Chemistry Official 2022-2023 HSC Science (General) 12th Standard Board Exam Question Paper Solution

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Chemistry [Official]
Marks: 70 Maharashtra State Board
HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)

Academic Year: 2022-2023
Date & Time: 1st March 2023, 11:00 am
Duration: 3h
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General instructions :

The question paper is divided into four sections :

  1. Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each. Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
  2. Section B: Q. No. 3 to Q. No. 14 contain Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
  3. Section C: Q. No. 15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
  4. Section D: Q. No. 27 to Q. No. 31 contain Five long answer type of questions carrying Four marks each. (Attempt any Three).
  5. Use of the log table is allowed. Use of calculator is not allowed.
  6. Figures to the right indicate full marks.
  7. For each multiple-choice type of question, it is mandatory to write the correct answer along with its alphabet. e.g., (a)......../(b)......../(c)......./(d)........
    No marks(s) shall be given if ONLY the correct answer or the alphabet of the correct answer is written. Only the first attempt will be considered for evaluation.
    Given:
    R = 8.314 J.K–1. mol–1
    NA = 6.022 × 1023
    F = 96500C

SECTION - A
[10]1 | Select and write the correct answer for the following multiple choice type of questions :
[1]1.i

The relation between the radius of the sphere and the edge length in the body-centred cubic lattice is given by the formula ______.

`sqrt(3)r` = 4a

r = `sqrt(3)/a xx 4`

r = `sqrt(3)/4a`

r = `sqrt(2)/4 xx a`

Concept: Packing Efficiency
Chapter: [0.01] Solid State
[1]1.ii

The pH of a weak monoacidic base is 11.2, and its OH ion concentration is ______.

1.585 × 10–3 mol dm–3

3.010 × 10–11 mol dm–3

3.010 × 10–3 mol dm–3

1.585 × 10–11 mol dm–3

Concept: The pH Scale
Chapter: [0.03] Ionic Equilibria
[1]1.iii

Which of the following correctly represents integrated rate law equation for a first order reaction in a gas phase?

k = `2.303/t xx log_10  P_i/(P_i - P)`

k = `2.303/t xx log_10  P_i/(2P_i - P)`

k = `2.303/t xx log_10  (2P_i)/(P_i - P)`

k = `2.303/t xx log_10  (P_i - P)/(2P_i)`

Concept: Integrated Rate Equations
Chapter: [0.06] Chemical Kinetics
[1]1.iv

The spin only magnetic moment of Mn2+ ion is ______.

4.901 BM

5.916 BM

3.873 BM

2.846 BM

Concept: Trends in Atomic Properties of the First Transition Series
Chapter: [0.08] Transition and Inner Transition Elements
[1]1.v

The correct formula of a complex having IUPAC name Tetraamminedibromoplatinum (IV) bromide is ______.

[Pt Br (NH3)4] Br2

[Pt Br2 (NH3)4] Br

[Pt Br2 (NH3)4] Br2

[Pt Br (NH3)4] Br

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

The allylic halide, among the following, is ______.

\[\begin{array}{cc}
\phantom{}\ce{R - CH - R}\phantom{}\\
|\phantom{..}\\
\ce{X}\phantom{..}
\end{array}\]

CH2 = CH – X

CH2 = CH – CH2 – X

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

The product of following reaction is

\[\ce{CH3 - CH = CH - CH2 - CHO ->[i) LiAlH4][ii) H3O+]}\] ______?

CH3 – CH2 – CH2 – CH2 – CH2 – OH

CH3 – CH = CH – CH2 – CH2 – OH

CH3 – CH2 – CH2 – CH2 – COOH

CH3 – CH = CH – CH2 – COOH

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Chapter: [12.01] Aldehydes and Ketones
[1]1.viii

Ozonolysis of 2, 3 dimethyl but-2-ene, followed by decomposition by Zn dust and water gives ______.

acetaldehyde

propionaldehyde and acetone

acetone

acetaldehyde and butyraldehyde

Concept: Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
[1]1.ix

The glycosidic linkage present in maltose is ______.

