MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
At 300 K, the reactions which have following values of thermodynamic parameters occur spontaneously [Roorkee 1999] |
| A. | \[\Delta {{G}^{o}}=-400\,\,kJ\,\,mo{{l}^{-1}}\] |
| B. | \[\Delta {{H}^{o}}=200\,\,kJ\,\,mo{{l}^{-1}},\,\,\,\Delta {{S}^{o}}=-4\,\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| C. | \[\Delta {{H}^{o}}=-200\,kJ\,mo{{l}^{-1}},\,\,\Delta {{S}^{o}}=4\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| D. | \[\Delta {{H}^{o}}=200\,J\,mo{{l}^{-1}},\,\,\Delta {{S}^{o}}=40\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| Answer» B. \[\Delta {{H}^{o}}=200\,\,kJ\,\,mo{{l}^{-1}},\,\,\,\Delta {{S}^{o}}=-4\,\,J{{K}^{-1}}mo{{l}^{-1}}\] | |
| 2. |
For spontaneity of a cell, which is correct [Orissa JEE 2004] |
| A. | \[\Delta G=0,\,\Delta E=0\] |
| B. | \[\Delta G=-ve,\,\Delta E=0\] |
| C. | \[\Delta G=+ve,\,\Delta E=+ve\] |
| D. | \[\Delta G=-ve,\,\Delta E=+ve\] |
| Answer» E. | |
| 3. |
The standard enthalpy of the decomposition of \[{{N}_{2}}{{O}_{4}}\] to \[N{{O}_{2}}\] is 58.04 kJ and standard entropy of this reaction is 176.7 J/K. The standard free energy change for this reaction at \[{{25}^{o}}C\] is [AIIMS 1999] |
| A. | 539 kJ |
| B. | ? 539 kJ |
| C. | ? 5.39 kJ |
| D. | 5.39 kJ |
| Answer» E. | |
| 4. |
Internal energy is [AFMC 2004] |
| A. | Partly potential and partly kinetic |
| B. | Totally kinetic |
| C. | Totally potential |
| D. | None of these |
| Answer» B. Totally kinetic | |
| 5. |
At \[{{27}^{o}}C,\] one mole of an ideal gas is compressed isothermally and reversibly from a pressure of 2 atm to 10 atm. The values of \[\Delta E\] and q are \[(R=2)\] [BHU 2001] |
| A. | 0, ? 965.84 cal |
| B. | ? 965.84 cal, + 965.84 cal |
| C. | + 865.58 cal, ? 865.58 cal |
| D. | ? 865.58 cal, ? 865.58 cal |
| Answer» B. ? 965.84 cal, + 965.84 cal | |
| 6. |
The bond dissociation energies of gaseous \[{{H}_{2}},\,C{{l}_{2}}\] and \[HCl\] are 104, 58 and 103 kcal respectively. The enthalpy of formation of \[HCl\] gas would be [MP PET 1997; MP PMT 1999, 2001] |
| A. | ? 44 kcal |
| B. | 44 kcal |
| C. | ? 22 kcal |
| D. | 22 kcal |
| Answer» D. 22 kcal | |
| 7. |
Identify the intensive quantity from the following [IIT JEE 1993] |
| A. | Enthalpy and temperature |
| B. | Volume and temperature |
| C. | Enthalpy and volume |
| D. | Temperature and refractive index |
| Answer» E. | |
| 8. |
Among them intensive property is [AFMC 2004] |
| A. | Mass |
| B. | Volume |
| C. | Surface tension |
| D. | Enthalpy |
| Answer» D. Enthalpy | |
| 9. |
Which of the following is not a state function [MH CET 2004; AIIMS 2001] |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Work |
| D. | Entropy |
| Answer» D. Entropy | |
| 10. |
In thermodynamics which one of the following is not an intensive property [Kerala (Med.) 2002] |
| A. | Pressure |
| B. | Density |
| C. | Volume |
| D. | Temperature |
| Answer» D. Temperature | |
| 11. |
It is general principle that the less energy a system contains, it is [MH CET 1999] |
