Here we have a given Class 12 Chemistry Important Questions for Maharashtra Board HSC Examination 2024. Every students want to score good marks in Class 12 Board Exam,but number of students don't know how to score good marks. Dear students, following given questions had been asked in earlier HSC Board Examinations. From this post, you will know which type of questions had been asked in earlier Board Exams and same questions or same type of questions will be asked in your upcoming examination. If you study all these questions, you will get very good marks in your board examinations, Because so many questions from the following given questions will be asked in your upcoming examination.Therefore go through our Class 12 Chemistry Important Questions which are given in chapter-wise manner and simply try to solve these questions to score very good marks in Chemistry and obviously, you will! Best wishes to all dear students for your upcoming Maharashtra State Board Exam 2024.

 

यहां हमारे पास महाराष्ट्र बोर्ड HSC परीक्षा 2024 के लिए कक्षा 12वीं के Chemistry के महत्वपूर्ण प्रश्न दिए गए हैं। प्रत्येक छात्र कक्षा 12वीं की बोर्ड परीक्षा में अच्छे अंक प्राप्त करना चाहते हैं, लेकिन कई छात्र यह नहीं जानते कि अच्छे अंक कैसे प्राप्त करें। प्रिय छात्रों, नीचे दिए गए प्रश्न पिछले एचएससी बोर्ड परीक्षाओं में पूछे गए थे। इस पोस्ट से आप जानेंगे कि पिछली बोर्ड परीक्षाओं में किस प्रकार के प्रश्न पूछे गए थे और आपकी आगामी परीक्षा में भी इसी प्रकार के प्रश्न पूछे जाएंगे। यदि आप इन सभी प्रश्नों का अध्ययन करते हैं, तो आप अपनी बोर्ड परीक्षाओं में बहुत अच्छे अंक प्राप्त करेंगे, क्योंकि निम्नलिखित दिए गए प्रश्नों में से बहुत सारे प्रश्न आपकी आगामी परीक्षा में पूछे जाएंगे। इसलिए हमारे कक्षा 12 के Chemistry के महत्वपूर्ण प्रश्नों को देखें जो अध्याय में दिए गए हैं | Chemistry में बहुत अच्छे अंक प्राप्त करने के लिए इन प्रश्नों को बुद्धिमान तरीके से हल करने का प्रयास करें और जाहिर है, आप करेंगे! सभी प्रिय छात्रों को आपकी आगामी महाराष्ट्र राज्य बोर्ड परीक्षा 2024 के लिए शुभकामनाएं।

Class 12 Chemistry Important Questions | Chapter 4 Chemical Thermodynamics

• Give one statement of first law of thermodynamics and give its corollary. (March 2008)

• State and explain Hess's law of constant heat summation and give its four applications. (March  2008, Oct. 2008)

• Derive the relationship between the heat of reaction at constant pressure and at constant volume. (Oct. 2008)

• Prove that, ΔH = ΔU + ΔnRT. (March 2009).

• Write any two statements of first law of thermodynamics. Explain, Internal energy is a state function. (March 2009)

• Write the applications of Hess's law. (Oct. 2009)

• Derive the expression for the work done by an ideal gas in an isothermal and irreversible process. Under what conditions work done by a gas is zero ? (Oct. 2009)

• Distinguish between isothermal and adiabatic process. (March 2010)

• Derive an expression for maximum work done during the expansion of an ideal gas in isothermal and reversible process. (March 2011)

• The heat of neutralization between acetic acid and sodium hydroxide is less than -57.32 kJ. Explain. (March 2010)

• Derive an expression for the effect of temperature on the heat of reaction at constant pressure. (Oct. 2010)

• Define : (i) Enthalpy (ii) Molar heat capacity at constant volume. Show that ΔH = ΔU + PΔV, at constant pressure. (Oct. 2010)

• Explain the concept of maximum work. Derive an expression for maximum work done in isothermal reversible expansion of one mole of an ideal gas. (March 2011)

• Prove that ΔH = ΔU + ΔnRT. What is the condition under which ΔU = ΔH ? (March 2013)

• Define heat of reaction. (March 2013)

• 300 mmol of perfect gas occupies 13L at 320 K. Calculate the work done in joules when the gas expands

(a) Isothermally against a constant external pressure of 0.20 atm.

(b) Isothermal and reversible process.

(c) Into vaccum until the volume of gas is increased by 3L. (R = 8.314 J mol-1 K-1) (March 2013)

• Explain with reason, sign conventions of ΔS in the following reactions :

i. N2(g) + 3H2 ----> 2NH3(g)

ii. CO2(g) -----------> CO2(s) (March 2013)

• What are the conditions for spontaneous and non-spontaneous reactions in terms of free energy change? Define entropy. (Oct. 2013)

• Derive the relation ΔH - ΔU = ΔnRT (Oct. 2013)

• Derive a relation between ΔH and ΔU for a chemical reaction. (March 2014)

• One mole of a gas expands by 3L against a constant pressure of 3 atmosphere. Calculate the work done in 

(a) L.atmosphere

(b) Joules

(c) Calories (March 2014)

• Derive the relation between ΔG° and equilibrium constant (K) for the reaction aA + bB <----------> cC + dD (March 2014)

• State and explain Hess's law of constant heat summation. (Oct. 2014)

Also read : Class 12 Physics Important Questions

• Derive the equation : W = - Pext. ΔV. (March 2015)

• Define the following terms:

(a) Enthalpy of fusion

(b) Enthalpy of atomization (March 2015)

• Determine whether the reactions with the following ΔH and ΔS values are spontaneous or non-spontaneous. State whether the reactions are exothermic or endothermic. 

(a) ΔH = - 110 KJ, ΔS = +40 JK at 400 K

(b) ΔH = + 40 KJ, ΔS = - 120 JK at 250 K (March 2015)

• Write one statement of first law of thermodynamics and its mathematical expression. (March 2015)

• Write mathematical equations of first law of thermodynamics for the following processes :

(a) Adiabetic process 

(b) Isochoric process (March 2016)

• Define enthalpy of sublimation. How is it related to enthalpy of fusion and enthalpy of vaporization. (March 2016)

• Calculate C - Cl Bond enthalpy from following reaction :

CH3Cl + Cl2 -----> CH2Cl2 + HCl ΔH° = - 104 kJ. If C-H , Cl - Cl and H - Cl bond enthalpies are 414, 243 and 431 kJ/mol respectively. (March 2016)

• Define the term enthalpy what will happen to the internal energy if work is done by the system. (March 2017)

• Derive an expression for maximum work. (March 2017) 

• Calculate ΔH° for the reaction between ethene and water to form ethyl alcohol from the following data : 

ΔcH° C2H5OH (l) = -1368 kJ, ΔcH°C2H4 (g)  = -1410 kJ,

Does the calculated ΔH° represent the enthalpy of formation of liquid ethanol?  (March 2017)  

• Define :

i. Enthalpy of atomization

ii. Enthalpy of vaporization (March 2018)

• Calculate the change in internal energy at 298 K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is -42.0 kJ/mol. (March 2018)

•  Write the mathematical equation for : 

(a) Work done in isothermal reversible process

(b) Work done in isothermal Irreversible process. (March 2019) 

• State any two statements of second law of thermodynamics. Write two examples of state function.(March 2019)

• Calculate the work done in the following reaction at 50°C. State whether work is done on the system or by the system. 

SO2(g) + 1/2 O2(g) --------> SO3(g) (March 2019)

• Write the conditions for maximum work done by the system. (March 2019)

• Calculate ΔH° for the reaction, CH4(g) + O2(g) ------> CO2(g) + H2O from the following data :  

(March 2019)

•  Reversible process standard enthalpy of combustion calculate the enthalpy change for the reaction :

N2(g) + 3H2(g) -------> 2NH3(g) The bond enthalpies are :

 (March 2020)  

• Define : standard enthalpy of combustion. (March 2020)

• Write features of reversible process. (March 2020)

• For the reaction : N2O4(g) ------> 2NO2(g) (ΔH° = + 57.24kJ,  ΔS° = + 175.8 J/K) At what temperature the reaction will be spontaneous? (March 2020)

• One mole of an ideal gas is expanded isothermally and reversibly from 10 L to 15 L at 300 K. Calculate the work done in the process (March 2022)

• Write the mathematical equation for the first law of thermodynamics for 

i) isothermal process

ii) adiabatic process (March 2022)

• Write the correct condition for spontaneity in terms of Gibbs energy. (March 2023)

• Define extensive property. Calculate the work done during the expansion of 2 moles of an ideal gas from 10 dm3 to 20 dm3 at 298 K in vaccum. ( March 2023)

• 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 processs (R = 8.314 JK-1mol-1) (March 2023)

Also read :Class 12 Biology Important Questions

👉 Students are suggested to go through our Class 12 Chemistry Important Questions to score more in your upcoming 2023 Board Examination. 👇👇

Class 12 Chemistry Important Questions Chapter-wise

 Click on the following links to get Class 12 Chemistry Important Questions.👇👇 

• Chapter 1 - Solid States

• Chapter 2 - Solutions

• Chapter 4 - Chemical thermodynamics

• Chapter 5 -  Electrochemistry

• Chapter 6 -  Chemical Kinetics

• Chapter 7 - Group 16,17 & 18 Elements

• Chapter 8 -  Transition And Inner Transition Elements

• Chapter 9 -  Coordination Compounds

• Chapter 10 - Halogen Derivatives

• Chapter 11 -  Alcohols,Phenols & Ethers

• Chapter 12 - Aldehydes, Ketones & Carboxylic Acids

• Chapter 13 - Amines

• Chapter 14 -  Biomolecules

• Chapter 15 -  Polymers