Calculate thange in enthalpy for a given reaction,

2H2O2(l) 2H2O(l) + O2(g)

(Given the heat of formation of H2O2(l) and H2O(l) are -188 and -286 kJ/mol
respectively)       

1. -196 kJ/mol             

2. + 196 kJ/mol

3. +948 kJ/mol             

4. -948 kJ/mol

Subtopic:  Enthalpy & Internal energy |
 68%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Enthalpy of the reaction,

CH4(g) + 1/2O2(g) → CH3OH(l), is negative. If the enthalpy of combustion of CH4 and CH3OH are x and y respectively, then
which relation is correct?                                 

1. x>y         

2. x<y         

3. x=y           

4. xy

Subtopic:  Enthalpy & Internal energy |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If 50 calorie are added to a system and system does work of 30 calorie on surroundings, the change in internal energy of system is:

1. 20 cal                             

2. 50 cal

3. 40 cal                             

4. 30 cal

Subtopic:  Enthalpy & Internal energy |
 92%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Which statements are correct?

1. 2.303 logP2P1=Hvap.RT2-T1T1T2 is called Clausius-Clapeyron equation

2. Hvap.Boiling Point=88 J mol-1K-1 is called Trouton's rule

3. Entropy is a measure of unavailable energy, i.e.,

     unavailable energy = entropy x temperature

4. All of the above

 

Subtopic:  Enthalpy & Internal energy |
 80%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The reaction CH4(g) + Cl2(g)CH3Cl(g) + HCl(g)

has H=-25 Kcal

Bond Bond Energy Kcal
EC-Cl 84
EH-Cl 103
EC-H X
ECl-Cl Y
X:Y 9:5


From the given data, what is the bond enthalpy of Cl-Cl bond?

1. 70 Kcal 

2.  80 Kcal

3.  67.75 Kcal

4. 57.85 Kcal

Subtopic:  Enthalpy & Internal energy |
 51%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Consider the reaction

N2(g) + 3H2(g)2NH3(g) carried out at constant temperature and pressure. If H and E are enthalpy change and internal energy change respectively, which of the following expression is True?

1.  HE                        2. H=E3.  H<E                       4. H>E

Subtopic:  Enthalpy & Internal energy |
 68%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

In the reaction at 300 K

H2(g) + Cl2(g)2HCl(g)       H°= -185 kJ

if 2 mol of H2 completely react with 2 mole of Cl2 to form HCl. What is U° for this reaction?

(1) 0

(2) -185 kJ

(3) -370 kJ

(4) None of these

Subtopic:  Enthalpy & Internal energy |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

What will be the standard enthalpy of reaction for the following reaction using the listed enthalpies of reaction:-

3Co(s) + 2O2(g)Co3O4(s);       H=?

2Co(s) + O2(g) 2CoO(s)          H1= -475.8 KJ

6CoO(s) + O2(g) 2Co3O4(s)     H2 = -355.0 KJ

(1) -891.2 KJ

(2) -120.8 KJ

(3) 891.2 KJ

(4) -830.8 KJ

Subtopic:  Enthalpy & Internal energy |
 65%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

For given following equations and H° values, determine the enthalpy of reaction at 298 K for the reaction 

C2H4(g) + 6F2(g)  2CF4(g) + 4HF(g)

H2(g) + F2(g)  2HF(g)       H1°= -537 kJ

C(s) + 2F2(g) CF4(g)         H2°=-680 kJ

2C(s) + 2H2(g) C2H4(g)    H3°= 52 kJ

1. -1165 

2. -2486

3. +1165

4. +2486

Subtopic:  Enthalpy & Internal energy |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If the bond energies of H-H, Br-Br, and H-Br are 433, 192 and 364 kJ mol-1 respectively, 

the H° for the reaction

H2(g) + Br2(g) 2HBr(g) is

1.  -103 kJ               

2. -261 kJ

3. +103 kJ               

4. +261 kJ

Subtopic:  Enthalpy & Internal energy |
 57%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh