Advertisement Remove all ads

Chemistry Shaalaa.com Model Set 3 2020-2021 HSC Science (General) 12th Board Exam Question Paper Solution

Advertisement Remove all ads
Chemistry [Shaalaa.com Model Set 3]
Marks: 70 Academic Year: 2020-2021
Date: April 2021
Duration: 3h
Advertisement Remove all ads
  1. The question paper is divided into four sections.
  2. Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each.
  3. Section A: Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
  4. Section B: Q. No. 3 to Q. No. 14 contains Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
  5. Section C: Q. No.15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
  6. Section D: Q.No. 27 to Q. No. 31 contains Five long answer type of questions carrying Four marks each. (Attempt any Three).
  7. Use of log table is allowed. Use of calculator is not allowed.
  8. Figures to the right indicate full marks.
  9. For each MCQ, correct answer must be written along with its alphabet.
    e.g., (a) ..... / (b ) .... / ( c ) .... / ( d) ..... Only first attempt will be considered for evaluation.
  10. Draw well labeled diagrams and write balanced equations wherever necessary.
  11. Given data:
    Atomic mass of C = 12, H = 1, O = 16
    Atomic number (Z): Mn = 25, Fe = 26, Ce = 58, Ar = 18,
    R = 8.314 J K-1 mol-1 or 0.083 L bar K-1 mol-1

Section A
[10] 1 | Select and write the correct answer:
[1] 1.i

The strongest base amongst the following is

Methanamine

N-Methylmethanamine

N-Methylaniline

N,N-Dimethylmethanamine

Concept: Basicity of Amines
Chapter: [0.13] Amines
[1] 1.ii

The following types of solids contain molecules as constituent particles?

molecular solids

Ionic solids

metallic solids

covalent network solids

Concept: Types of Solids
Chapter: [0.01] Solid State
[1] 1.iii

The units of Henry’s law constant are ______.

bar dm3 mol–1

mol L–1 bar–1

L mol–1 bar–1

bar L–1 mol–1

Concept: Solubility
Chapter: [0.02] Solutions
[1] 1.iv

Effect of catalyst in a chemical reaction is to change the _______.

activation energy

equilibrium concentration

final products

heat of a reaction

Concept: Collision Theory of Bimolecular Reactions
Chapter: [0.06] Chemical Kinetics
[1] 1.v

The reagents used to convert phenol to 2,4,6-tribromophenol is _____________

Br2/CS2

Br2/CCl4

Br2/H2O

KBr aq.

Concept: Alcohols and Phenols
Chapter: [0.11] Alcohols, Phenols and Ethers
[1] 1.vi

Write oxidation number of iron in [Fe(CO)5]

Concept: Terms Used in Coordination Chemistry
Chapter: [0.09] Coordination Compounds
[1] 1.vii

The type of mono halogen derivative in which a halogen atom is bonded to sp3 hybridized carbon atom next to carbon-carbon double bond is ______________

alkyl halide

allylic halide

vinylic halide

benzylic halide

Concept: Classification of Halogen Derivatives
Chapter: [0.1] Halogen Derivatives
[1] 1.viii

The following pair of elements has half-filled d-orbitals.

Chromium and cobalt

Manganese and nickel

Chromium and manganese

Cobalt and nickel

Concept: Electronic Configuration of Transition and Inner Transition Elements
Chapter: [0.08] Transition and Inner Transition Elements
[1] 1.ix

The following reactants CANNOT be converted into carboxylic acid?

Dry ice

Cyclohexane

Toluene

Cyclohexene

Concept: Nomenclature of Aldehydes, Ketones and Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[1] 1.x

The Henry’s law constant of a gas is 6.7 × 10–4 mol/(L bar). Its solubility when the partial pressure of the gas at 298 K is 0.65 bar is ______.

4.355 × 10–4 mol/L

4.355 × 10–2 mol/L

2.225 × 10–6 mol/L

2.225 × 10–2 mol/L

Concept: Solubility
Chapter: [0.02] Solutions
[8] 2 | Answer the following:
[1] 2.i

Arrange the following compounds in increasing order of their boiling points.

Ethyl alcohol, Ethyl amine, Ethanoic acid, Ethane

Concept: Physical Properties of Amines
Chapter: [0.13] Amines [13.01] Amines
[1] 2.ii

State Raoult’s law.

Concept: Vapour Pressure of Solutions of Liquids in Liquids
Chapter: [0.02] Solutions
[1] 2.iii

Write the IUPAC name of [Fe(CN)6]4– ion.

Concept: IUPAC Nomenclature of Coordination Compounds
Chapter: [0.09] Coordination Compounds
[1] 2.iv

Name the reagent used to convert alkyl halide to ester.

