InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For an ideal gas, the value of `((dU)/(dV))_(T)` is:A. positiveB. zeroC. negativeD. interchangeable |
| Answer» Correct Answer - B | |
| 2. |
The amount of heat liberated when one mole of `NH_(4)OH` reacts with one mole of HCl isA. 13.7 kcalB. more than 13.7 kcalC. less than 13.67 kcalD. cannot e predicted. |
| Answer» Correct Answer - C | |
| 3. |
Assertion (A): The enthalpy of formation of `H_(2)O(l)` is greater than that of `H_(2)O(g)`. Reason (R ) : Enthalpy change is negative for the condensation reaction `H_(2)O(g) rarr H_(2)O(l)`.A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false. |
| Answer» Correct Answer - A | |
| 4. |
Assertion (A): For a particular reaction, heat of combustion at constant pressure `(q_(P))` is always greater than that at constant volume `(q_(V))`. Reason (R ) : Combustion reactions are invariably accomplished by increase in number of moles.A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false. |
| Answer» Correct Answer - D | |
| 5. |
Statement -1: heat of neutralistion of perchoric acid `,HClO_(4)` with NaOH is same as that of Hcl with NaOH . Statement -2: Both HCl and `HClO_(4)` are strong acidA. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false. |
| Answer» Correct Answer - A | |
| 6. |
Assertion (A): The enthalpy of both graphite and diamond is taken to be zero, being elementary substances Reason (R ) : The enthalpy of formation of an elementary substance in any state is taken as zero.A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false. |
| Answer» Correct Answer - D | |
| 7. |
The enthalpy of formation of organic compounds are conveniently determined from their:A. `-286.0`B. `-143.0`C. `286.0`D. `143.0` |
| Answer» Correct Answer - C | |
| 8. |
Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of graphite is lower than that of diamond.A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false. |
| Answer» Correct Answer - B | |
| 9. |
The enthalpy change for the reaction `2C("graphite")+3H_(2)(g)rarrC_(2)H_(6)(g)` is calledA. enthalpy of formationB. enthalpy of combustionC. enthalpy of hydroenationD. enthalpy of vaporisation |
| Answer» Correct Answer - A | |
| 10. |
A thermodynamic quantity is thatA. which is used in thermochemistryB. which obeys all laws of thermodynamicsC. quantity whose value depends only upon the state of the systemD. quantity which is used in mesuring thermal change |
| Answer» Correct Answer - C | |
| 11. |
Thermodynamic is concerned withA. total energy of a sytemB. energy chagnes in a systemC. rate of a chemcial changeD. mass changes in nuclear reactions |
| Answer» Correct Answer - B | |
| 12. |
Given : `S_((s))+(3)/(2)O_(2(g))rarrSO_(3(g)+2X Kcal` `SO_(2(s))+(1)/(2)O_(2(g))rarrSO_(3(g)+Y Kcal` The heat of formation of `SO_(2)` is `:-`A. `y-2x`B. `2x+y`C. `x+y`D. `2x//y` |
| Answer» Correct Answer - A | |
| 13. |
Which plot represents for an exothermic reaction ?A. B. C. D. |
| Answer» Correct Answer - A | |
| 14. |
If `x` and `y` are arbitrary intensive variables, thenA. xy is an intensive variableB. x/y is an intesive variableC. (x+y) is an extensive propertyD. dx/dy is an intensive property. |
| Answer» Correct Answer - A::B::D | |
| 15. |
Which is intensive property ?A. massB. Mass/volumeC. VolumeD. volume/mass |
