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Showing posts with label Thermochemistry. Show all posts ## Free preparation Medical and Engineering Entrance Exams | Thermo chemistry (Thermodynamics)

### India Study Solution Test Series (Chemistry Objective Questions)

NEET, JEE IIT, AIIMS, NTSE | Engineering, BDS, MBBS Admission Test
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As you are aware that in each set of India Study Solution test series we bring for you 10 new most important expected questions with their hints & solutions.
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Chemistry Practice Questions: Thermodynamics (Thermo-chemistry)
India Study Solution MCQ Test Series – Set 4 (Q. No 31-40)
Question 31: Which of the following is an endothermic reaction?
a. N
b. N
c. H
d. C

Question 32: An ideal gas is taken around the cycle ABCA as shown in P-V diagram. The net work done by the gas during the cycle is equal to:
a. 12P1V1
b. 6P
c. 5P
d. P

Question 33: Which of the following is correct option for free expansion of an ideal gas under adiabatic condition?
a. q = 0, ∆T < 0, w ≠ 0
b. q = 0, ∆T ≠ 0, w = 0
c. q ≠ 0, ∆T = 0, w = 0
d. q = 0, ∆T = 0, w = 0

Question 34: The energy associated with a system by virtue of its position is
a. Gibbs Energy
b. Internal Energy
c. Kinetic Energy
d. Potential Energy

Question 35: For isothermal expansion in case of an ideal gas:
a. ∆G = ∆S
b. ∆G = ∆H
c. ∆G = -T.∆S
d. None of these

Question 36: One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. The ∆E for this process is (R = 2 cal. mol
a. 1381.1 cal
b. Zero
c. 163. 7 cal
d. 9 L atm

Question 37: The difference between ∆H and ∆E on a molar basis for the combustion of Methane gas at T K (kelvin) would be:
a. Zero
b. - RT
c. -2RT
d. -3RT

Question 38: Which reaction, with the following values of ∆H, ∆S, at 400 K is spontaneous and endothermic?
a. ∆H = -48 kJ; ∆S = + 135 J/K
b. ∆H = -48 kJ; ∆S = -135 J/K
c. ∆H = + 48 kJ; ∆S = +135 J/K
d. ∆H = +48 kJ; ∆S = -135 J/K

Question 39: When a certain amount of ethylene was combusted, 6226 kJ heat was evolved. If heat of combustion of ethylene is 1411 kJ/mole, the volume of O
a. 296.5 ml
b. 296.5 litres
c. 6226 x 22.4 litres
d. 22.4 litres

Question 40: For the reaction
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l)
at constant temperature, ∆H – ∆E is
a. + RT
b. -3RT
c. +3RT
d. -RT
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India Study Solution MCQ Test Series - Hints and Solutions
tHERMODYNAMICS (THERMO-CHEMISTRY)

THERMODYNAMICS (Thermo-chemistry) - More India Study Solution Chemistry Test Series Questions

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THERMODYNAMICS | THERMOCHEMISTRY
India Study Solution Test Series (Chemistry Practice Questions)
NEET, JEE IIT, AIIMS, NTSE | Engineering, BDS, MBBS Admission Test
Hi Guys,
Welcome back to your own site India Study Solution
As you are aware that in each set of India Study Solution test series we bring for you 10 new most important questions with their hints & solutions. This post is from our Chemistry Solutions chapter - Thermodynamics (Thermo-chemistry).
Each set is a combination of typically important some basic with some advanced level questions structured to enhance your confidence before appearing NEET, JEE (IIT), BHU, JIPMER, COMEDK and other MBBS Admission Tests, Engineering Entrance Exams, NTSE etc.
Many coaching institutes in India are charging thousands of rupees whereas you can get the same benefit on this site sitting at the comfort of your home totally
Friends, if you like the post please bookmark this site or if you have not subscribed us yet then please subscribe before you forget (it is free) so that you get information whenever we publish more questions on any subject (
Please scroll down to find NEET and JEE syllabus of Thermodynamics (Thermochemistry).

