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.
| 51. |
The pressure at `C` isA. 3.284 atmB. 1.642 atmC. 0.0821 atmD. 0.821 atm |
| Answer» Correct Answer - B | |
| 52. |
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) The free enegry for a reaction having `DeltaH = 31400 cal, DeltaS = 32 cal K^(-1) mol^(-1) at 1000^(@)C` isA. `-9336cal`B. `-7386cal`C. `-1936cal`D. `+9336cal` |
| Answer» Correct Answer - A | |
| 53. |
We can drive any thermodynamically forbidden reaction in the desired direction by coupling with:A. highly exothermic reactionB. highly enodthermic carbonC. highly exergonic reactionD. highly endergonic reaction |
| Answer» Correct Answer - C | |
| 54. |
For a phase change: `H_(2)O(l)hArrH_(2)O(s)` `0^(@)C`, 1 barA. `DeltaG=0`B. `DeltaS=0`C. `DeltaH=0`D. `DeltaU=0` |
| Answer» Correct Answer - A | |
| 55. |
The pressures at `A` and `B` in the atmosphere are, respectively,A. 0.821 and 1.642B. 1.642 and 0.821C. 1 and 2D. 0.082 and 0.164 |
| Answer» Correct Answer - A | |
| 56. |
Q. Work doen in the process `C to A` is:A. zeroB. 8.21 L atmC. 16.2 L atmD. unpredictable |
| Answer» Correct Answer - B | |
| 57. |
Q. The process which occurs in going from `BtoC` is:A. isothermalB. adiabaticC. isobaricD. isochoric |
| Answer» Correct Answer - C | |
| 58. |
The diagram below shows the heat of reaction between `N_(2),O_(2) NO and NO_(2)`: Which of the following statements pertaining to the formation of `NO and NO_(2)` are correct? 1. The standard heat of formation of `NO_(2)` is 68 kJ `mol^(-1)` 2. `NO_(2)` is formed faster than NO at higher temperature. 3. The oxidation reaction of nitrogen to `NO_(2)` is endothermic. 4. These two reactions often take place in troposphere and causes green house effect. 5. These two reactions often take place and are responsible for city smog.A. 1 and 2B. 1 and 3C. 1 and 4D. 3 and 5 |
| Answer» Correct Answer - D | |
| 59. |
Assertion (A): The enthalpy of formation of `HCI` is equal to the bond energy of `HCI`. Reason (R ) : The enthalpy of formation and the bond enegry both involve formation of one mole of `HCI` from the elements.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 | |
| 60. |
For the process `NH_(3)(g) +HCI(g) rarr NH_(4)CI(s)`A. `DeltaH=+ve,DeltaS=+ve`B. `DeltaH=-ve,DeltaS=+ve`C. `DeltaH=+ve,DeltaU=-ve`D. `DeltaH=-ve,DeltaS=-ve` |
| Answer» Correct Answer - D | |
| 61. |
Which of the following expressions is correct?A. `DeltaG^(@)=nFE^(@)`B. `DeltaG^(@)=-nFE^(@)`C. `DeltaG^(@)=2.303RTnFE_(cell)^(@)`D. `DeltaG^(@)=nFlogK_(c)` |
| Answer» Correct Answer - A | |
| 62. |
Select the correct expressions among the following:A. `(DeltaG-DeltaH)/(T)=((delG)/(delT))_(P)`B. `(DeltaG-DeltaH)/(T)=[(del(DeltaG))/(delT)]_(V)`C. `(DeltaS)/(nF)=((delE_("Cell"))/(delT))_(P)`D. `((delT)/(delP))_(H)=-((delH)/(delP))_(T//C_(P))`. |
| Answer» Correct Answer - A::C::D | |
| 63. |
Which of the following are correct for an idealg as?A. `((delU)/(delV))_(T)=0`B. `((delH)/(delP))_(T)=0`C. `((delT)/(delP))_(H)=0`D. `((delP)/(delT))_(V)=0` |
| Answer» Correct Answer - A::B::C | |
| 64. |
For the reaction (i) `H_(2)(g)+Cl_(2)(g)=2HCl(g)+xkJ` (ii). `H_(2)(g)+Cl_(2)(g)=2HCl(l)+ykJ` which one of the following statements is correct?A. `x gt y`B. `x lt y`C. `x-y=0`D. `x=y` |
