All Courses
Get the App Signup / Login
Sign in Open App
NEET Exam  >  NEET Tests  >  Chemistry Class 11  >  Test: Hess's Law of Constant Heat Summation - NEET MCQ

Test: Hess's Law of Constant Heat Summation - NEET MCQ


Test Description

15 Questions MCQ Test Chemistry Class 11 - Test: Hess's Law of Constant Heat Summation

Test: Hess's Law of Constant Heat Summation for NEET 2024 is part of Chemistry Class 11 preparation. The Test: Hess's Law of Constant Heat Summation questions and answers have been prepared according to the NEET exam syllabus.The Test: Hess's Law of Constant Heat Summation MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Hess's Law of Constant Heat Summation below.
Solutions of Test: Hess's Law of Constant Heat Summation questions in English are available as part of our Chemistry Class 11 for NEET & Test: Hess's Law of Constant Heat Summation solutions in Hindi for Chemistry Class 11 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Test: Hess's Law of Constant Heat Summation | 15 questions in 15 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 11 for NEET Exam | Download free PDF with solutions
Test: Hess's Law of Constant Heat Summation - Question 1
Save

Direction (Q. Nos. 1-7) This section contains 7 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Given,

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 1

Depend on whether the formation of compounds is exothermic or endothermic.For exothermic reaction, enthalpy of formation would be negative and for endothermic,it is  positive.

Test: Hess's Law of Constant Heat Summation - Question 2
Save

Given,



Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 2


Applying i-ii/2-3/2iii
We get ∆fH of NCl3 in terms of ∆H1, ∆H2 and ∆H3

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Hess's Law of Constant Heat Summation - Question 3
Save

Diborane is a potential rocket fuel which undergoes combustion according to the reaction,

From the following data, enthalpy change for the combustion of diborane is 



Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 3

On applying equation 1 + 3 times equation 2 minus equation 4 plus equation 3, we will get enthalpy change for the combustion of diborane.

Test: Hess's Law of Constant Heat Summation - Question 4
Save

Following diagram represents Born-Haber cycle to determine lattice energy of NaCI(s). It is based on Hess’s law of constant heat summation. ΔlatticeH° of 
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 4

The correct answer is Option A.
 
-411.2 = 108.4 + 495.6 + 121.0 - 348.6 + LE
=>LE= -411.2 - 108.4 - 495.6 - 121.0 +348.6 
=> LE = -787.6 ~ -788 kJ mol-1

Test: Hess's Law of Constant Heat Summation - Question 5
Save




Thus,
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 5

Put the things we need as reactant on LHS the product on RHS. To do that, we will apply equation S+I+D-2E-U.

Test: Hess's Law of Constant Heat Summation - Question 6
Save

Given, HCI (g) → H (g) + Cl (g) at 298 K (say temperature T K),

For

Q. Thus, for the given reaction  (at 0 K) is
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 6

Ho= Ho of product - Ho of reactant
so ho =(6.197 + 6.272 ) - 8.644
= 3.825
Ho298-Ho = 431.961 - 3.825=428.136532873

Test: Hess's Law of Constant Heat Summation - Question 7
Save

The measured enthalpy change for burning of ketene (g) (CH2CO) is - 981.1 kJ mo-1 at 298 K ,CH2CO (g)+ 2O2(g) → 2CO2 (g) + H2O (g) and that of CH4 (g) is - 802.3 kJ mol-1 at 298 K

Thus, enthalpy change at 298 K for the following thermochemical reaction is
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 7

CH2CO (g)+ 2O2(g) → 2CO2 (g) + H2O (g)     -(i)
CH4 (g)+ 2O2(g) → CO2 (g) + 2H2O (g)     -(ii)

On 2(ii)-(i)

2CH4 (g)+ 2O2(g) → CH2CO (g) + 3H2O (g)     -(iii)
∆H(iii) = 2∆H(ii) - ∆H(i) = [2 (-802.3) -(-981.1)] -623.5 kJ mol-1

Test: Hess's Law of Constant Heat Summation - Question 8
Save

The condition for free expansion of an ideal gas under adiabatic condition is 
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 8

Explanation:

For free expansion of ideal gas,

Pext = 0

WpV = 0

For adiabatic process, 

q = 0

Conclusion:

Thus, the condition for free expansion of an ideal gas under adiabatic condition is q = 0, w = 0, ΔT = 0.

Test: Hess's Law of Constant Heat Summation - Question 9
Save

Direction (Q. Nos. 9 and 10) This section contains a paragraph, wach describing  theory, experiments, data etc. three Questions related to paragraph have been  given.Each question have only one correct answer among the four given  ptions  (a),(b),(c),(d).

Consider the following thermochemical equations



 

Q. ΔrH° of the following thermochemical reaction is

CIO2 (g) + O (g) →  CIO3 (g)
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 9

The question can be simply done by understanding that this reaction is endothermic so ∆H is negative.

Hence A is correct.