### Chemistry Practice Questions: Thermodynamics

(Thermo-chemistry)
India Study Solution MCQ Test Series – Set 3 (Q. No 21-30)
Question 21: A gas expands isothermally against a constant external pressure of 1 atm from a volume of 10 dm
a. -312 J
b. +123 J
c. +312 J
d. -213 J

Question 22: The incorrect statement according to second law of thermodynamics is
a. Heat can flow from colder body to a hotter body of its own
b. All spontaneous processes are thermodynamically irreversible
c. Heat can be converted into work completely without causing some permanent change in the system (or) surroundings
d. Perpetual motion machine of second kind is not possible

Question 23: If one mole of ammonia and one mole of hydrogen chloride are mixed in a close container to form ammonium chloride gas, then
a. ∆H > ∆U
b. ∆H = ∆U
c. ∆H < ∆U
d. No relationship

Question 24: Molar heat capacity of water in equilibrium with the ice at constant pressure is:
a. Zero
b. Infinity (∞)
c. 40.45 KJK
d. 5.48 JK

Question 25: The work done in adiabatic process on ideal gas by a constant external pressure would be
a. Zero
b. ∆E
c. ∆H
d. ∆G

Question 26: For the equations
C (diamond) + 2H
C (g) + 4H (g) ==> CH
Predict whether
a. ∆H
b. ∆H
c. ∆H
d. ∆H

Question 27: If a process is both endothermic and spontaneous then
a. ∆S > 0
b.∆S < 0
c.∆H < 0
d.∆G > 0

Question 28: An ideal gas occupying a volume of 2 dm
a. 10 dm
b. 8 dm
c. 10 dm
d. 10 m

Question 29: Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?
a. Exothermic and increasing disorder
b. Exothermic and decreasing disorder
c. Endothermic and increasing disorder
d. Endothermic and decreasing disorder

Question 30: Which of the following conditions regarding a chemical process ensures its spontaneity at all temperature?
a. ∆H > 0, ∆G < 0
b. ∆H < 0, ∆S > 0
c. ∆H < 0, ∆S < 0
d. ∆H > 0, ∆S < 0

Thermodynamics / Thermo-chemistry (NEET / JEE syllabus):
General characteristics, electronic configuration, occurrence, anomalous properties of the first element of each group, diagonal relationship, trends in the variation of properties (such as ionization enthalpy, atomic and ionic radii), trends in chemical reactivity with oxygen, water, hydrogen and halogens; uses of the compounds of Group I Elements (Alkali Metals) and Group II Elements (Alkaline Earth Metals). Preparation and Properties of Some important Compounds: sodium carbonate, sodium chloride, sodium hydroxide and sodium hydrogen carbonate, biological importance of sodium and potassium. Anomalous behaviour of beryllium. Industrial use lime and limestone, biological importance of Mg and Ca.
>>>>> <<<<<
India Study Solution MCQ Test Series - Hints and Solutions
tHERMODYNAMICS (THERMO-CHEMISTRY)
Set 3 (Q. No.21–30)

THERMODYNAMICS (Thermo-chemistry) - India Study Solution Chemistry Test Series Questions

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### THERMODYNAMICS

Chemistry India Study Solution Test Series (Confidence Booster)
NEET, JEE Main, JEE Advanced, IIT, AIIMS, NTSE | MBBS, BDS Admission Test
Welcome guys to your own site India Study Solution
Below you will get carefully selected, 10 MCQ practice questions in our each Test Series with hints & solutions (given at the end) from our Chemistry Solutions exclusively from - Thermodynamics, Thermo Chemistry.
Each series or set is a combination of 10 typically important some basic and also advanced level questions for NEET-UG, JEE Main & Advanced (IIT) AIIMS, IMS BHU, JIPMER, COMEDK, MBBS Admission Tests, Engineering Entrance Exams, NEST and other such competitive exams.
Please scroll down for NEET and JEE syllabus of Thermodynamics chapter.

