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NEB Class 12 Chemistry Technical Stream Exam Paper 2081-2024

NEB Class 12 Chemistry Technical Stream Exam Paper 2081-2024

Hey people out there! Hope you all are doing great. Today, we’re going to provide you NEB Class 12 Chemistry Technical Stream Exam Paper 2081-2024 with subject code – 9111 which examination was held on the year 2081/2024 and you can download the neb grade xii (12) Chemistry Technical Stream subject exam question paper of the year 2081-2024 in PDF format which is only for the regular and grade increment students whose first two digits of registration number start from 79 and 80. Please check and download pdf file grade 12 Chemistry Technical Stream Exam question paper of the year 2024-2081 Nepal. The Exam Question provided below – NEB Class 12 Chemistry Technical 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 Technical Stream Exam Paper 2081-2024 Sub. Code: 9111 in pdf format which is 2.15 mb in size. Enjoy!

NEB Class 12 Chemistry Technical Stream Exam Paper 2081-2024.

NATIONAL EXAMINATIONS BOARD [NEB]
Chemistry

Grade XII-Class 12
For Regular and Grade Increment Students
Examination – 2081 (2024)
(New Course)
Subject Code: 9111
Time – 3 hrs
Full Marks – 75

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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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Attempt All the Questions:

Group – ‘A’ 11×1=11

Rewrite the correct options of each questions in your answer sheet.

1. In titration of dil. HCl versus standard Na CO solution, which of the following is the suitable indicator?

A) Methyl yellow 
B) Methyl orange
C) Phenolphthalein
D) Litmus

2. If the rate of reaction is independent of the initial concentration of the reactant, what order of reaction is it ?

A) Zero order reaction
B) First order reaction
C) Pseudo-first order reaction
D) Second order reaction

3. What is the nature of aqueous solution of CuSO4 ?

A) Alkaline
B) Neutral
C) Acidic
D) Depends on concentration

4. What is blister copper ?

A) An alloy of copper
B) Pure copper
C) Copper with 1-2% impurity
D) Ore of copper

5. A test tube contains heptahydrated zinc sulphate crystals. What are they commonly known as ?

A) Blue vitriol
B) White vitriol
C) Green vitriol
D) Oil of vitriol

6. Which of the following is the black oxide of copper ?

A) Cu(OH)2
B) CuFeS2
C) Cu2O
D) CuO

7. Which of the following groups of compounds is functional isomer of alcohol?

A) Ether
B) Ester
C) Carboxylic acid
D)Aldehyde

8. If benzene diazonium salt is warmed with water, what major product will it form ?

A) Acetone
B) Acetaldehyde
C) Phenol
D) Chlorobenzene

9. How do you define Tollen’s reagent ?

A) Alkaline CuSO4
B) Ammoniacal Silver nitrate
C) Alkaline KMnO4
D) Ammoniacal cuprous chloride

10. An alkyl halide ‘A’ reacts with Na in the presence of dry ether to form B. If the molecular formula of B is C4H10, what is A ?

A) CH3CH2CH2CH2Cl
B) CH3CH2CH2Cl
C) CH3Cl
D) CH3CH2Cl

11. Which of the following drugs is used to lower the body temperature during the high fever ?

A) Paracetamol
B) Novalgin
C) Penicillin
D) Diazepam

Group – ‘B’ 11×1=11

Short answer questions:  [8X5=40]

12. Normality and molarity are the common units of expressing the concentration of a solution.

a) Derive the relationship between normality and molarity. [2]
b) Calculate the resulting normality of a solution that is obtained by mixing 20mL of 0.8 M NaOH with 25 mL of 0.4M H2SO4 solution. [3]

13. Define common ion effect and solubility product principle. Describe three main applications of common ion effect and solubility product principle. [1+1+3]

14. What is meant by order of reaction ? Derive the expression for integrated rate equation of first order reaction.  [1+4]

15. Standard reduction potentials of Mg2+/Mg and Cu2+/Cu are -2.37V and +0.34V, respectively.

a) Write the Galvanic cell notation indicating anode and cathode.    [1]
b) Calculate the standard emf of the cell.   [2]
c) Write the complete cell reaction.   [2]

Or

Define enthalpy of combustion. If the heat of formation of ethyl alcohol, water and carbon dioxide are 64.1 kcal/mol-68.5 kcal/mol and -95.0 kcal/mol, respectively, calculate the heat of combustion of ethyl alcohol.

16. Water acts as both acid and base according to Bronsted-Lowry concept. Explain this fact with suitable reactions. Also show the conjugate acid and conjugate base pairs in each reaction. Write any one limitation of this concept of acid and base. [2+2+1]

Or

17. Explain the methods of preparation, properties and uses of white vitriol. [5]

18. Write down reactions to show the preparation of trichloromethane from ethanol. Write the actions of trichloromethane on:  [1+4]

a) Silver powder
b) Conc. HNO3
c) Propanone and
d) Aqueous KOH

19. An organic compound ‘A’ on ozonolysis gives a mixture of compounds B and C. Both B and C give positive DNP test. The molecular formula of B is C H O, which does not give Tollen’s test. However, C has the same molecular formula and gives Tollen’s test.

Identify the compounds A, B and C with their IUPAC names and relevant chemical reactions. [5]

Or

An organic compound has the molecular formula C H O. Write its functional isomers with their IUPAC names. Write reactions to show the preparation of monohydric alcohol from alkyl halides, primary amines and esters. [2+3]

NEB Class 12 Chemistry Technical Stream Exam Paper 2081-2024.

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