Test: Hess's Law of Constant Heat Summation - Question 10
Save

Consider the following thermochemical equations



 

Q. ΔrH° of the following thermochemical reaction is
Test: Hess's Law of Constant Heat Summation - Question 11
Save

Direction (Q. Nos. 11) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q. For liquid water at




Compare the parameters ΔH1, ΔH2 ... in Column I with the corresponding values in kJ in Column II.
Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 11

∆H1=∆rH298=-285.83kJmol-¹
∆H²=Cp(liq)∆T=75.29×75 =5.64kJmol-¹
∆H³=∆Hvap =40.88kJmol-¹
∆H⁴=Cp(gas)∆T=35.57×(-75) =-2.5183kJmol-¹

*Answer can only contain numeric values
Test: Hess's Law of Constant Heat Summation - Question 12
Save

Direction (Q. Nos. 12-15) This section contains 4 questions. when worked out will result in an integer from 0 to 9 (both inclusive).

Q. Based on (BE) values, ΔrH° of the following reaction 298 K is

Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 12

Let the BE value of B---Br bond be x and B---Cl bond be y
BE of BBr3 is 3x, BCl3=3y , BBr2Cl=2x+y ,BCl2Br=2y+x
then ∆Hr=Hr(products)-Hr(reactants)=(2x+y+2y+x) - (3x+3y)=0

*Answer can only contain numeric values
Test: Hess's Law of Constant Heat Summation - Question 13
Save

Heat of combustion of CH2CO(g) is - 981.1 kJ mol-1 and that of CH4 (g) is - 802.3 kJat 298 K. If 1247.0 kJ of heat is released in the following change

Q. How many moles of CH4(g)are used?

Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 13

[2CH4 + 2O2 → CH2O + H2O]n
∆HC = n[-981.1-(-8023×2)]
1247       = n[-981.1+1604.6] 
N[623.5] = 1247
N = 4
So, no of moles of CH4 = n×2 = 2×2 = 4

*Answer can only contain numeric values
Test: Hess's Law of Constant Heat Summation - Question 14
Save

Consider the following reactions


Q. What is the resonance energy (in kcal) of A?

Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 14

Resonance energy = (Observed ∆H) - (Theoretical ∆H)
= (-98.0) - 2(-45.0)
= -8 kcal mol-1
So we have Resnance energy = 8

*Answer can only contain numeric values
Test: Hess's Law of Constant Heat Summation - Question 15
Save

Given, enthalpy of combustion of carbon (s) = -94 kcal mol-1

H2(g) = - 68 kcal mol-1 and CXH4 = - 318 kcal mol-1 and  ΔfH° (CxH4) = - 100 kcal mol-1

Q. What is the value of x?

Detailed Solution for Test: Hess's Law of Constant Heat Summation - Question 15



127 videos|232 docs|88 tests
Join Course
Information about Test: Hess's Law of Constant Heat Summation Page
In this test you can find the Exam questions for Test: Hess's Law of Constant Heat Summation solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Hess's Law of Constant Heat Summation, EduRev gives you an ample number of Online tests for practice

Top Courses for NEET

127 videos|232 docs|88 tests
Join Course
Download as PDF

Top Courses for NEET

Important Questions for Hess's Law of Constant Heat Summation

Find all the important questions for Hess's Law of Constant Heat Summation at EduRev.Get fully prepared for Hess's Law of Constant Heat Summation with EduRev's comprehensive question bank and test resources. Our platform offers a diverse range of question papers covering various topics within the Hess's Law of Constant Heat Summation syllabus. Whether you need to review specific subjects or assess your overall readiness, EduRev has you covered. The questions are designed to challenge you and help you gain confidence in tackling the actual exam. Maximize your chances of success by utilizing EduRev's extensive collection of Hess's Law of Constant Heat Summation resources.

Hess's Law of Constant Heat Summation MCQs with Answers

Prepare for the Hess's Law of Constant Heat Summation within the NEET exam with comprehensive MCQs and answers at EduRev. Our platform offers a wide range of practice papers, question papers, and mock tests to familiarize you with the exam pattern and syllabus. Access the best books, study materials, and notes curated by toppers to enhance your preparation. Stay updated with the exam date and receive expert preparation tips and paper analysis. Visit EduRev's official website today and access a wealth of videos and coaching resources to excel in your exam.

Online Tests for Hess's Law of Constant Heat Summation Chemistry Class 11

Practice with a wide array of question papers that follow the exam pattern and syllabus. Our platform offers a user-friendly interface, allowing you to track your progress and identify areas for improvement. Access detailed solutions and explanations for each test to enhance your understanding of concepts. With EduRev's Online Tests, you can build confidence, boost your performance, and ace Hess's Law of Constant Heat Summation with ease. Join thousands of successful students who have benefited from our trusted online resources.
© EduRev
Education Revolution
Follow Us
Signup to see your scores go up
within 7 days!
Takes less than 10 seconds to signup