Which of the following are not state functions?

(I) q + W                        (II) q

(III) W                           (IV) H-TS

1. (I) and (IV)                     

2. (II), (III) and (IV)

3. (I) , (II) and (III)               

4.  (II) and (III)

Subtopic:  Classification of System, Extensive & Intensive Properties |
 71%
From NCERT
NEET - 2008
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Consider the following reactions :

(i) H+(aq) + OH-(aq) = H2O(l) H = -x1 kJ mol-1

(ii) H2(g) + 12O2(g) = H2O(l) H = -x2 kJ mol-1

(iii) CO2(g) + H2(g) = CO(g) + H2O(l) H = -x3 kJ mol-1

(iv) C2H5(g) + 52O2(g) = 2CO2(g) + H2O(l) H = -x4 kJ mol-1

Enthalpy of formation of H2O(l) is:

1. -x2 kJ mol-1 

2. +x3 kJ mol-1

3. -x4 kJ mol-1

4. -x1 kJ mol-1

Subtopic:  Enthalpy & Internal energy |
 75%
From NCERT
NEET - 2007
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Identify the correct statement for change of Gibbs energy for a system (Gsystem) at constant temperature and pressure:

(1) If Gsystem > 0, the process is spontaneous

(2) If Gsystem = 0, the system has attained equilibrium

(3) If Gsystem = 0, the system is still moving in a particular direction

(4) If Gsystem < 0, the process is not spontaneous

Subtopic:  Gibbs Energy Change |
 87%
NEET - 2006
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The enthalpy and entropy change for the reaction :

Br2 (l) + Cl2 (g) 2BrCl (g)

are 30 kJ mol-1 and 105 J K-1 mol-1 respectively.

The temperature at which the reaction will be in equilibrium is :

1. 285.7 K 2. 273.4 K
3. 450.9 K 4. 300.1 K
Subtopic:  Spontaneity & Entropy |
 82%
From NCERT
NEET - 2006
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Links
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NEET 2023 - Target Batch - Aryan Raj Singh

The enthalpy of combustion of H2, cyclohexene (C6H10) and cyclohexane (C6H12) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:

(a) -121 kJ per mol

(b) +121 kJ per mol

(c) +242 kJ per mol

(d) -242 kJ per mol

Subtopic:  Thermochemistry |
 59%
NEET - 2006
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Consider the reactionat 300K

H2(9) + Cl2(9) →2HCI(g), ΔH° = — 185 KJ

If 3 mole of H2 completely react with 3 mol of Cl2 to form Cl, U° of the reaction will be

(1) Zero

(2) –185 KJ

(3) -555 KJ

(4) None

Subtopic:  2nd & 3rd Law of Thermodynamics |
From NCERT
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For a perfectly crystalline solid Cpm = aT3, where a is constant. If Cpm is 0.42 J/K–mol at 10 K, molar entropy at 10 K is

1. 0.42 J/K–mol

2. 0.14 J/K–mol

3. 4.2 J/K–mol

4. zero

Subtopic:  Spontaneity & Entropy |
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One mole of an ideal monoatomic gas expands isothermally against constant external pressure of 1 atm from initial volume of 1L to a state where its final pressure becomes equal to external pressure. If initial temperature of gas is 300 K then total entropy change of system in the above process is :

[R = 0.082 L atm mol–1 K–1 = 8.3 J mo1–1K–1].

(1) 0

(2) Rln (24.6)

(3) Rln (2490)

(4) 32Rln(24.6)

Subtopic:  Spontaneity & Entropy |
 50%
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At 1000 K water vapour at 1 atm. has been found to be dissociated into H2 and O2 to the extent of 3 x 10–6 %.Calculate the free energy decrease of the system, assuming ideal behaviour.

(1) –ΔG = 90,060 cal

(2) –ΔG = 20 cal

(3) –ΔG = 480 cal

(4) –ΔG = –45760 cal

Subtopic:  Spontaneity & Entropy |
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An ideal gas is taken from the same initial pressure P1 to the same final pressure P2 by three different processes. If it is known that point 1 corresponds to a reversible adiabatic and point 2 corresponds to a single stage adiabatic then

(1) Point 3 may be a two stage adiabatic.

(2) the average K.E. of the gas is maximum at point 1

(3) Work done by surrounding in reaching point number '3' will be maximum

(4) If point4 and point 5 lie along a reversible isotherm then T5 < T1.

Subtopic:  2nd & 3rd Law of Thermodynamics |
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NEET 2023 - Target Batch - Aryan Raj Singh
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