At constant pressure and temperature, the direction of any chemical reaction is one where, the...... decrease.

(a) entropy                (b) enthalpy

(c) Gibbs energy        (d) none of these

Concept Questions :-

Gibbs Energy Change
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Which is correct at equilibrium?

1. H = 0              2. GTotal=0

3. STotal=0          4. E=0

Concept Questions :-

Gibbs Energy Change
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'The free energy change due to a reaction is zero when

1. The reactants are initially mixed.

2.  A catalyst is added

3. The system is at equilibrium

4. The reactants are completely consumed

Concept Questions :-

Gibbs Energy Change
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18 g of ice is converted into water at 0°C and 1 atm. The entropy of H2O(s) and H2O(l) are 38.2 and 60 J K-1 mol-1 respectively. the enthalpy for this conversion will be

(1) 5951.4 J/mol

(2) 595.14 J/mol

(3) -595.14 J/mol

(4) None of these

Concept Questions :-

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

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

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

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

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

Concept Questions :-

Gibbs Energy Change
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When enthalpy and entropy change for a chemical reaction are –2.5 × 103 cal and 7.4 cal deg–1 respectively. Predict the reaction at 298 K is [AFMC 1998; MH CET 1999; CBSE PMT 2000]

(1) Spontaneous

(2) Reversible

(3) Irreversible

(4) Non-spontaneous

Concept Questions :-

Gibbs Energy Change
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Which of the following is not a correct statement? [ (Engg.) 2002]

(1) When ΔG is negative, the process is spontaneous

(2) When ΔG is zero, the process is in a state of equilibrium

(3) When ΔG is positive, the process is non-spontaneous

(4) None of these

 

Concept Questions :-

Gibbs Energy Change
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For a reaction at equilibrium-

1. G=G=0

2. G=0 but not G

3. G=0 but not G

4. G=G0

Concept Questions :-

Gibbs Energy Change
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Following reaction occurs at 25C :

2NOg, 1×10-5atm+Cl2g, 1×10-2atm2NOClg, 1×10-2atmG is-

1. -45.65 kJ

2. -28.53 kJ

3. -22.82 kJ

4. -57.06 kJ

Concept Questions :-

Gibbs Energy Change
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If a process is both endothermic and spontaneous, then :

1. S>0

2. S<0

3. H<0

4. G>0

Concept Questions :-

Gibbs Energy Change
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