Chemistry Practice Questions: Thermodynamics (Thermo chemistry)
MCQ Test Series – Set 2 (Q. No 11-20)
Question 11: A process in which no heat change takes place is called
a. An isothermal process
c. An isobaric process
d. An isochoric process

Question 12: When a solid melts there is
a. An increase in enthalpy
b. A decrease in enthalpy
c. No change in enthalpy
d. A decrease in internal energy

Question 13: The change in enthalpy that takes place when one mole of the compound is formed from its elements is called
a. Heat of formation
b. Heat of fusion
c. Heat of combustion
d. Heat of sublimation

Question 14: Hess’s law states that
a. The standard enthalpy of an overall reaction is the sum of the enthalpy changes in individual reaction
b. Enthalpy of formation of compound is same as the enthalpy of decomposition of the compound into constituent elements, but with opposite sign
c. At constant temperature the pressure of a gas is inversely proportional to its volume
d. The mass of a gas dissolved per lit of a solvent is proportional to the pressure of the gas in equilibrium with the solution

Question 15: Hess’s law is used to determine
a. Heat of formation of substances which are otherwise difficult to calculate
b. Heat of transition
c. Heat of dissociation
d. All of these

Question 16: A certain mass of gas is expanded from (1L, 10 atm) to (4L, 5 atm) against a constant external pressure of 1 atm. If initial temperature of gas is 300K and the heat capacity of process is 50 J/oC. Then the enthalpy change during the process is (1 L ~ 100 J)
a. ∆H = 15 kJ
b. ∆H = 15.7 kJ
c. ∆H = 14.4 kJ
d. ∆H = 14.7 kJ

Question 17: The enthalpies of elements under the following conditions are assumed to be
a. Zero at 298K and 1 atm
b. Unity at 298K and 1 atm
c. Zero at 273K and 1 atm
d. Unity at 273K and 1 atm

Question 18: If the total enthalpy of reactants and products is HR and HP respectively, then for exothermic reaction
a. HR = HP
b. HR < HP
c. HR > HP
d. HP ≥ HR

Question 19: The first law of thermodynamics is represented by the equation:
a. ∆E = Q - W
b. ∆E = Q + W
c. W = Q + ∆E
d. Q = W + ∆E

Question 20: Enthalpy of neutralisation of all strong acids and strong bases has the same value because
a. Neutralisation leads to the formation of a salt and water
b. Strong acid and bases are iconic substances
c. Acids always furnish H+ ions and bases always furnish OH- ions
d. The net chemical change involves the combination of 1 mol of H+ ions and 1 mol OH- ions to form water.
Thermodynamics (Syllabus for NEET and JEE):
Fundamentals of thermodynamics: System and surroundings, extensive and intensive properties, state functions, types of processes. Thermal equilibrium, Zeroth law of thermodynamics, concept of temperature. First  law  of  thermodynamics: internal  energy  and  enthalpy,  heat  capacity  and  specific  heat, measurement of U and H, Hess’s law of constant heat summation. Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, ionization, solution and dilution. Introduction of entropy as state function. Second law of thermodynamics: Gibbs energy change for spontaneous and non-spontaneous processes, reversible and irreversible processes, criteria for equilibrium and spontaneity. Carnot engine and its efficiency. Third law of thermodynamics: Brief introduction.
India Study Solution - Hints and Solutions Chemistry MCQ Test Series
Thermodynamics
Solutions of Chemistry Test Series (MCQ) – Set 2 (Q. No.11–20)
Hint:
H = E + (PV) and
∆E = q + W = (50 x 300 – 3 x 100) J [as Tf = 2 x 300 K = 600 K] = 14.7 kJ
∆H = 14700 + 10 x 100 = 15700 J = 15.7 kJ

THERMODYNAMICS - India Study Solution Chemistry Test Series Questions

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Chemistry Solved MCQ Test Series, Practice Questions
NEET, IIT JEE Main, AIIMS, NTSE

Welcome to your own site India Study Solution Below you will get carefully selected 10 MCQ practice questions in our each Test Series with hints & solutions (given at the end) from Chemistry Solutions chapter - Thermodynamics, Thermochemistry.
All these are typically important questions for NEET-UG, JEE Main & Advanced (IIT) AIIMS, JIPMER, COMEDK, MBBS Admission Tests, Engineering Entrance Exams, NEST and other such competitive exams.
Thermodynamics (Syllabus for NEET and JEE):
Fundamentals of thermodynamics: System and surroundings, extensive and intensive properties, state functions, types of processes. Thermal equilibrium, Zeroth law of thermodynamics, concept of temperature. First  law  of  thermodynamics: internal  energy  and  enthalpy,  heat  capacity  and  specific  heat, measurement of U and H, Hess’s law of constant heat summation. Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, ionization, solution and dilution. Introduction of entropy as state function. Second law of thermodynamics: Gibbs energy change for spontaneous and non-spontaneous processes, reversible and irreversible processes, criteria for equilibrium and spontaneity. Carnot engine and its efficiency. Third law of thermodynamics: Brief introduction.

### Chemistry Practice Questions: Thermodynamics (Thermochemistry)MCQ Test Series – Set 1 (Q. No. 1-10)

Question 1: Which of the following statements is correct?
a. Only internal energy is a state function but not work.
b. Only work is a state function but not internal energy.
c. Both internal energy and work are state functions.
d. Neither internal energy nor work is a state function.

Question 2: The amount of water that can be dissociated by the amount of heat liberated when 49 g H2SO4 and 20 g NaOH are mixed and reacted in aqueous solution is:
a. 1.803
b. 3.58
c. 0.895
d. 17.9 Question 3: A sample of 2 kg of helium (assumed ideal) is taken through the process ABC and another sample of 2 kg of the same gas is taken through the process ADC. Then the temperature of the states A and B are (Given R = 8.3 joules/mol K):

a. TA = 120.5K, TB = 120.5K
b. TA = 241 K, TB = 241 K
c. TA = 120.5 K, TB = 241 K
d. TA = 241 K, TB = 482 K

Question 4: What is the work done against the atmosphere when 25 grams of water vaporises at 373 K against a constant external pressure of atm ? Assume that steam obeys perfect gas laws. Given that the molar enthalpy of vaporization is 9.72 kcal/mole, what is the change of internal energy in the above process?
a. 1294.0 cals, 11247 cals
b. 921.4 cals, 11074 cals
c. 1024.8 cals, 12470.6 cals
d. 1129.3 cals, 10207 cals

Question 5: Warming ammonium chloride with sodium hydroxide in a test tube is an example of:
a. Closed system
b. Isolated system
c. Open system
d. None of these

a. Q = 0
b. ∆E = 0
c. ∆W = 0
d. ∆V = 0

Question 7: A gas expands from 10 litres to 20 litres against a constant external pressure of 10 atm. The pressure-volume work done by the system is
a. 100 L atm
b. -100 L atm
c. 10 L atm
d. -10 L atm

Question 8: In an isothermal expansion of a gaseous sample the correct relation is (consider w (work) with sign according to new IUPAC convention)
[The reversible and irreversible processes are carried out between same initial and final states]
a. wrev  > wirrev
b. wirrev  > wrev
c. qrev< qirrev
d. cannot be predicted

Question 9: A tightly closed thermoflask contains some ice cubes. This constitutes
a. closed system
b. open system
c. isolated system
d. Non-thermodynamic system

Question 10: The process CO2 (g) + H2O → 2H+ (aq) + CO3-2 (aq),
∆H = +2000J taking place in a closed vessel is accompanied with [given S0 of CO2, H2O, H+ (aq) & CO3-2(aq) = 213, 70, 0 & 57J/Mol/K]
a. DSsys = -340 J/K
b. DSsur ≈ -7KJ/K
c. DStotal = -333 J/K
d. DSsys = -340 J/K

India Study Solution - Hints and Solutions Chemistry MCQ Test Series
Thermodynamics
Solutions of Chemistry Test Series (MCQ) – Set 1 (Q. No.1 –10)
T2 = 4T­­1
PA VA = nRTA
5 x 10 = [(2 x 1000) ÷ 2] x 0.082 TA
or, TA = 120.5,
at constant volume, (PA / TA) = (PB / TB)
TB = PB.TA / TA = 241 K.
Mole of H2O = 1.39
Pv = nRT
1 x v = 1.39 x 0.082 x 373
v = 42.8.
w = Pext. dv = 1 x [42.8] atm x lit
= (– 42.8 x 101.325) J = [–(42.8 x 101.325) ÷ 4.2] cal
= 1024.8 cal
H = E + (Pv) = 12470.6 cal/s.