| Answer» Correct Answer - B::D | |
| 16. |
Which one of the following is a state property/function?A. HeatB. WorkC. Internal energyD. Potential energy |
| Answer» Correct Answer - C | |
| 17. |
Which of the following is an extensive property?A. EnthalpyB. concentrationC. densityD. viscosity |
| Answer» Correct Answer - A | |
| 18. |
For an adiabatic process, which of the following relations is correct?A. `DeltaE=0`B. `PDeltaV=0`C. `q=0`D. `q=+w` |
| Answer» Correct Answer - C | |
| 19. |
ltBrgt Match the physical changes in List-I with their relations given in List-II:A. `{:(A,B,C,D),("ii","i","iv","iii"):}`B. `{:(A,B,C,D),("i","ii","iii","iv"):}`C. `{:(A,B,C,D),("iv","iii","ii","i"):}`D. `{:(A,B,C,D),("i","ii","iv","iii"):}` |
| Answer» Correct Answer - A | |
| 20. |
Given that `Deltah_(f)(H)=218 kJ//mol`. Express the `H-H` bond energy in `K cal//mol`A. 52.15B. 911C. 109D. 5.2153 |
| Answer» Correct Answer - C | |
| 21. |
Following enthalpy changes are given: `alpha-Dglucose (s) rarr alpha-D glucoes (aq), DeltaH = 10.72 kJ` `beta-D glucose (s) rarrbeta-D glucose(aq), DeltaH = 4.68kJ` `alpha-D glucose (aq) rarr beta-D glucose(aq), DeltaH =1.16 kJ` Calculate enthalpy change in `alpha-D glucose (s) rarr beta-D glucose (s)`A. `14.24kJ`B. `16.56kJ`C. `-7.2kJ`D. `4.88kJ` |
| Answer» Correct Answer - D | |
| 22. |
For an exothermic reaction, `DeltaH` is positive.`(True"/"False)`A. positiveB. negativeC. zeroD. may be positive or negative |
| Answer» Correct Answer - B | |
| 23. |
Match the list-I with list-II and select the correct answer from the given codes: .A. I-C,II-B,III-D,IV-AB. I-B,II-CltIII-D,IV-AC. I-A,II-B,III-C,IV-DD. I-D,II-A,III-B,IV-C |
| Answer» Correct Answer - A | |
| 24. |
(A) As temperature increases, heat of reaction also increases for exothermic as well as endothermic reactions. ltBrgt (R) `DeltaH_("reaction")` varies according to the relation: `(DeltaH_(2)-DeltaH_(1))/(T_(2)-T_(1))=DeltaC_(P)`.A. If both (A) and (R) are correct and (R) is the correct explanation for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is correct but (R) is incorrectD. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - D | |
| 25. |
For the reaction shown , which which is closest to the value o f`DeltaH`? `{:(DeltaH_(f)^(@),(KJ.mol^(-1))),(Cr^(3+)(aq),-143),(Ni^(2+) (aq),-54):}` `2Cr^(3+)(aq)+3Ni(s)to2Cr(s)+3Ni^(2+)(aq)`A. 124 kJB. 89 kJC. `-89 kJ`D. `-124 kJ` |
| Answer» Correct Answer - A | |
| 26. |
Which one of the following statement is false?A. Work is a state functionB. Temperature is a state functionC. Work appears at the boundary of the systemD. Change in the state is completely when the initial and final state are specified |
| Answer» Correct Answer - A | |
| 27. |
Althought he dissolution of ammonium chloride in water is an endothermic reaction, even then it is spontaneous because:A. `DeltaH` is positive, `DeltaS` is -veB. `DeltaH` is +ve, `Delta` is zeroC. `DeltaH` is positive, `TDeltaS lt DeltaH`D. `DeltaH` is +ve `DeltaS` is positive and `DeltaH lt TDeltaS` |
| Answer» Correct Answer - D | |
| 28. |
The lattice energy of KCl is 202 kcal/mo. When KCl is dissolved in water 2 kcal/mol is absorbed. If the sol energies of `K^(+) and Cl^(-)` are in the ratio 2:3 then `DeltaH_("hydration")` of `K^+` is:A. `-80kJ//mol`B. `-120kJ//mol`C. `-150kJ//mol`D. `133.3kJ//mol` |
