Sub. code 3021
NEB — GRADE XII
2082 GIE Set B
Old Question
Class 12 Chemistry Old Question 2082 GIE Set B
The candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
Pass Marks : 32
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This old question paper is for Class 12 Chemistry, 2082 GIE Set B (subject code 3021), carrying full marks of 75 with a pass mark of 32, to be completed within 3 Hours. Model answers are available for questions that have one — reveal them with a free account (a few reveals) or a paid plan (unlimited).
Group A
Rewrite the correct answer of each option in your answer sheet
If x gram of CaCO₃ requires 20 mL of 2 N HCl for complete neutralization, what will be the value of x?
0.5 g
1 g
1.5 g
2 g
A plot of concentration versus time is given below. What order of reaction is represented by the curve?
Zero order reaction
First order reaction
Second order reaction
Pseudo order reaction
What will be the entropy change of the following reaction?
N₂(g) + 3H₂(g) → 2NH₃(g)
Given, S° for N₂(g), H₂(g) and NH₃(g) are +191.5, +130.6 and +192.5 J K⁻¹ mol⁻¹, respectively.
−132.1 J K⁻¹ mol⁻¹
−198.3 J K⁻¹ mol⁻¹
+129.6 J K⁻¹ mol⁻¹
−322.1 J K⁻¹ mol⁻¹
What is the appropriate cell reaction for the cell:
Zn/Zn²⁺ (1.0 M) / Cd²⁺ (1.0 M) / Cd?
Which of the following is the chief ore of mercury?
Calamine
Calomel
Haematite
Cinnabar
A heavy metal salt black-stains organic surfaces in the presence of sunlight. What compound is it?
AgBr
AgNO₃
HgCl₂
Hg₂Cl₂
An organic compound (X) reflux with alc. KCN gives benzoin. What is the compound (X)?
Chlorobenzene
Benzoic acid
Benzaldehyde
Nitrobenzene
Which of the following alcohols gives positive iodoform test?
CH₃OH
CH₃CH₂CH₂OH
CH₃CH₂OH
(CH₃)₃COH
A green or blue colour obtained by mixing phenol, sodium nitrite and conc. H₂SO₄ changes to red on dilution. If the beginning colour is regained on adding NaOH, what is the reaction called?
Iodoform test
Sodium nitrite test
Lucas test
Liebermann's test
In the above reaction sequence, the compound (A) is alkene with molecular formula C₃H₆. Identify the compound (C).
Ethoxy ethane
2-Methoxypropane
2-Ethoxypropane
Methoxyethane
What will be the final product if Grignard's reagent reacts with formaldehyde?
Primary alcohol
Secondary alcohol
Tertiary alcohol
Acetone
Group B
short answer question
When 4.5 g of a divalent metal was dissolved in 100 mL of 2 M H₂SO₄ (f = 1.01), the unreacted acid required 30 mL of 1 N NaOH for complete neutralization. What is the atomic mass of the metal?
State Hess's law of constant heat summation. If the enthalpy of formation of benzene, water and carbon dioxide are +55 kJ, −395 kJ and −285 kJ, respectively, calculate the enthalpy of combustion of benzene.
Write down the chemistry of blue vitriol.
Explain the construction and working of standard hydrogen electrode. What is the limitation of hydrogen electrode?
An alloy of iron containing 0.2 to 2% carbon and trace of other constituents is a popular construction material. Explain the manufacture of this material by open hearth process.
Give an example each of Saytzeff's rule and Wurtz reaction. What happens when chloroform is exposed in air? How can it be prevented? Write down any two uses of chloroform.
Write the principle and process involved in the fermentation to produce ethyl alcohol.
A sequence of reactions is given below:
(A) (B) (C) (D) (E)
If the compound D can be prepared by boiling benzene diazonium chloride with dil. H₂SO₄, identify A, B, C, D and E with their IUPAC names.
Write the reactions of CH₃CHO with HCN, NaHSO₃, NH₂OH, NH₂NH₂ and 2,4-DNP.
An amine with molecular formula C₄H₉N has three isomers. Name those isomers and explain the method of their separation by using Hoffmann's method.
Group C
long answer question
Define normality and molarity and derive the relation between them.
Explain the application of common ion effect and solubility product principle in qualitative salt analysis.
Derive and explain integrated rate equation and half-life for a first-order reaction. If a first-order reaction requires 100 minutes to transform 60% of the reactant into product, how much time will it take to transform 90% of the reactant into product?
You are given the following organic compounds:
A = C₂H₄O₂
B = C₂H₃OCl
C = C₂H₄O
D = C₂H₆O
E = C₂H₅Cl
Where, compound C is an aliphatic aldehyde which gives positive Tollen's test. Complete the following reaction sequence with suitable reagents and catalysts.
A → B → C → D → E
Convert nitrobenzene into cinnamic acid.
Formic acid behaves as both acid and aldehyde. Write reactions to support each kind of behaviour.
What is Grignard's reagent? How do you use Grignard's reagent to prepare primary, secondary and tertiary alcohols?
How do you convert methanoic acid into ethanoic acid?
Name any four components of cement and write a function of each of them.
Write down the advantages and disadvantages each of using pesticides.
How is the quality of produced paper improved?
Write down any two differences between nuclear fission and fusion reactions.
Paper Overview & Analysis
2082 GIE Set B
Year
Old Question
Type
75
Full Marks
32
Pass Marks
3 Hours
Duration
31
Question Items
Question Type Breakdown
Group Breakdown