MCQOPTIONS
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MCQOPTIONS
This section includes 52 Mcqs, each offering curated multiple-choice questions to sharpen your 11th Class knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In an isobaric process, the ratio of heat supplied to the system \[(dQ)\] and work done by the system \[(dW)\] for diatomic gas is [AFMC 2002] |
| A. | 1 : 1 |
| B. | 7 : 2 |
| C. | 7 : 5 |
| D. | 5 : 7 |
| Answer» C. 7 : 5 | |
| 2. |
To calculate the amount of work done in joules during reversible isothermal expansion of an ideal gas, the volume must be expressed in [KCET (Med.) 2001] |
| A. | \[{{m}^{3}}\] only |
| B. | \[d{{m}^{3}}\] only |
| C. | \[c{{m}^{3}}\] only |
| D. | Any one of them |
| Answer» E. | |
| 3. |
For the reaction \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\,\,\to \,\,{{H}_{2}}O(l),\,\Delta H=-285.8\,\,kJ\,\,mo{{l}^{-1}}\]\[\Delta S=-0.163\,kJ\,mo{{l}^{-1}}{{K}^{-1}}.\] What is the value of free energy change at \[{{27}^{o}}C\] for the reaction? [KCET 1999] |
| A. | \[-236.9\,kJ\,mo{{l}^{-1}}\] |
| B. | \[-\,281.4\,kJ\,mo{{l}^{-1}}\] |
| C. | \[-\,334.7\,kJ\,mo{{l}^{-1}}\] |
| D. | \[+334.7\,kJ\,mo{{l}^{-1}}\] |
| Answer» B. \[-\,281.4\,kJ\,mo{{l}^{-1}}\] | |
| 4. |
Following reaction occurring in an automobile \[2{{C}_{8}}{{H}_{18}}(g)+25{{O}_{2}}(g)\to 16C{{O}_{2}}(g)+18{{H}_{2}}O(g).\] The sign of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be [CBSE PMT 1994; KCET 1999] |
| A. | +, ?, + |
| B. | ?, +, ? |
| C. | ?, +, + |
| D. | +, +, ? |
| Answer» C. ?, +, + | |
| 5. |
The heat content of a system is called |
| A. | Internal energy |
| B. | Entropy |
| C. | Free energy |
| D. | Enthalpy |
| Answer» E. | |
| 6. |
When \[50c{{m}^{3}}\] of \[0.2\,N\,{{H}_{2}}S{{O}_{4}}\] is mixed with \[50c{{m}^{3}}\] of \[1\,N\,KOH\], the heat liberated is [KCET 2004] |
| A. | 11.46 kJ |
| B. | 57.3 kJ |
| C. | 573 kJ |
| D. | 573 J |
| Answer» E. | |
| 7. |
The \[{{H}_{2}}O(g)\] molecule dissociates as (i) \[{{H}_{2}}O(g)\to H(g)+OH(g);\,\Delta H=490\,kJ\] (ii) \[OH(g)\to H(g)+O(g);\,\Delta H=424\,kJ\] The average bond energy (in kJ) for water is |
| A. | 490 |
| B. | 424 |
| C. | 914 |
| D. | 914/2 |
| Answer» E. | |
| 8. |
The equation \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}C{{l}_{2}}\to HCl\] (\[\Delta {{H}_{298}}=-22060\,kcal\]) means [CMC Vellore 1991] |
| A. | The heat absorbed when one gram molecule of \[HCl\] is formed from its elements at \[{{25}^{o}}C\] is 22.060 kcal |
| B. | The heat given out when one gram molecule of \[HCl\] is formed from its elements at 298 K is 22.060 kcal |
| C. | The heat absorbed when one atom of hydrogen reacts with one atom of chlorine to form one molecule of \[HCl\] at \[{{25}^{o}}C\] and one atmospheric pressure is 22.060 kcal |
| D. | The heat absorbed when one gram equivalent of \[HCl\] is formed from its elements at 298 K is 22.060 kcal |
| E. | The intrinsic heat of one molecule of \[HCl\] is 22.060 kcal more than the intrinsic heats of one atom of hydrogen and one atom of chlorine |