| Answer» Correct Answer - A | |
| 29. |
The standard heat of formation of sodium ions in aqueous solution from the following data: heat of foramtion of `NaOH(aq.)` at `25^(@)C=-470.7kJ` heat of formation of `OH^(-)`(aq.) at `25^(@)C=-228.8kJ` is:A. `-251.9kJ`B. `241.9kJ`C. `-241.9kJ`D. `251.9kJ` |
| Answer» Correct Answer - C | |
| 30. |
The lattice energy of solid `NaCI` is `180 kcal mol^(-1)`. The dissolution of the solid in `H_(2)O` is endothermic to the extent of `1.0 kcal mol^(-1)`. If the hydration energies of `Na^(o+)` and `CI^(Theta)` ions are in the ratio of `6:5` what is the enthalpy of hydration of sodium ion?A. `-85.6kcal//mol`B. `-97.5kcal//mol`C. `82.6kcal//mol`D. `+100kcal//mol` |
| Answer» Correct Answer - B | |
| 31. |
`AB,A_(2)` and `B_(2)` are diatomic molecules. If the bond enthalpies of `A_(2), AB` and `B_(2)` are in the ratio `1:1:0.5` and the enthalpy of formation of `AB` from `A_(2)` and `B_(2)` is `-100kJ mol^(-1)` , what is the bond enthalpy of `A_(2)` ?A. 400 kJ `mol^(-1)`B. 200 kJ `mol^(-1)`C. 100 kJ `mol^(-1)`D. 300 kJ `mol^(-1)` |
| Answer» Correct Answer - A | |
| 32. |
A solution of `200 mL` of `1 M KOH` is added to `200 mL` of `1 M HCl` and the mixture is well shaken. The rise in temperature `T_(1)` is noted. The experiment is repeated by using `100 mL` of each solution and increase in temperature `T_(2)` is again noted. Which of the following is correct?A. `T_(1)=T_(2)`B. `T_(1)=2T_(2)`C. `T_(2)=2T_(1)`D. `T_(1)=4T_2` |
| Answer» Correct Answer - A | |
| 33. |
A change in the free energy of a system at constant temperature and pressure will be: `Delta_(sys)G = Delta_(sys)H -T Delta_(sys)S` At constant temperature and pressure `Delta_(sys) G lt 0` (spontaneous) `Delta_(sys)G = 0` (equilibrium) `Delta_(sys)G gt 0` (non-spontaneous) For a spontaneous reaction `DeltaG`, equilibrium `K` and `E_(cell)^(Theta)` will be, respectivelyA. `-ve, gt 1, +ve`B. `+ve, gt 1 , -ve`C. `-ve, lt 1,-ve`D. `-ve,gt1, -ve` |
| Answer» Correct Answer - A | |
| 34. |
Which of the following equations has/have enthalpy changes equal to `DeltaH_(comb)C`? I. `C(s)+O_(2)(g)toCO_(2)(g)` II. `C(s)+(1)/(2)O_(2)(g)toCO(g)` III. `CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g)`A. I and IIB. I,II and IIIC. I and IIID. I only |
| Answer» Correct Answer - D | |
| 35. |
Which of the following value of `DeltaH_(f)^(@)` represent that the product is least stable ?A. `-94.0kcal" "mol^(-1)`B. `-231.6kcal" "mol^(-1)`C. `+21.4kcal" "mol^(-1)`D. `+64.8kcal" "mol^(-1)` |
| Answer» Correct Answer - D | |
| 36. |
Process, `AtoB` represent:A. isobaricB. isochoricC. isothermalD. adiabatic |
| Answer» Correct Answer - B | |
| 37. |
Which of the following expression is/are correct for a adiabatic process?A. `(T_(2))/(T_(1))=((V_(1))/(V_(2)))^(gamma-1)`B. `(P_(2))/(P_(1))=((T_(1))/(T_(2)))^(gamma-1//gamma)`C. `P_(2)V_(2)^(gamma)=P_(1)V_(1)^(gamma)`D. `P_(1)V_(1)^(gamma-1)=P_(2)V_(2)^(gamma-1)`. |
| Answer» Correct Answer - A::C | |
| 38. |
Entropy change in reversible adiabatic process is:A. infiniteB. zeroC. equal to `C_(V)DeltaT`D. equal to nR ln `((V_(2))/(V_(1)))` |
| Answer» Correct Answer - B | |
| 39. |
Which one of the following is applicable for an adiabatic expansion of ideal gas?A. `DeltaU=0`B. `W=DeltaU`C. `W=-DeltaU`D. `W=0` |