α, β-1, 2-glycosidic linkage

α-1, 4-glycosidic linkage

β-1, 4-glycosidic linkage

α-1, 6-glycosidic linkage

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

The monomer of natural rubber is ______.

Isoprene

Acrylonitrile

ε-Caprolactam

Tetrafluoroethylene

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
[8]2 | Answer the following questions :
[1]2.i

Write the name of the technique used to know geometry of nanoparticles.

Concept: Synthesis of Nanomaterials
Chapter: [0.16] Green Chemistry and Nanochemistry
[1]2.ii

Write the name of the product formed by the action of LiAlH4/ether on acetamide.

Concept: Amines - Preparation of Amines
Chapter: [0.13] Amines [13.01] Amines
[1]2.iii

Write the structure of the product formed when chlorobenzene is treated with sodium metal in the presence of dry ether.

Concept: Reaction with Active Metals
Chapter: [0.1] Halogen Derivatives
[1]2.iv

Write the chemical composition of cryolite.

Concept: Occurrence of Elements of Groups 16, 17 and 18
Chapter: [0.07] Elements of Groups 16, 17 and 18
[1]2.v

Write the name of platinum complex used in the treatment of cancer.

Concept: Applications of Coordination Compounds
Chapter: [0.09] Coordination Compounds
[1]2.vi

Write the SI unit of the cryoscopic constant.

Concept: Relative Molecular Mass of Non-volatile Substances - Depression in Freezing Point
Chapter: [0.02] Solutions
[1]2.vii

Write the correct condition for spontaneity in terms of Gibbs energy.

Concept: Spontaneous (Irreversible) Process
Chapter: [0.04] Chemical Thermodynamics
[1]2.viii

Calculate molar conductivity for 0.5 M BaCl2 if its conductivity at 298K is 0.01 Ω–1 cm–1.

Concept: Electrical Conductance of Solution
Chapter: [0.05] Electrochemistry
SECTION - B : 16 Marks
[2]3 | Attempt any EIGHT of the following questions :

Distinguish between lanthanoid and actinoids.

Concept: F-block Elements - The Actinoids
Chapter: [0.08] Transition and Inner Transition Elements [8.02] F-block Elements
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[2]4

Calculate the mole fraction of solute, if the vapour pressure of pure benzene at a certain temperature is 640 mmHg and the vapour pressure of a solution of a solute in benzene is 600 mmHg.

Concept: Vapour Pressure Lowering
Chapter: [0.02] Solutions
[2]5

Define Green chemistry.

Concept: Green Chemistry and Nanochemistry
Chapter: [0.16] Green Chemistry and Nanochemistry

Write any three advantages of nanoparticles and nanotechnology.

Concept: Nanoparticles and Nanotechnology
Chapter: [0.16] Green Chemistry and Nanochemistry
[2]6
[1]6.i

Explain the following term:

Substitutional impurity defect

Concept: Crystal Defects or Imperfections
Chapter: [0.01] Solid State
[1]6.ii

Explain the following term:

Interstitial impurity defect

Concept: Crystal Defects or Imperfections
Chapter: [0.01] Solid State
[2]7
[1]7.i

Write the chemical reaction for the following:

Chlorobenzene is heated with fuming H2SO4.

Concept: Reaction with Active Metals
Chapter: [0.1] Halogen Derivatives
[1]7.ii

What is the action of the following on ethyl bromide:
silver acetate

Concept: Hydrocarbons: Alkanes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Chapter: [10.01] Haloalkanes
[2]8

Define Acidic buffer solution.

Concept: Buffer Solutions
Chapter: [0.03] Ionic Equilibria

Write the relationship between solubility and solubility product for PbI2.

Concept: Solubility Product - Solubility product
Chapter: [0.03] Ionic Equilibria
[2]9
[1]9.i

What is the action of the following reagents on ethyl amine?

Chloroform and caustic potash

Concept: Amines - Chemical Reactions of Amines - Carbylamine Reaction
Chapter: [13.01] Amines
[1]9.ii

What is the action of the following reagents on ethyl amine?