| Answer» C. The heat absorbed when one atom of hydrogen reacts with one atom of chlorine to form one molecule of \[HCl\] at \[{{25}^{o}}C\] and one atmospheric pressure is 22.060 kcal | |
| 9. |
If at 298 K the bond energies of \[C-H,\,C-C,\] \[C=C\] and \[H-H\] bonds are respectively 414, 347, 615 and 435 kJ \[mo{{l}^{-1}}\], the value of enthalpy change for the reaction \[{{H}_{2}}C=C{{H}_{2}}(g)+{{H}_{2}}(g)\to {{H}_{3}}C-C{{H}_{3}}(g)\] at 298 K will be [AIEEE 2003] |
| A. | + 250 kJ |
| B. | ? 250 kJ |
| C. | + 125 kJ |
| D. | ? 125 kJ |
| Answer» E. | |
| 10. |
Which of the following is not a correct statement? [AMU (Engg.) 2002] |
| A. | When \[\Delta G\] is negative, the process is spontaneous |
| B. | When \[\Delta G\] is zero, the process is in a state of equilibrium |
| C. | When \[\Delta G\] is positive, the process is non-spontaneous |
| D. | None of these |
| Answer» E. | |
| 11. |
The relation between \[\Delta G\] and \[E\] for a cell is \[\Delta G=-nFE\]; the cell reaction will be spontaneous if [MP PET 1995] |
| A. | \[G\] is negative |
| B. | \[G\] is positive |
| C. | \[E\] is negative |
| D. | \[E\] is positive |
| Answer» E. | |
| 12. |
Given the bond energies \[N\equiv N,\,\,H-H\] and \[N-H\] bonds are \[945,\,436\] and \[391\,kJ\,mol{{e}^{-1}}\] respectively, the enthalpy of the following reaction \[{{N}_{2}}(g)+3{{H}_{2}}(g)\to 2N{{H}_{3}}(g)\] is [EAMCET 1992; JIPMER 1997] |
| A. | \[-93\,kJ\] |
| B. | \[102\,kJ\] |
| C. | \[90\,kJ\] |
| D. | \[105\,kJ\] |
| Answer» B. \[102\,kJ\] | |
| 13. |
Consider the reactions \[C(s)+2{{H}_{2}}(g)\to C{{H}_{4}}(g),\Delta H=-x\,kcal\] \[C(g)+4H(g)\to C{{H}_{4}}(g),\,\Delta H=-{{x}_{1}}\,kcal\] \[C{{H}_{4}}(g)\to C{{H}_{3}}(g)+H(g),\,\Delta H=+y\,kcal\] The bond energy of \[C-H\] bond is [JIPMER 1997] |
| A. | \[y\,kcal\,mo{{l}^{-1}}\] |
| B. | \[{{x}_{1}}\,kcal\,mo{{l}^{-1}}\] |
| C. | \[x/4\,kcal\,mo{{l}^{-1}}\] |
| D. | \[{{x}_{1}}/4\,kcal\,mo{{l}^{-1}}\] |
| Answer» B. \[{{x}_{1}}\,kcal\,mo{{l}^{-1}}\] | |
| 14. |
Which of the following has lowest fusion temperature [MP PET 2003] |
| A. | Naphthalene |
| B. | Diamond |
| C. | NaCl |
| D. | Mn |
| Answer» B. Diamond | |
| 15. |
The equilibrium constant of a reaction at \[298\,K\] is \[5\times {{10}^{-3}}\] and at \[1000\,K\] is \[2\times {{10}^{-5}}\]. What is the sign of \[\Delta H\] for the reaction [Pb. CET 1998] |
| A. | \[\Delta H=0\] |
| B. | \[\Delta H\] is negative |
| C. | \[\Delta H\] is positive |
| D. | None of these |
| Answer» C. \[\Delta H\] is positive | |
| 16. |
When a gas undergoes adiabatic expansion, it gets cooled due to [DCE 2002] |
| A. | Loos of kinetic energy |
| B. | Fall in temperature |
| C. | Decrease in velocity |
| D. | Energy used in doing work |
| Answer» C. Decrease in velocity | |
| 17. |
For melting of 3 moles of water at \[{{0}^{o}}C\] the \[\Delta {{G}^{o}}\] is [MP PMT 2001] |
| A. | Zero |
| B. | + ve |
| C. | ? ve |
| D. | Unpredictable |
| Answer» B. + ve | |
| 18. |
For the process dry ice \[\xrightarrow{{}}\,C{{O}_{2}}(g)\] [KCET 2000] |
| A. | \[\Delta H\] is positive while \[\Delta \rho \] is negative |
| B. | Both \[\Delta H\] and \[\Delta \rho \] are negative |
| C. | Both \[\Delta H\] and \[\Delta \rho \] are positive |
| D. | \[\Delta H\] is negative while \[\Delta \rho \] is positive |
| Answer» D. \[\Delta H\] is negative while \[\Delta \rho \] is positive | |
| 19. |
Enthalpy of formation of two compounds x and y are ? 84 kJ and ? 156 kJ respectively. Which of the following statements is correct [CBSE PMT 2001] |
| A. | x is more stable than y |
| B. | x is less stable than y |
| C. | Both x and y are unstable |
| D. | x and y are endothermic compounds |
| Answer» C. Both x and y are unstable | |
| 20. |
\[{{C}_{\text{(graphite)}}}+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\] \[\Delta H=-94.05\,kcal\,mo{{l}^{-1}}\] \[{{C}_{\text{(diamond)}}}+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g);\,\]\[\Delta H=-94.50\,kcal\,mo{{l}^{-1}}\] therefore [DPMT 2001] |
| A. | \[{{C}_{\text{(graphite)}}}\,\to \,{{C}_{\text{(diamond)}}}\]; \[\Delta H_{298K}^{o}=-450\,cal\,mo{{l}^{-1}}\] |
| B. | \[{{C}_{\text{(diamond)}}}\,\to \,{{C}_{\text{(graphite)}}};\] \[\Delta H_{298K}^{o}=+450\,cal\,mo{{l}^{-1}}\] |
| C. | Graphite is the stabler allotrope |
| D. | Diamond is harder than graphite |
| Answer» D. Diamond is harder than graphite | |
| 21. |
Which of the following will have the highest bond energy [MP PMT 1990] |
| A. | \[{{F}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[B{{r}_{2}}\] |
| D. | \[{{I}_{2}}\] |
| Answer» C. \[B{{r}_{2}}\] | |
| 22. |
Which of the following unit represents largest amount of energy [AMU 2001] |
| A. | Calorie |
| B. | Joule |
| C. | Erg |
| D. | Electron volt |
| Answer» B. Joule | |
| 23. |
In thermodynamics, a process is called reversible when [AIIMS 2001] |
| A. | Surroundings and system change into each other |
| B. | There is no boundary between system and surroundings |
| C. | The surroundings are always in equilibrium with the system |
| D. | The system changes into the surroundings spontaneously |
| Answer» D. The system changes into the surroundings spontaneously | |
| 24. |
The enthalpy of neutralization of \[HCN\] by \[NaOH\] is \[-12.13\,kJ\,mo{{l}^{-1}}\]. The enthalpy of ionisation of \[HCN\] will be [BHU 1997] |
| A. | 4.519 kJ |
| B. | 45.10 kJ |
| C. | 451.9 kJ |
| D. | 45.19 kJ |
| Answer» E. | |
| 25. |
For a hypothetic reaction \[A\to B\], the activation energies for forward and backward reactions are 19 kJ/mole and 9 kJ/mole respectively. The heat of reaction is [CBSE PMT 2000] |
| A. | 28 kJ |
| B. | 19 kJ |
| C. | 10 kJ |
| D. | 9 kJ |
| Answer» D. 9 kJ | |
| 26. |
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at \[{{25}^{o}}C\] increases the temperature of 18.94 kg of water by \[{{0.632}^{o}}C\].If the specific heat of water at \[{{25}^{o}}C\] is 0.998 cal/g-deg, the value of the heat combustion of benzoic acid is [CPMT 1999; BHU 2000] |
| A. | 771.1 kcal |
| B. | 871.2 kcal |
| C. | 881.1 kcal |
| D. | 981.1 kcal |
| Answer» B. 871.2 kcal | |
| 27. |
For which one of the following reactions, \[\Delta H\] is not equal to \[\Delta E\] [IIT JEE 1995] |
| A. | \[{{H}_{2(g)}}+{{I}_{2(g)}}\]⇌ \[2H{{I}_{(g)}}\] |
| B. | \[{{C}_{(s)}}+{{O}_{2(g)}}\]⇌\[C{{O}_{2(g)}}\] |
| C. | \[{{N}_{2(g)}}+3{{H}_{2(g)}}\]⇌\[2N{{H}_{3(g)}}\] |
| D. | \[HC{{l}_{(aq)}}+NaO{{H}_{(aq)}}\]⇌\[NaC{{l}_{(aq)}}+{{H}_{2}}O\] |
| Answer» D. \[HC{{l}_{(aq)}}+NaO{{H}_{(aq)}}\]⇌\[NaC{{l}_{(aq)}}+{{H}_{2}}O\] | |
| 28. |
Hess law deals with [BHU 1979] |
| A. | Changes in heat of reaction |
| B. | Rate of reaction |
| C. | Equilibrium constant |
| D. | Influence of pressure on volume of a gas |
| Answer» B. Rate of reaction | |
| 29. |
?The quantity of heat which must be supplied to decompose a compound into its element is equal to the heat evolved during the formation of that compound from the elements.? This statement is known as |
| A. | Hess's law |
| B. | Joule's law |
| C. | Le?chatelier's principle |
| D. | Lavoiser and Laplace law |
| Answer» E. | |
| 30. |
Mechanical work is specially important in system that contain [Kerala (Med.) 2002] |
| A. | Solid-liquid |
| B. | Liquid-liquid |
| C. | Solid-solid |
| D. | Amalgam |
| E. | Gases |
| Answer» F. | |
| 31. |
The heat required to raise the temperature of a body by 1 K is called [AIEEE 2002] |
| A. | Specific heat |
| B. | Thermal capacity |
| C. | Water equivalent |
| D. | None of these |
| Answer» C. Water equivalent | |
| 32. |
A Beckmann thermometer is used to measure [Kurukshetra CEE 2002] |
| A. | High temperature |
| B. | Low temperature |
| C. | Normal temperature |
| D. | All temperature |
| Answer» C. Normal temperature | |
| 33. |
The heat of neutralization of a strong acid by a strong base is nearly equal to [MP PET 1993; BCECE 2005] |
| A. | + 57.32 J |
| B. | ? 57.32 kJ |
| C. | + 13.7 J |
| D. | ? 13.7 kJ |
| Answer» C. + 13.7 J | |
| 34. |
For an endothermic reaction where \[\Delta H\] represents the enthalpy of the reaction in kJ/mole, the minimum value for the energy of activation will be [IIT JEE 1992; MP PET 1993] |
| A. | Less than \[\Delta H\] |
| B. | Zero |
| C. | More than \[\Delta H\] |
| D. | Equal to \[\Delta H\] |
| Answer» D. Equal to \[\Delta H\] | |
| 35. |
The amount of heat measured for a reaction in a bomb calorimeter is [AIIMS 1991] |
| A. | \[\Delta G\] |
| B. | \[\Delta H\] |
| C. | \[\Delta E\] |
| D. | \[P\Delta V\] |
| Answer» D. \[P\Delta V\] | |
| 36. |
Which of the following gas has the highest heat of combustion |
| A. | Methane |
| B. | Ethane |
| C. | Ethylene |
| D. | Acetylene |
| Answer» C. Ethylene | |
| 37. |
Heat of reaction at constant volume is measured in the apparatus |
| A. | Bomb calorimeter |
| B. | Calorimeter |
| C. | Pyknometer |
| D. | Pyrometer |
| Answer» B. Calorimeter | |
| 38. |
The enthalpies of formation of \[A{{l}_{2}}{{O}_{3}}\] and \[C{{r}_{2}}{{O}_{3}}\] are \[-1596\,kJ\] and \[-1134\,kJ\] respectively. \[\Delta H\] for the reaction \[2Al+C{{r}_{2}}{{O}_{3}}\to 2Cr+A{{l}_{2}}{{O}_{3}}\] is [KCET 2003] |
| A. | \[-2730\,kJ\] |
| B. | \[-462\,kJ\] |
| C. | \[-1365\,kJ\] |
| D. | \[+\,2730\,kJ\] |
| Answer» C. \[-1365\,kJ\] | |
| 39. |
Which of the following would be expected to have the largest antropy per mole [MP PMT 2004] |
| A. | \[S{{O}_{2}}C{{l}_{2}}(s)\] |
| B. | \[S{{O}_{2}}C{{l}_{2}}(g)\] |
| C. | \[S{{O}_{2}}C{{l}_{2}}(l)\] |
