NEET Questions Solved


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

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Which is correct at equilibrium?

1. H = 0              2. GTotal=0

3. STotal=0          4. E=0

Concept Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


'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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


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 Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level:


If a process is both endothermic and spontaneous, then :

1. S>0

2. S<0

3. H<0

4. G>0

Concept Videos :-

#32 | Gibb's Free Energy
#35 | Relation between ΔGo & Keq : II

Concept Questions :-

Gibbs Energy Change
Explanation is a part of a Paid Course. To view Explanation Please buy the course.

Difficulty Level: