The standard Gibbs free energy change (G°) at 25°C for the dissociation of N2O4(g) to NO2(g) is (given, equilibrium constant = 0.15, R = 8.314 JK/mol)
1.1 kJ
4.7 kJ
8.1 kJ
38.2 kJ
Identify the correct statement from the following in a chemical reaction
The entropy always increases
The change in entropy along with suitable change in enthalpy decides the rate of reaction
The enthalpy always decreases
Both the enthalpy and the entropy remain constant
A plot of ln K against (abscissa) is expected to be a straight line with intercept on ordinate axis equal to
R ×
In which of the following reactions will U be equal to H?
B.
The standard molar heat of formation of ethane, CO2 and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustion of ethane will be
-372 kcal
162 kcal
-240 kcal
183.5 kcal
When 1 mole of CO2 (g) occupying volume 10 L at 27°C is expanded under adiabatic condition, temeprature falls to 150 K. Hence, final volume is
5 L
20 L
40 L
80 L
Match List I (Equations) with List II (Types of process) and select the correct option.
List I (Equation) |
List II (Types of process) |
||
A. | 1. | Non-spontaneous | |
B. | 2. | Equilibrium | |
C. | 3. | Spontaneous and endothermic | |
D. | T > | 4. | Spontaneous |
A | B | C | D |
1 | 2 | 3 | 4 |
A | B | C | D |
3 | 4 | 2 | 1 |
A | B | C | D |
4 | 1 | 2 | 3 |
A | B | C | D |
2 | 1 | 1 | 3 |
Heat of formation, of an explosive compound like NCl3 is
positive
Negative
Zero
Positive or Negative