| D. | \[S{{O}_{2}}(g)\] |
| Answer» E. | |
| 40. |
The total amount of energy in the universe is fixed, but [AMU (Engg.) 1999] |
| A. | Disorder is increasing |
| B. | Lightning is increasing |
| C. | Matter is increasing |
| D. | Gravitation is decreasing |
| Answer» B. Lightning is increasing | |
| 41. |
For a reaction to occur spontaneously [CBSE PMT 1995] |
| A. | \[(\Delta H-T\Delta S)\] must be negative |
| B. | \[(\Delta H+T\Delta S)\] must be negative |
| C. | \[\Delta H\] must be negative |
| D. | \[\Delta S\] must be negative |
| Answer» B. \[(\Delta H+T\Delta S)\] must be negative | |
| 42. |
For a reaction \[\Delta H=9.08\,kJ\,mo{{l}^{-1}}\] and \[\Delta S=35.7\,J{{K}^{-1}}mo{{l}^{-1}}\] Which of the following statements is correct for the reaction [AMU (Engg.) 2000] |
| A. | Reversible and Isothermal |
| B. | Reversible and Exothermic |
| C. | Spontaneous and Endothermic |
| D. | Spontaneous and Exothermic |
| Answer» D. Spontaneous and Exothermic | |
| 43. |
For conversion C (graphite) ® C (diamond) the \[\Delta S\] is [MP PMT 2001; MP PET 2003] |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | Unknown |
| Answer» D. Unknown | |
| 44. |
In which of the following entropy decreases ? [CPMT 1988, 94; MP PMT 2000] |
| A. | Crystallization of sucrose from solution |
| B. | Rusting of iron |
| C. | Melting of ice |
| D. | Vaporization of camphor |
| Answer» B. Rusting of iron | |
| 45. |
Enthalpy of solution of \[NaOH\] (solid) in water is \[-41.6\,kJ\,mo{{l}^{-1}}\]. When \[NaOH\] is dissolved in water, the temperature of water [UPSEAT 2004] |
| A. | Increase |
| B. | Decreases |
| C. | Does not change |
| D. | Fluctuates indefinitely |
| Answer» B. Decreases | |
| 46. |
The enthalpy change for the reaction of 50.00 ml of ethylene with 50.00 ml of \[{{H}_{2}}\] at 1.5 atm pressure is \[\Delta H=-0.31\,kJ\]. The value of \[\Delta E\] will be [DPMT 2004] |
| A. | ?0.3024 kJ |
| B. | 0.3024 kJ |
| C. | 2.567 kJ |
| D. | ?0.0076 kJ |
| Answer» B. 0.3024 kJ | |
| 47. |
Two mole of an ideal gas is expanded isothermally and reversibly from 1 litre ot 10 litre at \[300K\]. The enthalpy change (in \[kJ\]) for the process is [IIT JEE (Screening) 2004] |
| A. | 11.4 kJ |
| B. | ?11.4 kJ |
| C. | 0 kJ |
| D. | 4.8 kJ |
| Answer» D. 4.8 kJ | |
| 48. |
Adsorption of gases on solid surface is generally exothermic because [IIT JEE (Screening) 2004] |
| A. | Enthalpy is positive |
| B. | Entropy decreases |
| C. | Entropy increases |
| D. | Free energy increase |
| Answer» C. Entropy increases | |
| 49. |
Which of the following would be expected to have the largest antropy per mole [MP PMT 2004] |
| A. | \[S{{O}_{2}}C{{l}_{2}}(s)\] |
| B. | \[S{{O}_{2}}C{{l}_{2}}(g)\] |
| C. | \[S{{O}_{2}}C{{l}_{2}}(l)\] |
| D. | \[S{{O}_{2}}(g)\] |
| Answer» E. | |
| 50. |
Following reaction occurring in an automobile \[2{{C}_{8}}{{H}_{18}}(g)+25{{O}_{2}}(g)\to 16C{{O}_{2}}(g)+18{{H}_{2}}O(g).\] The sign of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be [CBSE PMT 1994; KCET 1999] |
| A. | +, ?, + |
| B. | ?, +, ? |
| C. | ?, +, + |
| D. | +, +, ? |
| Answer» C. ?, +, + | |