Nitrous acid

Concept: Amines - Chemical Reactions of Amines - Reaction with Nitrous Acid
Chapter: [13.01] Amines
[2]10

Calculate standard Gibbs energy change at 25°C for the cell reaction.

\[\ce{Cd_{(s)} + Sn^{2+}_{ (aq)} -> Cd^{2+}_{ (aq)} + Sn_{(s)}}\]

\[\ce{E^0_{cd}}\] = –0.403 V, \[\ce{E^0_{Sn}}\] = –0.136 V

Concept: Thermodynamics of Galvanic Cells
Chapter: [0.05] Electrochemistry
[2]11

Explain the preparation of glucose from sucrose

Concept: Biomolecules in the Cell - Carbohydrates
Chapter: [0.14] Biomolecules

Write the structure of D-ribose.

Concept: Biomolecules in the Cell - Nucleic Acids
Chapter: [0.14] Biomolecules
[2]12

Define the Extensive properties.

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

Calculate the work done during the expansion of 2 moles of an ideal gas from 10 dm3 to 20 dm3 at 298 K in a vacuum.

Concept: Expression for Pressure-volume (PV) Work
Chapter: [0.04] Chemical Thermodynamics
[2]13

Write the preparation of nylon 6, 6.

Concept: Classification of Polymers
Chapter: [0.15] Introduction to Polymer Chemistry
[2]14
[1]14.i

Draw the structure of chloric acid.

Concept: Oxoacids
Chapter: [0.07] Elements of Groups 16, 17 and 18
[1]14.ii

Draw the structure of the following compound:

Peroxy disulphuric acid

Concept: Oxoacids
Chapter: [0.07] Elements of Groups 16, 17 and 18
SECTION - C : 24 Marks
[3]15 | Attempt any EIGHT of the following questions :

Explain the term osmosis.

Concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions

How will you determine the molar mass of non-volatile solute by elevation of boiling point?

Concept: Relative Molecular Mass of Non-volatile Substances - Boiling Point Elevation
Chapter: [0.02] Solutions
[3]16
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[1]16.i

Convert the following:

Ethyl alcohol into ethyl acetate

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [0.11] Alcohols, Phenols and Ethers [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[1]16.ii

How is phenol converted into the following?

benzene

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [0.11] Alcohols, Phenols and Ethers [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[1]16.iii

How will you obtain the following? (Give balanced equation.)

Ethyl chloride from diethyl ether.

Concept: Ethers - Physical and Chemical Properties of ether
Chapter: [11.03] Ethers
[3]17

A weak monobasic acid is 10% dissociated in 0.05 M solution. What is the percent dissociation in 0.15 M solution?

Concept: Types of Electrolyte
Chapter: [0.03] Ionic Equilibria
[3]18

Explain the dehydrohalogenation reaction of 2-chlorobutane.

Concept: Chemical Properties
Chapter: [0.1] Halogen Derivatives

Write use of CFC.

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

Write environmental effect of CFC.

Concept: Uses and Environmental Effects of Some Polyhalogen Compounds
Chapter: [0.1] Halogen Derivatives
[3]19

2000 mmol of an ideal gas expanded isothermally and reversibly from 20 L to 30 L at 300 K, calculate the work done in the process (R = 8.314 JK–1 mol–1).

Concept: Concept of Maximum Work
Chapter: [0.04] Chemical Thermodynamics
[3]20

What are interstitial compounds?

Concept: Trends in Atomic Properties of the First Transition Series
Chapter: [0.08] Transition and Inner Transition Elements

Give the classification of alloys with examples.

Concept: Trends in Atomic Properties of the First Transition Series
Chapter: [0.08] Transition and Inner Transition Elements
[3]21

Draw labelled diagram of H2 – O2 fuel cell.

Concept: Fuel Cells
Chapter: [0.05] Electrochemistry

Write two applications of fuel cells.

