exam Paper 2081-2024 for the board exam 2079 and onwards. And it is based on the latest NEB Syllabus for 2079 and so on. We will be adding more Exam Question Papers of grade xii- class 12 later on. Scroll down to Download NEB Class 12 Chemistry General Stream Exam Paper 2081-2024 Sub. Code: 3021Q in pdf format which is 2.15 mb in size. Enjoy!
NEB Class 12 Chemistry General Stream Exam Paper 2081-2024.
NATIONAL EXAMINATIONS BOARD [NEB]
Chemistry
Grade XII-Class 12
For Regular and Grade Increment General Stream Students
Examination – 2081 (2024)
(New Course)
Subject Code: 3021Q
F. Time – 3 hrs
Full Marks – 75
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(For the regular and grade increment general stream’s students whose first two digits of registration number starts from 78 , 79 and 80)
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
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Group – ‘A’
Question No. 1 to 11 (Multiple Choice Questions) will be provided after 30 minutes of starting examination. Rewrite its (MCQ) correct options (answer) in the same answer sheet.
Group – ‘B’ 8×5=40
12. An electrochemical cell (galvanic cell) is designed by coupling Zn-electrode with standard hydrogen electrode (SHE).
Given, EZn++/ Zn= – 0.76 V.
- Draw the galvanic cell. [2]
- Write down complete cell reaction. [2]
- Calculate the emf of the cell. [1]
Or
What is Hess’s law of constant heat summation ? Calculate the heat of formation of ethanol from the following data : [1+4]
H ( g ) + 1 O ( g ) → H O(l), H = –286.2 KJ / mol
C (s) + O2 ( g ) → CO2 ( g ), H = –393.2 KJ / mol
C2 H5OH(l) + 3O2 (g) → 2CO2 (g) + 3H2O(l), H = –1368 KJ / mol
13. Define the following terms.
i) Lewis base ii) Basic buffer [2]
Calculate the pH of solution obtained by mixing equal volumes of two solutions having pH =3 and pH= 5. [3]
14. A heavy metal is extracted from its oxide ore. During extraction, smelting of the calcined ore is done in a blast furnace.
a) Name the metal and the ore. [1]
b) Draw the clean and labelled diagram of the blast furnace showing different zones. [3]
c) Write down the balanced chemical equations of slag formation reactions. [1]
15. Write two methods of preparation of corrosive sublimate. Give its action with
a) excess of KI
b) NH3 [2+2+1]
16. i) Starting from nitrobenzene, how would you prepare aniline ? Convert aniline into :
a) phenyl isocyanide
b) azo-dye [1+2]
ii) Nitrobenzene prefers electrophilic substitution reaction at meta-position. Explain. [2]
17. A sequence of chemical reactions is represented as:
a) Identify the compounds (A) and (B). [1]
b) Write the laboratory test of compound (B). [1]
c) Starting from compound (B), how would you obtain nitrolic acid ? [2]
d) Predict the product when compound (A) is heated with chloroform in alcoholic medium. [1]
Or,
Make a correct sequence of reactions using suitable conditions and reagents of the following compounds.
Benzene, Benzaldehyde, Toluene, Cinnamic acid, Sodium benzoate, Benzoic acid.
18. Write a chemical equation for each of the following.
a) 2, 4- DNP test [1]
b) Oxo-process [1]
c) Claisen condensation reaction [1]
d) Wurtz-Fittig reaction [1]
e) Carboxylation reaction [1]
19. The chlorinated compound ‘A’ reacts with acetone to give sleep-inducing drug.
a) How would you prepare compound ‘A’ by using one of the isomers of C2H6O ? [2]
b) What happens when compound ‘A’ is:
i) Exposed in air ? [1]
ii) Heated with phenol in the presence of aq. NaOH ? [2]
Group – ‘C’ 3×8=24
20. a) Distinguish between pseudo first order and first order reaction giving an example of each. [2]
b) Draw an energy profile diagram showing energy of activation for endothermic reaction. [2]
c) The hypothetical data for the reaction, 2A+B→ C, are,
| Expt No. | [A] molL-1 | [B] molL-1 | [rate] formation of [C] molL-1Sec-1 |
| 1 | 0.1 | 0.1 | 6×10-3 |
| 2 | 0.3 | 0.2 | 7.2×10-2 |
| 3 | 0.3 | 0.4 | 2.88×10-1 |
| 4 | 0.4 | 0.1 | 2.40×10-2 |
Calculate the rate of formation of ‘C’ when the concentration of ‘A’ and ‘B’ are [0.6] molL-1 and (0.3) molL-1, respectively. [1+1+1+1]
Or
a) Deduce normality equation. [2]
b) Give reason.
i) Methyl orange is used as indicator for the titration between H2SO4 and Na2CO3. [1]
ii) Oxalic acid solution is warmed by adding dil.H2SO4 before titration with KMnO4. [1]
c) 0.70 g of a sample of Na2CO3.xH2O was dissolved in water and volume was made 100 ml. 20 ml of this solution required 19.8 ml of N/10 HCl for complete neutralization. Find the value of x. [4]
21. a) Give any two chemical reactions for the preparation of ethanoic acid. [2]
b) How does ethanoic acid react with [2]
i) P2O5 ii) NH3 ?
c) A carbonyl compound ‘A’ gives both Tollen’s and iodoform tests positively.
i) Identify the compound ‘A’. [1]
ii) How does the compound ‘A’ react with dil. NaOH ? Give chemical equation involved. [1]
iii) Write the chemical equation when compound ‘A’ reacts with HCN followed by hydrolysis. [2]
Or,
a) An aromatic compound (A) undergoes Sandmeyer’s reaction to give (B). The compound (B) is reduced with Ni-Al in presence of alkali to give compound (C). The compound (C) further reacts with CH3Cl in the presence of Anhydrous AlCl3.The compound (B) when heated with chloral in acidic medium gives a common insecticide. Identify (A), (B), (C) and (D) giving complete reaction. [4]
b) How do you separate the isomers of C H N by Hoffmann’s method? Explain with suitable chemical equations. [4]
22. a) Define homopolymer and co-polymer. [2]
b) Differentiate between paper and pulp. [2]
c) Distinguish between OPC and PPC cement. [2]
d) Write down any two uses of radioisotopes in medical field. [2]
NEB Class 12 Chemistry General Stream Exam Paper 2081-2024.
View and Download NEB Class 12 Chemistry General Stream Exam Paper 2081-2024 Code-3021Q – Images.
