Chemistry Model set 1 by shaalaa.com 2023-2024 HSC Science (General) 12th Standard Board Exam Question Paper Solution

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Chemistry [Model set 1 by shaalaa.com]
Marks: 70 Maharashtra State Board
HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)

Academic Year: 2023-2024
Date: March 2024
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General Instructions: The question paper is divided into four sections. 

  1. Section A: Q.No.1 contains Ten multiple-choice types 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 are Twelve short answer type questions carrying Two marks each. (Attempt any Eight).
  3. Section C: Q.No.15 to Q.No.26 are Twelve short answer type questions carrying Three marks each. (Attempt any Eight).
  4.  Section D: Q.No.27 to Q.No.31 are Five Long answer-type questions carrying Four marks each. (Attempt any Three).
  5. Use of Log table is allowed. Use of calculator is not allowed.
  6. Figures to the right indicate full marks.
  7.  For each multiple-choice type question, it is mandatory to write the correct answer along with its alphabet. e.g., (a) .............. /(b) ............... /(c) ............... /(d) ................ ,etc. No mark(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. 

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

Select the most appropriate option.

A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 bar from an initial volume of 2.5 L to a final volume of 4.5 L. The change in internal energy, ΔU of the gas will be _______.

–500 J

+ 500 J

–1013 J

+ 1013 J

Concept: Chemical Thermodynamics
Chapter: [0.04] Chemical Thermodynamics
[1]1.ii

Choose the most correct option.

Formula for the compound sodium hexacynoferrate (III) is ____________.

[NaFe(CN)6]

Na2[Fe(CN)6]

Na[Fe(CN)6]

Na3[Fe(CN)6]

Concept: Coordination Compounds
Chapter: [0.09] Coordination Compounds
[1]1.iii

Polonium has the half-Life of ______.

13.8 days

12 days

5 days

102 days

Concept: Atomic and Physical Properties of Elements of Group 16, 17 and 18
Chapter: [0.07] Elements of Groups 16, 17 and 18
[1]1.iv

Choose the most correct option.

The oxidation state of cobalt ion in the complex [Co(NH3)5 Br]SO4 is __________.

+2

+3

+1

+4

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

Select the most correct choice.

CH2OH-CO-(CHOH)4 -CH2OH is an example of ______.

Aldohexose

Aldoheptose

Ketotetrose

Ketoheptose

Concept: Principal Molecules of the Living World
Chapter: [0.14] Biomolecules
[1]1.vi

Choose the most correct answer:

Which of the Na following is a buffer solution?

CH3COONa + NaCl in water

CH3COOH + HCl in water

CH3COOH + CH3COONa in water

HCl + NH4Cl in water

Concept: Buffer Solutions
Chapter: [0.03] Ionic Equilibria
[1]1.vii

Which cells is used as a source of power in flashlights?

Dry cell

Fuel cell

Hydrogen cell

None of them

Concept: Galvanic Cells Useful in Day-to-day Life
Chapter: [0.05] Electrochemistry
[1]1.viii

Choose the correct option.

Which of the following is the least acidic compound?

Concept: Classification of Alcohols, Phenols and Ethers
Chapter: [0.11] Alcohols, Phenols and Ethers
[1]1.ix

The boiling point of HCl is ______.

189 K

200 K

210 K

220 K

Concept: P - Block Group 17 Elements - Hydrogen Chloride
Chapter: [7.03] Group 17 Elements
[1]1.x

Choose the correct option.

Which of the following substrate will give ionic organic products on reaction?

CH3 – CH2 – OH + Na

CH3 – CH2 – OH + SOCl2

CH3 – CH2 – OH + PCl5

CH3 – CH2 – OH + H2SO4

Concept: Classification of Alcohols, Phenols and Ethers
Chapter: [0.11] Alcohols, Phenols and Ethers
[8]2 | Answer the following questions:
[1]2.i

Answer the following in one or two sentences.

Comment on the statement: no work is involved in an expansion of gas in a vacuum.

Concept: Expression for Pressure-volume (PV) Work
Chapter: [0.04] Chemical Thermodynamics
[1]2.ii

Name one amphoteric solvent.

Concept: Acids and Bases
Chapter: [0.03] Ionic Equilibria
[1]2.iii

Presence of disulphide link gives rise to which structure of protein?

Concept: Proteins - Structure of Proteins
Chapter: [14.02] Proteins
[1]2.iv

Answer the following in one sentence.

Name some chain-growth polymers.

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

Give names of the purines.

Concept: Biomolecules in the Cell - Nucleic Acids
Chapter: [0.14] Biomolecules
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[1]2.vi

Answer the following in one or two sentences.

What is standard cell potential for the reaction

\[\ce{3Ni_{(s)} + 2Al^{3+} (1M) → 3Ni^{2+} (1M) + 2Al(s)}\], if `E_"Ni"^circ` = –0.25 V and  `"E"_("Al")^circ` = –1.66 V?

Concept: Electrode Potential and Cell Potential
Chapter: [0.05] Electrochemistry
[1]2.vii

Answer the following.

Name two gases which deplete ozone layer.

Concept: Oxygen and Compounds of Oxygen
Chapter: [0.07] Elements of Groups 16, 17 and 18
[1]2.viii

Answer the following.

What is the action of bromine on magnesium metal?

Concept: Chemical Properties of Elements of Groups 16, 17 and 18
Chapter: [0.07] Elements of Groups 16, 17 and 18
SECTION - B
[2]3 | Attempt any EIGHT of the following questions:

Answer the following in one sentence.

Write reaction showing conversion of benzonitrile into benzoic acid.

Concept: Preparation of Carboxylic Acids
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[2]4

Solve

The half-life of a first-order reaction is 1.7 hours. How long will it take for 20% of the reactant to react?

Concept: Integrated Rate Equations
Chapter: [0.06] Chemical Kinetics
[2]5

Write structural formulae for Pentane-1,4-diol

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

Write structural formulae for Cyclohex-2-en-1-ol.

Concept: Alcohols, Phenols and Ethers - Nomenclature
Chapter: [0.11] Alcohols, Phenols and Ethers [11.01] Alcohols [11.02] Phenols [11.03] Ethers
[2]6

Answer the following

Which nanomaterial is used in sunscreen lotion? Write its use.

Concept: Introduction to Nanochemistry
Chapter: [0.16] Green Chemistry and Nanochemistry
[2]7

Answer in brief.

Write two points of difference between the properties of phenol and ethyl alcohol.

Concept: Alcohols and Phenols
Chapter: [0.11] Alcohols, Phenols and Ethers
[2]8

Give reason:

Reactions involving Grignard reagent must be carried out under anhydrous condition.

Concept: Reaction with Active Metals
Chapter: [0.1] Halogen Derivatives
[2]9

Write the reaction of conc. H2SO4 with sugar. What is the role of H2SO4 in this reaction?

Concept: P - Block Group 16 Elements - Sulphuric Acid
Chapter: [7.02] Group 16 Elements
[2]10

Answer the following

What is diazotisation?

Concept: Chemical Properties of Amines
Chapter: [0.13] Amines

Answer the following

Write diazotisation reaction of aniline?

Concept: Chemical Properties of Amines
Chapter: [0.13] Amines
[2]11

Answer the following in one or two sentences.

Why all collisions between reactant molecules do not lead to a chemical reaction?

Concept: Collision Theory of Bimolecular Reactions
Chapter: [0.06] Chemical Kinetics
[2]12

Answer the following in one sentence.

Write reaction showing conversion of ethanenitrile into ethanol.

Concept: Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
[2]13

In NaOH solution [OH] is 2.87 × 104. Calculate the pH of the solution.

Concept: The pH Scale
Chapter: [0.03] Ionic Equilibria
[2]14

Give scientific reasons:

On complete hydrolysis DNA gives equimolar quantities of adenine and thymine.

Concept: Biomolecules in the Cell - Nucleic Acids
Chapter: [0.14] Biomolecules
SECTION - C
[3]15 | Attempt any EIGHT of the following questions:

Answer the following in brief.