| Answer» Correct Answer - C | |
| 40. |
Assertion (A): When a gas at high pressure expands against vacuum, the work done is maximum. Reason (R ) : Work done in expansion depends upon the pressure inside the gas and increase in volume.A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false. |
| Answer» Correct Answer - D | |
| 41. |
A system is provided with 50 Joules of heat and the work done on they system is 10 Joules. What is the change in internal energy of the system in Joules?A. 60B. 40C. 50D. 10 |
| Answer» Correct Answer - A | |
| 42. |
During isothermal expansion of an ideal gas itsA. internal energy increasesB. enthalpy decreasesC. enthalpy remains unaffectedD. enthalpy reduces to zero |
| Answer» Correct Answer - C | |
| 43. |
Two moles of an ideal gas is expanded isothermally and reversibly from `1` liter to `10` liter at `300 K`. The enthalpy change (in `kJ`) for the processA. 11.4 kJB. `-11.4kJ`C. `0kJ`D. `4.8kJ` |
| Answer» Correct Answer - B | |
| 44. |
Under which of the following condition is the relation `DeltaH = DeltaU +P DeltaV` valid for a closed system atA. constant pressureB. constant pressureC. constant temperature and pressureD. constant temperature, pressure and composition |
| Answer» Correct Answer - C | |
| 45. |
According to equation, `C_(6)H_(6)(l)+15//2 O_(2)(g)rarr 6CO_(2)(g)+3H_(2)O(l), Delta H= -3264.4 "KJ mol"^(-1)` the energy evolved when 7.8 g benzene is burnt in air will be -A. 163.22 kJB. 32.64 kJC. 3.264 kJD. 326.4 kJ |
| Answer» Correct Answer - D | |
| 46. |
Which among the following represents the reaction of formation of the product?A. `C_(("diamond"))+O_(2)(g)toCO_(2)(g)`B. `S_(("monoclinic"))+O_(2)(g)toSO_(2)(g)`C. `2N_(2)(g)+O_(2)(g)to2N_(2)O(g)`D. None of these |
| Answer» Correct Answer - D | |
| 47. |
Which halogen in its standard state has the greatest absolute entropy per mole?A. `F_(2)(g)`B. `Cl_(2)(g)`C. `Br_(2)(l)`D. `I_(2)(s)` |
| Answer» Correct Answer - B | |
| 48. |
Predict the sign of `DeltaS` for each of the following processes, which occur at constant temperature. I. The volume of 2 mol of `O_(2)(g)` increases from 44L to 54L II. The pressure of 2 mol of `O_(2)(g)` increases from 1 atm to 1.2 atm.A. `{:("I","II"),(DeltaS=-ve,DeltaS=-ve):}`B. `{:("I","II"),(DeltaS=-ve,DeltaS=+ve):}`C. `{:("I","II"),(DeltaS=+ve,DeltaS=-ve):}`D. `{:("I","II"),(DeltaS=+ve,DeltaS=+ve):}` |
| Answer» Correct Answer - C | |
| 49. |
Which of the following statements must be true for the entropy o a pure solid to be zero? I. The temperature must be zero kelvin. II. The solid must be perfectly crystalline. III. The solid must be an element IV. The solid must be ionic.A. IB. I and IIC. I, II and IIID. All are correct |
| Answer» Correct Answer - B | |
| 50. |
Statement: The thermodynamics functions which determines the spontaneity of a process is the free energy. For a process to be spontaneous, the change in free energy must be negative. Explanation:The change in free energy is related to the change in enthalpy and change in entropy. the change in entropy for a process must be always positive if it is spontaneous.A. If both (A) and (R) are correct and (R) is the correct explanation for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is correct but (R) is incorrectD. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - C | |