Which of the following is not an endothermic reaction?
1. Combustion of methane
2. Decomposition of water
3. Dehydrogenation of ethane or ethylene
4. Conversion of graphite to diamond
The free energy change is negative when -
1. The surroundings do no electrical work on the system.
2. The surroundings do electrical work on the system.
3. The system does electrical work on the surroundings.
4. The system does no electrical work on the surroundings.
Assume each reaction is carried out in an open container. For which of the following reactions will
1.
2.
3.
4.
Identify the false statement among the following.
1. | Temperature is a state function. |
2. | Work is a state function. |
3. | Change in the state is completely defined when the initial and final states are specified. |
4. | Work appears at the boundary of the system. |
Plants and living beings are examples of:
1. Isolated system
2. Adiabatic system
3. Open system
4. Closed system
What is the value of ∆H for the reaction 2Al + Cr₂O₃ → 2Cr + Al₂O₃, knowing that the enthalpies of
formation of Al₂O₃ and Cr₂O₃ are –1596 kJ and –1134 kJ, respectively?
1. | –1365 kJ | 2. | 2730 kJ |
3. | –2730 kJ | 4. | –462 kJ |
For the reaction, 2Cl(g) Cl2(g), the correct option is:
1.
2.
3.
4.
Hydrolysis of sucrose is given by the following reaction
Sucrose + H2O Glucose + Fructose
If the equilibrium constant (Kc) is 21013 at 300 K, the value of at the same temperature will be:
1. 8.314 J mol–1 K–1300 Kln (21013)
2. 8.314 J mol–1 K–1300 Kln (31013)
3. –8.314 J mol–1 K–1300 Kln (41013)
4. –8.314 J mol–1 K–1300 Kln (21013)
The enthalpy of combustion of methane, graphite, and dihydrogen at 298 K are, –890.3 kJ mol–1 , –393.5 kJ mol–1, and –285.8 kJ mol–1 respectively. The enthalpy of formation of CH4(g) is-
1. | –74.8 kJ mol–1 | 2. | –52.27 kJ mol–1 |
3. | +74.8 kJ mol–1 | 4. | +52.26 kJ mol–1 |
For the reaction A + B → C + D + q (kJ/mol), entropy change is positive. The reaction will be
1. Possible only at high temperature
2. Possible only at low temperature
3. Not possible at any temperature
4. Possible at any temperature