Concept: Methods of Preparation of Alkyl Halides
Chapter: [0.1] Halogen Derivatives
[1] 2.v

Name the solution which is formed by passing sulfur dioxide in water.

Concept: Oxygen and Compounds of Oxygen
Chapter: [0.07] Elements of Groups 16, 17 and 18
Advertisement Remove all ads
[1] 2.vi

Write the number of products when a mixture of ethanal and propanal is reacted with dilute alkali?

Concept: Nomenclature of Aldehydes, Ketones and Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[1] 2.vii

Draw the structure of α-D glucopyranose.

Concept: Biomolecules in the Cell - Carbohydrates
Chapter: [0.14] Biomolecules
[1] 2.viii

If the total volume of a simple cubic unit cell is 6.817 × 10-23 cm3, what is the volume occupied by particles in unit cell?

Concept: Cubic System
Chapter: [0.01] Solid State
Section B
[2] 3 | Attempt any Eight:

Answer the following

Define the following term: Nanochemistry

Concept: Introduction to Nanochemistry
Chapter: [0.16] Green Chemistry and Nanochemistry
[2] 4

Answer the following

Write the formula to calculate the % atom economy.

Concept: Principles of Green Chemistry
Chapter: [0.16] Green Chemistry and Nanochemistry
[2] 5

Explain the basic nature of amines with a suitable example.

Concept: Basicity of Amines
Chapter: [0.13] Amines
[2] 6

Write the reactions involved in the preparation of phenol from benzene sulfonic acid.

Concept: Alcohols and Phenols
Chapter: [0.11] Alcohols, Phenols and Ethers
[2] 7

What is cell constant? Write its SI unit.

Concept: Electric Conduction
Chapter: [0.05] Electrochemistry
[2] 8

Derive the relationship between standard cell potential and equilibrium constant of cell reaction.

Concept: Thermodynamics of Galvanic Cells
Chapter: [0.05] Electrochemistry
[2] 9

Write four postulates of Werner’s theory.

Concept: Terms Used in Coordination Chemistry
Chapter: [0.09] Coordination Compounds
[2] 10

Explain primary benzylic halide shows higher reactivity by SN1 mechanism than other primary alkyl halide.

Concept: Chemical Properties
Chapter: [0.1] Halogen Derivatives
[2] 11

Write the features of reversible processes.

Concept: Terms Used in Thermodynamics
Chapter: [0.04] Chemical Thermodynamics
[2] 12

What is the action of following on proponal?

Hydroxyl amine

Concept: Chemical Properties of Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids

What is the action of following on proponal?

Hydrazine

Concept: Chemical Properties of Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[2] 13

For the reaction 2NOBr → 2NO2 + Br2, the rate law is rate = k[NOBr]2. If the rate of a reaction is 6.5 × 10–6 mol L–1 s–1, when the concentration of NOBr is 2 × 10–3 mol L–1. What would be the rate constant of the reaction?

Concept: Integrated Rate Law
Chapter: [0.06] Chemical Kinetics
[2] 14

The solubility product of BaCl2 is 4.0 × 10-8. What will be its molar solubility in mol dm-3?

Concept: Solubility Product - Solubility product
Chapter: [0.03] Ionic Equilibria
Section C
[3] 15 | Attempt any Eight:

Define α-amino acids.

Concept: Biomolecules in the Cell - Proteins
Chapter: [0.14] Biomolecules
[3] 16

Derive the expression for molar mass of solute in terms of boiling point elevation of solvent.

Concept: Relative Molecular Mass of Non-volatile Substances - Boiling Point Elevation
Chapter: [0.02] Solutions
Advertisement Remove all ads
[3] 17

For the reaction 2A + B → C, rate of disappearance of A 0.076 mol s –1.

  1. What is the rate of formation of C?
  2. What is the rate of consumption of B?
  3. What is the rate of the overall reaction?
Concept: Rate of Reaction and Reactant Concentration
Chapter: [0.06] Chemical Kinetics
[3] 18

How will you bring about the following conversions?

isopropyl alcohol to acetone

Concept: Alcohols and Phenols
Chapter: [0.11] Alcohols, Phenols and Ethers

How will you bring about the following conversions?

2-methyl propan-2-ol to 2-methylpropene

Concept: Alcohols and Phenols
Chapter: [0.11] Alcohols, Phenols and Ethers

How will you bring about the following conversions?

acetone to 2-methylpropan-2-ol

Concept: Alcohols and Phenols
Chapter: [0.11] Alcohols, Phenols and Ethers
[3] 19

Draw a neat and well labelled diagram of Standard Hydrogen Electrode. Also write its one application.

Concept: Reference Electrodes
Chapter: [0.05] Electrochemistry
[3] 20

Answer the following question.