| A. | Less stable |
| B. | More stable |
| C. | Unstable |
| D. | More unstable |
| Answer» C. Unstable | |
| 12. |
The cooling in refrigerator is due to [KCET 2005] |
| A. | Reaction of the refrigerator gas |
| B. | Expansion of ice |
| C. | The expansion of the gas in the refrigerator |
| D. | The work of the compressor |
| Answer» D. The work of the compressor | |
| 13. |
Conditions of standard state used in thermochemistry is |
| A. | \[{{0}^{o}}C\] and 1 atm |
| B. | \[{{20}^{o}}C\] and 1 atm |
| C. | \[{{25}^{o}}C\] and 1 atm |
| D. | \[0\,K\] and 1 atm |
| Answer» D. \[0\,K\] and 1 atm | |
| 14. |
Entropy is maximum in case of [BVP 2004] |
| A. | Steam |
| B. | Water at \[{{0}^{o}}C\] |
| C. | Water at \[{{4}^{o}}C\] |
| D. | Ice |
| Answer» B. Water at \[{{0}^{o}}C\] | |
| 15. |
For a car not engine, the source is at \[500K\] and the sink at \[300K\]. What is efficiency of this engine [BHU 2004] |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.6 |
| D. | 0.3 |
| Answer» C. 0.6 | |
| 16. |
The entropy values (in JK-1 mol-1) of H2(g) = 130.6, Cl2(g) = 223.0 and HCl(g) = 186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction \[{{H}_{2(g)}}+C{{l}_{2(g)}}\to 2HC{{l}_{(g)}}\] is [BHU 2005] |
| A. | 540.3 |
| B. | 727.3 |
| C. | ? 166.9 |
| D. | 19.8 |
| Answer» E. | |
| 17. |
Highest entropy is in [BVP 2003] |
| A. | Hydrogen |
| B. | Water |
| C. | Graphite |
| D. | Mercury |
| Answer» B. Water | |
| 18. |
The entropy changed involved in the conversion of 1 mole of liquid water at 373 K to vapour at the same temperature will be \[[\Delta {{H}_{\text{vap}}}=2.257kJ/gm]\] [MP PET 2002] |
| A. | 0.119 kJ |
| B. | 0.109 kJ |
| C. | 0.129 kJ |
| D. | 0.120 kJ |
| Answer» C. 0.129 kJ | |
| 19. |
Equal volumes of monoatomic and diatomic gases at same initial temperature and pressure are mixed. The ratio of specific heats of the mixture \[({{C}_{p}}/{{C}_{v}})\] will be [AFMC 2002] |
| A. | 1 |
| B. | 2 |
| C. | 1.67 |
| D. | 1.5 |
| Answer» E. | |
| 20. |
Which of the following endothermic processes are spontaneous[CBSE PMT 2001] |
| A. | Melting of ice |
| B. | Evaporation of water |
| C. | Heat of combustion |
| D. | Both A and B |
| Answer» E. | |
| 21. |
If 0.75 mole of an ideal gas expands isothermally at \[{{27}^{o}}C\] from 15 litres to 25 litres, the maximum work obtained is [AFMC 1999] |
| A. | 8.40 J |
| B. | 9.34 J |
| C. | 10.86 J |
| D. | 10.43 J |
| Answer» C. 10.86 J | |
| 22. |
For which of the processes is \[\Delta S\] negative [Pb. PMT 1998] |
| A. | \[{{H}_{2}}(g)\to 2H(g)\] |
| B. | \[{{N}_{2}}(g)\,1atm\to {{N}_{2}}(g)\,8\,atm\] |
| C. | \[2S{{O}_{3}}(g)\to 2S{{O}_{2}}(g)+{{O}_{2}}(g)\] |
| D. | \[{{C}_{(diamond)}}\to {{C}_{(graphite)}}\] |
| Answer» C. \[2S{{O}_{3}}(g)\to 2S{{O}_{2}}(g)+{{O}_{2}}(g)\] | |
| 23. |
For a reversible spontaneous change \[\Delta S\] is |
| A. | \[\frac{\Delta E}{T}\] |
| B. | \[\frac{P\,\Delta V}{T}\] |
| C. | \[\frac{q}{T}\] |
| D. | RT log K |
| Answer» D. RT log K | |