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SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 chapter 4 - Chemical Thermodynamics [Latest edition]

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12th Standard HSC Chemistry Maharashtra State Board 2021 - Shaalaa.com
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Chapter 4: Chemical Thermodynamics

Multiple choice questionsVery short answer questionsShort answer questions (Type- I)Short answer questions (Type- II)Long answer questionsLong Answer Questions
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Multiple choice questions

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 Chapter 4 Chemical Thermodynamics Multiple choice questions

1 Mark

Multiple choice questions | Q 1

An intensive property amongst the following is ______.

  • Mass

  • Volume

  • Number of moles

  • Temperature

Multiple choice questions | Q 2

The value of 1dm3 bar is ______.

  • 10 J

  • 102 J

  • 103 J

  • 10-2 J

Multiple choice questions | Q 3

The work done in the dm3 bar when 200 mL of ethylene gas and 150 mL of HCl gas were allowed to react at 1 bar pressure is ______.

  • 0.10

  • 0.15

  • 0.20

  • 0.2

Multiple choice questions | Q 4

The work done in vacuum when 300 m mole of an ideal gas expands until its volume is increased by 2.3 dm3 at 1 bar pressure is ______ mole.

  • Zero

  • One

  • Two

  • Three

Multiple choice questions | Q 5

For an Isothermal process

  • W = - Q

  • ∆U = W

  • ∆U = Q + W

  • ∆U = Q

Multiple choice questions | Q 6

For an Isochoric process

  • ∆U = 0

  • ∆V = 0

  • ∆P = 0

  • Q = 0

Multiple choice questions | Q 7

The change in internal energy in a reaction when 2kJ of heat is released by the system and 6 kJ of work is done on the system will be ______.

  • +4 kJ

  • 4kJ

  • +3 kJ

  • – 8 kJ

Very short answer questions

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 Chapter 4 Chemical Thermodynamics Very short answer questions

1 Mark

Very short answer questions | Q 1

Write the expression to calculate maximum work done when 1 mole of an ideal gas expands isothermally and reversibly from V1 to V2.

Very short answer questions | Q 2

Write the mathematical relation between ΔH and ΔU during the formation of one mole of CO2 under standard conditions.

Very short answer questions | Q 3

The standard enthalpy of formation of water is - 286 kJ mol-1. Calculate the enthalpy change for the formation of 0.018 kg of water.

Very short answer questions | Q 4

Write the mathematical expression of the First Law of Thermodynamics for the Isobaric process

Very short answer questions | Q 5

What is the sign convention when work is done on the system by the surrounding?

Very short answer questions | Q 6

Write the expression showing the relation between enthalpy change and internal energy change for gaseous phase reaction.

Very short answer questions | Q 7

Calculate enthalpy of formation of HCl if bond enthalpies of H2, Cl2 and HCl are 434 kJ mol-1, 242 kJ mol–1 and 431 kJ mol–1 respectively.

Short answer questions (Type- I)

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 Chapter 4 Chemical Thermodynamics Short answer questions (Type- I)

2 Marks

Short answer questions (Type- I) | Q 1.1

Define the Standard enthalpy of combustion.

Short answer questions (Type- I) | Q 1.2

Define the Enthalpy of sublimation.

Short answer questions (Type- I) | Q 2

State and explain Hess’s law of constant heat summation.

Short answer questions (Type- I) | Q 3

Write the features of reversible processes.

Short answer questions (Type- I) | Q 4

Derive an expression for pressure-volume work.

Short answer questions (Type- I) | Q 5

The enthalpy change of the following reaction

\[\ce{CH_{4(g)} + Cl_{2(g)} -> CH3Cl_{(g)} + HCl_{(g)}}\]

ΔH° = –104 kJ. Calculate C – Cl bond enthalpy.

The bond enthalpies are

Bond C − H Cl − Cl H − Cl
∆H°/kJ mol−1 414 243 431
Short answer questions (Type- I) | Q 6

Calculate the standard enthalpy of combustion of CH4(g) if ΔfH°(CH4) = – 74.8 kJ mol–1, ΔfH°(CO2) = – 393.5 kJ mol–1 and ΔfH°(H2O) = – 285.8 kJ mol–1.

Short answer questions (Type- II)

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 Chapter 4 Chemical Thermodynamics Short answer questions (Type- II)

3 Marks

Short answer questions (Type- II) | Q 1

Define an isolated system.

Short answer questions (Type- II) | Q 1

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.

Short answer questions (Type- II) | Q 2

Answer the following in one or two sentences.

What is enthalpy of fusion?

Short answer questions (Type- II) | Q 2

Answer the following question.