Concept: Fuel Cells
Chapter: [0.05] Electrochemistry
[3]22

Explain the formation of [CoF6] complex with respect to

  1. Hybridisation
  2. Magnetic properties
  3. Inner/outer complex
  4. Geometry
Concept: Theories of Bonding in Complexes
Chapter: [0.09] Coordination Compounds
[3]23

Explain pseudo-first-order reaction with an example.

Concept: Pseudo First Order Reaction
Chapter: [0.06] Chemical Kinetics

Derive integrated rate law for a zero-order reaction \[\ce{A -> Product}\].

Concept: Zero Order Reactions
Chapter: [0.06] Chemical Kinetics
[3]24

Explain Aldol condensation of ethanal.

Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Reactions Due to α-hydrogen
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[3]25

Explain anomalous behaviour of oxygen in group 16 with respect to:

  1. Atomicity
  2. Magnetic property
  3. Oxidation state
Concept: P - Block Group 16 Elements - Anomalous Behaviour of Oxygen
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.02] Group 16 Elements
[3]26
[1]26.i

How will you prepare acetic anhydride from acetic acid?

Concept: Chemical Properties of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[1]26.ii

Write chemical reactions for the following conversion:

Acetic acid into ethyl alcohol

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [0.11] Alcohols, Phenols and Ethers [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[0.5]26.ii.1

Write the IUPAC name of methylphenylamine.

Concept: Nomenclature of Amines
Chapter: [0.13] Amines
[0.5]26.ii.2

Write the structure of methylphenylamine.

Concept: Nomenclature of Amines
Chapter: [0.13] Amines
SECTION - D : 12 Marks
[4]27 | Attempt any THREE of the following questions :

Solve

Show that the time required for 99.9% completion of a first-order reaction is three times the time required for 90% completion.

Concept: First Order Reactions
Chapter: [0.06] Chemical Kinetics

Give the electronic configuration of gadolinium (Z = 64).

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

Answer the following

Which nanomaterial is used for tyres of the car to increase the life of tyres?

Concept: History of Nanotechnology
Chapter: [0.16] Green Chemistry and Nanochemistry
[4]28

Obtain the relationship between ΔH and ΔU for gas phase reactions.

Concept: Enthalpy (H)
Chapter: [0.04] Chemical Thermodynamics

Answer the following in one sentence.

Define the term: Vulcanization

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry

Define peptide bond.

Concept: Biomolecules in the Cell - Proteins
Chapter: [0.14] Biomolecules
[4]29

Silver crystallizes in the fcc structure. If the edge length of the unit cell is 400 pm, calculate the density of silver (Atomic mass of Ag = 108).

Concept: Cubic System
Chapter: [0.01] Solid State

Explain haloform reaction with suitable example.

Concept: Chemical Properties of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[4]30

Define Distereoisomers.

Concept: Isomerism in Coordination Compounds
Chapter: [0.09] Coordination Compounds

Give cis isomer of [Co(NH3)4Cl2].

Concept: Isomerism in Coordination Compounds
Chapter: [0.09] Coordination Compounds

Give trans isomer of [Co(NH3)4Cl2].

Concept: Isomerism in Coordination Compounds
Chapter: [0.09] Coordination Compounds

Define Reference electrode

Concept: Reference Electrodes
Chapter: [0.05] Electrochemistry

Give reason:

Bleaching action of ozone is also called dry bleach.

Concept: Oxygen and Compounds of Oxygen
Chapter: [0.07] Elements of Groups 16, 17 and 18
[4]31

Write Dow process for the preparation of Phenol.

Concept: Phenols - Methods of Preparation
Chapter: [11.02] Phenols

What is the action of bromine water on carbolic acid?

Concept: Phenols - Methods of Preparation
Chapter: [11.02] Phenols

Elements of group 16 have lower ionization enthalpy values compared to those of group 15 elements. Explain why?

Concept: Atomic and Physical Properties of Elements of Group 16, 17 and 18
Chapter: [0.07] Elements of Groups 16, 17 and 18

Write two uses of dioxygen.

Concept: P - Block Group 16 Elements - Dioxygen
Chapter: [7.02] Group 16 Elements

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