What are the types of ligands? Give one example of each type.

Concept: Types of Ligands
Chapter: [0.09] Coordination Compounds
[3] 21

How are the following conversions carried out?

propene to 1-iodopropane

Concept: Uses and Environmental Effects of Some Polyhalogen Compounds
Chapter: [0.1] Halogen Derivatives

How are the following conversions carried out?

propene to 2-nitropropane

Concept: Uses and Environmental Effects of Some Polyhalogen Compounds
Chapter: [0.1] Halogen Derivatives

How are the following conversions carried out?

benzene to biphenyl

Concept: Uses and Environmental Effects of Some Polyhalogen Compounds
Chapter: [0.1] Halogen Derivatives
[3] 22

Define the Enthalpy of vaporization.

Concept: Enthalpies of Physical Transformations
Chapter: [0.04] Chemical Thermodynamics

Define the Standard enthalpy of combustion.

Concept: Thermochemistry
Chapter: [0.04] Chemical Thermodynamics

Why work done in vacuum is zero?

Concept: Enthalpies of Physical Transformations
Chapter: [0.04] Chemical Thermodynamics
[3] 23

Write three physical properties of sulfuric acid.

Concept: Oxoacids
Chapter: [0.07] Elements of Groups 16, 17 and 18
[3] 24

Answer the following

Give the similarities and differences in elements of 3d, 4d, and 5d series.

Concept: Common Properties of d Block Elements
Chapter: [0.08] Transition and Inner Transition Elements
[3] 25

A substance crystallizes in fcc structure. The unit cell edge length is 367.8 pm. Calculate the molar mass of the substance if its density is 21.5 g/cm3.

Concept: Packing Efficiency
Chapter: [0.01] Solid State
[3] 26

Three moles of an ideal gas are expanded isothermally from 15 dm3 to 20 dm3 at a constant external pressure of 1.2 bar, calculate the amount of work in Joules.

Concept: Expression for Pressure-volume (PV) Work
Chapter: [0.04] Chemical Thermodynamics
Section D
[4] 27 | Attempt any Three:
[2] 27.i

Distinguish between strong electrolyte and weak electrolyte.

Concept: Types of Electrolyte
Chapter: [0.03] Ionic Equilibria
[2] 27.ii

Derive the equation pH + pOH = 14.

Concept: The pH Scale
Chapter: [0.03] Ionic Equilibria
[4] 28

What happens when chlorine reacts with?

Al

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements

What happens when chlorine reacts with?

Na

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements

What happens when chlorine reacts with?

S8

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements

What happens when chlorine reacts with?

P4

Concept: P - Block Group 17 Elements - Chlorine
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
[4] 29

Write two applications of lanthanoids.

Concept: Applications of Lanthanoids
Chapter: [0.08] Transition and Inner Transition Elements

Write two applications of actinoids.

Concept: Applications of Actinoids
Chapter: [0.08] Transition and Inner Transition Elements
[4] 30

Draw structure of salicylaldehyde.

Concept: Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones

Write reaction for preparation of acetophenone from benzoyl chloride.

Concept: Chemical Properties of Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids

Explain the acidic nature of carboxylic acids.

Concept: Chemical Properties of Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[4] 31

Explain the reactions involved in the preparation of viscose rayon.

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
Advertisement Remove all ads

Request Question Paper

If you dont find a question paper, kindly write to us





      View All Requests

Submit Question Paper

Help us maintain new question papers on Shaalaa.com, so we can continue to help students




only jpg, png and pdf files

Maharashtra State Board previous year question papers 12th Board Exam Chemistry with solutions 2020 - 2021

     Maharashtra State Board 12th Board Exam Chemistry question paper solution is key to score more marks in final exams. Students who have used our past year paper solution have significantly improved in speed and boosted their confidence to solve any question in the examination. Our Maharashtra State Board 12th Board Exam Chemistry question paper 2021 serve as a catalyst to prepare for your Chemistry board examination.
     Previous year Question paper for Maharashtra State Board 12th Board Exam Chemistry-2021 is solved by experts. Solved question papers gives you the chance to check yourself after your mock test.
     By referring the question paper Solutions for Chemistry, you can scale your preparation level and work on your weak areas. It will also help the candidates in developing the time-management skills. Practice makes perfect, and there is no better way to practice than to attempt previous year question paper solutions of Maharashtra State Board 12th Board Exam.

How Maharashtra State Board 12th Board Exam Question Paper solutions Help Students ?
• Question paper solutions for Chemistry will helps students to prepare for exam.
• Question paper with answer will boost students confidence in exam time and also give you an idea About the important questions and topics to be prepared for the board exam.
• For finding solution of question papers no need to refer so multiple sources like textbook or guides.
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×