Derive the expression for the maximum work.

Short answer questions (Type- II) | Q 3

Derive the expression for work done in chemical reaction. Write the relationship between ∆H and ∆U for an isochoric process.

Short answer questions (Type- II) | Q 4

Define standard enthalpy of formation.

Short answer questions (Type- II) | Q 5

0.022 kg of CO2 is compressed isothermally and reversibly at 298 K from an initial pressure of 100 kPa when the work obtained is 1200 J, calculate the final pressure.

Short answer questions (Type- II) | Q 6.1

Define the Enthalpy of vaporization.

Short answer questions (Type- II) | Q 6.2

Define the Standard enthalpy of combustion.

Short answer questions (Type- II) | Q 6.3

Why work done in vacuum is zero?

Long answer questions, Long Answer Questions

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 Chapter 4 Chemical Thermodynamics Long answer questions, Long Answer Questions

4 Marks

Long answer questions | Q 1.1

Define the Enthalpy of atomization.

Long answer questions | Q 1.1

Define the Extensive properties.

Long answer questions | Q 1.2

Calculate the standard enthalpy of formation of liquid methanol from the following data:

  1. \[\ce{CH3OH_{(l)} + \frac{3}{2} O_{2(g)} -> CO_{2(g)} + 2H2O_{(l)}}\]     ∆H° = – 726 kJ mol–1
  2. \[\ce{C_{(Graphite)} + O_{2(g)} -> CO_{2(g)}}\]          ∆cH° = – 393 kJ mol–1
  3. \[\ce{H_{2(g)} + \frac{1}{2} O_{2(g)} -> H2O_{(l)}}\]          ∆fH° = – 286 kJ mol–1 
Long answer questions | Q 2.1

Define the Bond enthalpy.

Long answer questions | Q 2.2

Define the Enthalpy of ionisation.

Long answer questions | Q 2.3

Calculate the standard enthalpy of the reaction.

\[\ce{2Fe_{(s)} + \frac{3}{2} O_{2(g)} -> Fe2O_{3(s)}}\]

Given:

1. \[\ce{2Al_{(s)} + Fe2O_{3(s)} -> 2Fe_{(s)} + Al_2O_{3(s)}}\], rH° = –847.6 kJ
2. \[\ce{2Al_{(s)} + \frac{3}{2} O_{2(g)} -> Al2O_{3(s)}}\], rH° = –1670 kJ
Long answer questions | Q 3.1

Answer in brief.

How much heat is evolved when 12 g of CO reacts with NO2? The reaction is:

4CO(g)  2NO2(g) → 4CO2(g) + N2(g), ΔrH° = - 1200 kJ

Long answer questions | Q 3.2

Write an application of Hess’s law.

Long answer questions | Q 3.3

Does the following reaction represent a thermochemical equation?

\[\ce{CH_{4(g)} + 2O_{2(g)} -> CO_{2(g)} + 2H2O_{(g)}}\], ∆fH° = –900 kJ mol–1

Long answer questions | Q 4.1

Classify the following into intensive and extensive properties.

Pressure, volume, mass, temperature.

Long Answer Questions | Q 4.2

Define state function and write two examples of it.

Chapter 4: Chemical Thermodynamics

Multiple choice questionsVery short answer questionsShort answer questions (Type- I)Short answer questions (Type- II)Long answer questionsLong Answer Questions
12th Standard HSC Chemistry Maharashtra State Board 2021 - Shaalaa.com

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 chapter 4 - Chemical Thermodynamics

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Chemistry Maharashtra State Board 2021 chapter 4 (Chemical Thermodynamics) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board 12th Standard HSC Chemistry Maharashtra State Board 2021 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in 12th Standard HSC Chemistry Maharashtra State Board 2021 chapter 4 Chemical Thermodynamics are Chemical Thermodynamics, Terms Used in Thermodynamics, Nature of Heat and Work, Expression for Pressure-volume (PV) Work, Concept of Maximum Work, Internal Energy (U), First Law of Thermodynamics, Enthalpy (H), Enthalpies of Physical Transformations, Thermochemistry, Spontaneous (Irreversible) Process.

Using SCERT Maharashtra Question Bank 12th Board Exam solutions Chemical Thermodynamics exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in SCERT Maharashtra Question Bank Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board 12th Board Exam prefer SCERT Maharashtra Question Bank Textbook Solutions to score more in exam.

Get the free view of chapter 4 Chemical Thermodynamics 12th Board Exam extra questions for 12th Standard HSC Chemistry Maharashtra State Board 2021 and can use Shaalaa.com to keep it handy for your exam preparation

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