| Answer» Correct Answer - B | |
| 65. |
The heat of formation `(DeltaH_(f)^(@))` of `H_(2)O(l)` is equal to :A. zeroB. molar heat of combustion of `H_(2)(l)`C. Molar heat of combustion of `H_(2)(g)`D. sum of heat of formation of `H_(2)O(g) and O_(2)(g)` |
| Answer» Correct Answer - C | |
| 66. |
The value of entropy in the universe isA. constant pressureB. decreasingC. increasingD. zero |
| Answer» Correct Answer - C | |
| 67. |
Which of the following is correct?A. `C_(V)=((delU)/(delT))_(P)`B. `C_(P)=((delH)/(delT))_(V)`C. `C_(P)-C_(V)=R`D. `((delU)/(delV))_(t)=(-a)/(V^(2))` |
| Answer» Correct Answer - C | |
| 68. |
For the reversible process, the value of `DeltaS` is given by the expression:A. `(q_(rev))/(T)`B. `T-q_(rev)`C. `q_(rev)xxT`D. `q_(rev)-T` |
| Answer» Correct Answer - A | |
| 69. |
Which reaction occurs with the greatest increase in entropy?A. `2H_(2)O(l)to2H_(2)(g)+O_(2)(g)`B. `2NO(g0toN_(2)(g)+O_(2)(g)`C. `C(s)+O_(2)(g)toCO_(2)(g)`D. `Br_(2)(g)+Cl_(2)(g)to2BrCl(g)`. |
| Answer» Correct Answer - A | |
| 70. |
Which of the following represents total kinetic energy of one mole of gas?A. `(1)/(2)RT`B. `(3)/(2)RT`C. `(C_(P)-C_(V))RT`D. `(2)/(3)RT` |
| Answer» Correct Answer - B | |
| 71. |
In which reaction there will be increase in entropy ?A. `Na(s)+H_(2)O(l)toNaOH(aq)+(1)/(2)H_(2)(g)uarr`B. `Ag^(+)(aq)+Cl^(-)(aq)toAgCl(s)`C. `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)`D. `Cu^(2+)(aq)+4NH_(3)(g)to[Cu(NH_(3))_(4)]_((aq))^(2+)` |
| Answer» Correct Answer - A | |
| 72. |
The incorrect expression among the following isA. `(DeltaG_("system"))/(DeltaS_("total"))=-T`B. In isothermal process `w_(("reversible"))=-nRT((V_(f))/(V_(i)))`C. ln `K=(DeltaH^(@)-TDeltaS^(@))/(RT)`D. `K=e^(-DeltaG^(@)//RT)` |
| Answer» Correct Answer - C | |
| 73. |
The species which by definition has zero standard molar enthalpy of formation at `298K` isA. `Br_(2)(g)`B. `Cl_(2)(g)`C. `H_(2)O(g)`D. `CH_(4)(g)` |
| Answer» Correct Answer - B | |
| 74. |
In which of the following neutralization reaction, the heat of neutralization will be highest?A. HCl and NaOHB. `CH_(3)COOH and NaOH`C. `CH_(3)COOH and NH_(3)OH`D. `HCl and NH_(4)OH` |
| Answer» Correct Answer - A | |
| 75. |
For a gaseous reaction, `A(g)+3B(g)to3C(g)+3D(g),DeltaD` is 17 kcal at `27^(@)C`. Assuming `R=2cal" "K^(-1)mol^(-1)`, the value of `DeltaH` for the above reaction is:A. 15.8 kcalB. 18.2 kcalC. 20.0 kcalD. 16.4 kcal |
| Answer» Correct Answer - B | |
| 76. |
Enthalpy of neutralization of a strong acid by strong base: (1) has a contant value of -57.32 kJ (2) is independent of the nature of strong acid and strong base (3) result in heat change accompanied by the reaction `H^(+)(aq)+OH^(-)(aq)toH_(2)O`A. 1 and 2B. 1 and 3C. 1 onlyD. 1,2 and 3 |
| Answer» Correct Answer - D | |
| 77. |
Energy required to dissociate `4g` of gaseous hydrogen into free gaseous atoms is `208Kcal` at `25^(@)C` The bond energy of `H-H` bond will beA. 1.04 calB. 10.4 kcalC. 104 kcalD. 1040 kcal |
| Answer» Correct Answer - C | |
| 78. |
When 10 mL of a strong acid is added to 10 mL of an alkali, the temperature rises by `5^(@)C`. If 100 mL of the same acid si mixed with 100 mL of the same base, the temperature rise would be:A. `5^(@)C`B. `50^(@)C`C. `20^(@)C`D. cannot be predicted. |
| Answer» Correct Answer - A | |
| 79. |
Reaction, `H_(2)(g)+I_(2)(g)to2HI,DeltaH=12.40kcal` ltbr. According to this, heat of formation of HI will be:A. `12.40 kcal`B. `-12.4kcal`C. `-6.20kcal`D. `6.20kcal` |
| Answer» Correct Answer - D | |
| 80. |
The standard heats of formation at 298K for `C Cl_(4)(g),H_(2)O(g),CO_(2)(g) and HCl(g)` are `-25.5,-57.8,-94.1 and -22.1` kcal `mol^(-1)` respectively. Calculate `DeltaH_(298)^(@)` for the reaction. `C Cl_(4)(g)+2H_(2)O(g)toCO_(2)(g)+4HCl(g)`.A. 36.4kJB. 20.7kJC. `-20.7kJ`D. `-41.4kJ` |
| Answer» Correct Answer - D | |
| 81. |
A process in which volume remians constant is calledA. isochoric processB. isothermal processC. adiabatic processD. isobaric process. |
| Answer» Correct Answer - A | |
| 82. |
Assertion (A): Heat of neutralisation for both `HNO_(3)` and `HCI` with `NaOH` is `53.7 kJ per mol^(-1)`. Reason (R ) : `NaOH` is a strong electrolyte/base.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 | |
| 83. |
A process in which the system does not exchange heat with the surroundings is known asA. isothermalB. isobaricC. isochoricD. adiabatic |
| Answer» Correct Answer - D | |
| 84. |
(A) For reaction ltBrgt `2NH_(3)(g)toN_(2)(g)+3H_(2)(g)," "DeltaHgtDeltaE` (R) Enthalpy change is always greater than internal energy change.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 - C | |
| 85. |
Assertion (A): Decrease in free energy causes spontaneous reaction Reason (R ) : Spontaneous reactions are invariably exothermic.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 - C | |
| 86. |
Assertion (A): A reaction which is spontaneous and accompained by decreases of randomness must be exothermic. Reason (R ) : All exothermic reactions are accompained by decrease of randomness.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 - C | |
| 87. |
Assertion (A): An exothermic process, non-spontaneous at high temperature, may become spontaneous at low temperature. Reason (R ) : With decrease in temperature, randomness (entropy) decreases.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 | |
| 88. |
One mole of a non-ideal gas undergoes a change of state `(2.0atm,3.0L,95K)rarr(4.0atm,5.0L,245K)` With a change in internal energy `DeltaE=30L` atm. The change in enthalpy `(DeltaH)` in the process in `L`-atm isA. 40B. 42.4C. 44D. not defined, because pressure is not constant. |
| Answer» Correct Answer - C | |
| 89. |
If the enthalpy of vaporisation of water is `186.5 J mol^(-1)`, then entropy of its vaporisation will beA. 0.5B. 1C. 1.5D. 2 |
| Answer» Correct Answer - A | |
| 90. |
The change in Gibbs free energy `(DeltaG)` of the system along provides a criterion for the spontaneity of a process at constant temperature and pressure. A change in the free energy of a system at constant temperature and pressure will be: `DeltaG_("system")=DeltaH_("system")-TDeltaS_("system")` At constant temperature and pressure: `DeltaG_("system")lt0` (Spontaneous) `DeltaG_("system")=0` (equilibrium) `DeltaG_("system")gt0` (non-spontaneous) Free energy is related to the equilibrium constant as: `DeltaG^(@)=2.303RTlog_(10)K_(e)`. Q. If b oth `DeltaH and DeltaS` are negative, the reaction will be spontaneous:A. at high temperatureB. at low temperatureC. at all temperatureD. at absolute zero |