Obtain the relationship between the rate constant and half-life of a first-order reaction.

Concept: Integrated Rate Equations
Chapter: [0.06] Chemical Kinetics
[3]16

Answer the following question.

Draw geometric isomers and enantiomers of the following complex.

[Pt(en)3]4⊕

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

Answer the following question.

Draw geometric isomers and enantiomers of the following complex.

[Pt(en)2ClBr]2⊕

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

Draw geometric isomers of the following complex.

Geometrical isomers of Pt(NH3)2Cl2

Concept: Isomerism in Coordination Compounds
Chapter: [0.09] Coordination Compounds
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[3]17

Answer the following.

Write structure of natural rubber and neoprene rubber along with the name and structure of their monomers.

Concept: Polymers - Some Important Polymers
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
[3]18

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

Concept: Enthalpy (H)
Chapter: [0.04] Chemical Thermodynamics
[3]19

Answer the following in brief.

It is impossible to measure the potential of a single electrode. Comment.

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

Distinguish between SN1 and SN2 mechanism of substitution reaction.

Concept: Chemical Properties
Chapter: [0.1] Halogen Derivatives
[3]21

Answer the following in brief.

Explain graphically the effect of temperature on the rate of reaction.

Concept: Temperature Dependence of Reaction Rates
Chapter: [0.06] Chemical Kinetics
[3]22

An element has a bee structure with unit cell edge length of 288 pm. How many unit cells and number of atoms are present in 200 g of the element?

Concept: Cubic System
Chapter: [0.01] Solid State
[3]23
[1]23.i

Answer in brief.

What is the action of hydrazine on cyclopentanone in presence of KOH in ethylene glycol?

Concept: Chemical Properties of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[2]23.ii

How ketones are prepared from nitriles?

Concept: Preparation of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
[3]24

Answer the following:

What are anode and cathode for Leclanche' dry cell?

Concept: Galvanic Cells Useful in Day-to-day Life
Chapter: [0.05] Electrochemistry

Write electrode reactions and overall cell reaction when Leclanche's dry cell generates electricity.

Concept: Galvanic Cells Useful in Day-to-day Life
Chapter: [0.05] Electrochemistry
[3]25

Answer in brief.

Write reaction showing conversion of Acetaldehyde into acetaldehyde dimethyl acetal.

Concept: Chemical Properties of Aldehydes and Ketones
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
[3]26
[1]26.i

A solution of citric acid C6H8O7 in 50 g of acetic acid has a boiling point elevation of 1.76 K. If Kb for acetic acid is 3.07 K kg mol-1, what is the molality of solution?

Concept: Relative Molecular Mass of Non-volatile Substances - Boiling Point Elevation
Chapter: [0.02] Solutions
[2]26.ii

0.01 m aqueous formic acid solution freezes at – 0.021°C. Calculate its degree of dissociation, Kf = 1.86 K kg mol–1.

Concept: Colligative Properties of Electrolytes
Chapter: [0.02] Solutions
SECTION - D
[4]27 | Attempt any THREE of the following questions:

Answer the following

What are the differences between cast iron, wrought iron, and steel?

Concept: Extraction of Metals
Chapter: [0.08] Transition and Inner Transition Elements
[4]28

Answer the following :

Explain the relation between ionic product and solubility product to predict whether a precipitate will form when two solutions are mixed?

Concept: Solubility Product - Solubility product
Chapter: [0.03] Ionic Equilibria
[4]29

Write reaction showing conversion of p-bromoisopropylbenzene into p-isopropylbenzoic acid (3 steps).

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

Answer the following

Explain trends in ionisation enthalpies of d-block elements.

Concept: Trends in Atomic Properties of the First Transition Series
Chapter: [0.08] Transition and Inner Transition Elements
[4]31

Answer the following question.

What are cationic, anionic, and neutral complexes? Give one example of each.

Concept: Classification of Complexes
Chapter: [0.09] Coordination Compounds

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