| Answer» Correct Answer - C | |
| 91. |
The change in Gibbs free energy `(DeltaG)` of the system along provides a criterion for the spontaneity of a process at constant temperature and pressure. A change in the free energy of a system at constant temperature and pressure will be: `DeltaG_("system")=DeltaH_("system")-TDeltaS_("system")` At constant temperature and pressure: `DeltaG_("system")lt0` (Spontaneous) `DeltaG_("system")=0` (equilibrium) `DeltaG_("system")gt0` (non-spontaneous) Free energy is related to the equilibrium constant as: `DeltaG^(@)=2.303RTlog_(10)K_(e)`. Q. A reaction has positive values of `DeltaH and DeltaS`. From this you can deduce that the reaction:A. must be spontaneous at any temperature.B. cannot be spontaneous at any temperature.C. Will be spontaneous only at low temperatureD. will be spontaneous only at high temperature. |
| Answer» Correct Answer - D | |
| 92. |
Standard entropy of `X_(2)` , `Y_(2)` and `XY_(3)` are `60, 40 ` and `50JK^(-1)mol^(-1)` , respectively. For the reaction, `(1)/(2)X_(2)+(3)/(2)Y_(2)rarrXY_(3),DeltaH=-30KJ` , to be at equilibrium, the temperature will be:A. 750 KB. 1000 KC. 1250 KD. 500 K |
| Answer» Correct Answer - A | |
| 93. |
For the two equations given below: `H_(2)(g)+1//2O_(2)(g)toH_(2)O(l)+x_(1)kJ` `H_(2)(g)+1//2O_(2)(g)toH_(2)O(g)+x_(2)kJ` Select the correct answer:A. `x_(1) gt x_2`B. `x_(2) gt x_(1)`C. `x_(1)=x_(2)`D. `x_(1)+x_(2)=0` |
| Answer» Correct Answer - A | |
| 94. |
The bond dissociation energy of C-H in `CH_(4)` from the equation `C(g)+4H(g)toCH_(4)(g)," "DeltaH=-397.8kcal` is:A. `+99.45kcal`B. `-99.45kcal`C. `+397.8kcal`D. `+198.9kcal` |
| Answer» Correct Answer - A | |
| 95. |
If `S+O_(2)toSO_(2),DeltaH=-298.2 " kJ" " mole"^(-1)` `SO_(2)+(1)/(2)O_(2)toSO_(3)DeltaH=-98.7 " kJ" " mole"^(-1)` `SO_(3)+H_(2)OtoH_(2)SO_(4),DeltaH=-130.2 " kJ" " mole"^(-1)` `H_(2)+(1)/(2)O_(2)toH_(2)SO_(4),DeltaH=-287.3 " kJ" " mole"^(-1)` the enthlapy of formation of `H_(2)SO_(4)` at 298 K will beA. `-754.4kJ`B. `+320.5kJ`C. `-650.3kJ`D. `-433.7kJ` |
| Answer» Correct Answer - A | |
| 96. |
Given `C_(s)+O_(2(g))toCO_(2(g)),DeltaH=-94.2K cal` `H_(2(g))+½O_(2(g))toH_(2)O_((g)),Delta=-68.3K cal` `CH_(4(g))+2O_(2(g))to2H_(2)O+CO_(2)=-210.8K cal` what will be heat of formation of ` CH_(4)` in (Kcal) ?A. 45.9B. 47.8C. 20D. 47.3 |
| Answer» Correct Answer - C | |
| 97. |
The heats evolved in combustion of rhombic and monoclinic sulphur are, respectively, `70960` and `71030cal mol^(-1)`. What will be the heat of conversion of rhomic sulphur to monoclinic?A. `-70960cal`B. `-71030cal`C. 70calD. `-70cal` |
| Answer» Correct Answer - C | |
| 98. |
Given `C(s)+O_(2)(g)toCO_(2)(g)`, `DeltaH=-395 kJ` `S(s)+O_(2)(g)toSO_(2)(g)`, `DeltaH=-295 kJ` `CS_(2)(l)+3O_(2)(g)toCO_(2)(g)+2SO_(2)(g)`, `DeltaH=-1110 kJ` The heat of formation of `CS_(2)(l)` isA. 250 kJB. 62.5 kJC. 31.25 kJD. 125 kJ |
| Answer» Correct Answer - D | |