InterviewSolution
Saved Bookmarks
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 principle on conductometric titration is based in the fact that during the titration, one of the ions is replaced by the other and invariably thses two ions differ in the ionic conductivity with the result that the conductivity of the solution varies during the course of the titration.Take,for example,the titration between strong acid, say HCl. and a strong base, say NaOH.Before NaOH is added the conuctance of HCl solution has a high value due ti the persence if highly hydrogen ions.As NaOH is added,`H^(+)` ions are the replaced by relatively slower moving `Na^(+)` ions.Consequently, the conductance of the solution decrease and this continues right upto the enuivalence point where the solution contains only NaCL.Beyond the equivalence point if more of NaOH is added, then the solution contains an excess of the fast moving `OH^(-)` with the result that its as more of NaoH added, we plot the conductance value vs the amount of NaOH added we get curve of the type shown in figure.The descending portion AB represents the conductance before the equivalence point (solution cintains a mixture if acid HCl and the salt NaCL and the ascending portion CD represents the conductances after the equivalence point (solution contains the salt NaCL and the excess of NaOH). The point E which repersents only the minimum conductance is alkali and thus repersents the equivalence point.This point can, however, be obtained by the extrapoltion of the lines AB and CD and therefore one is not very particular in location this point experimentally as it is in the case of ordinary acid -base involving the acid base indicators LET us take the specific exaanple of acetic acid being titration against NaOH.Before the addition the of alkali, the solution shows poor conductance due to feeble inization of acetic acid.Initially the addtion of alkali causes not only the replacement of `H^(+)` by `Na^(+)` but also suppresses the thus the conductance of the solution decrease in the begnning .But very soon the conductance starts increasing as addetion NaOH thus causing neutralizes the undissociated HAc to HAc with strong condutance eletroyte `Na^(+)Ac^(-)`.The increase in conducting `OH^(-)` ions gtthe graph near the highly equivalence point actual equivalence point can as usual be ontained by the extrapoiation method In all thses graphs it been assumed that the vloume change due addition of solution from burette in negligible heane vloume change of the sloution in beaker the conuctance of which is measured is almost constant throughout the measurement The most appropriate titration curve ibtained when a mixture of a strong acid (say HCl) and a weak acid (say`CH_(3)`COOH0 is titration with (say NaOH) will beA. B. C. D. |
|
Answer» Correct Answer - C |
|
| 52. |
The principle on conductometric titration is based in the fact that during the titration, one of the ions is replaced by the other and invariably thses two ions differ in the ionic conductivity with the result that the conductivity of the solution varies during the course of the titration.Take,for example,the titration between strong acid, say HCl. and a strong base, say NaOH.Before NaOH is added the conuctance of HCl solution has a high value due ti the persence if highly hydrogen ions.As NaOH is added,`H^(+)` ions are the replaced by relatively slower moving `Na^(+)` ions.Consequently, the conductance of the solution decrease and this continues right upto the enuivalence point where the solution contains only NaCL.Beyond the equivalence point if more of NaOH is added, then the solution contains an excess of the fast moving `OH^(-)` with the result that its as more of NaoH added, we plot the conductance value vs the amount of NaOH added we get curve of the type shown in figure.The descending portion AB represents the conductance before the equivalence point (solution cintains a mixture if acid HCl and the salt NaCL and the ascending portion CD represents the conductances after the equivalence point (solution contains the salt NaCL and the excess of NaOH). The point E which repersents only the minimum conductance is alkali and thus repersents the equivalence point.This point can, however, be obtained by the extrapoltion of the lines AB and CD and therefore one is not very particular in location this point experimentally as it is in the case of ordinary acid -base involving the acid base indicators LET us take the specific exaanple of acetic acid being titration against NaOH.Before the addition the of alkali, the solution shows poor conductance due to feeble inization of acetic acid.Initially the addtion of alkali causes not only the replacement of `H^(+)` by `Na^(+)` but also suppresses the thus the conductance of the solution decrease in the begnning .But very soon the conductance starts increasing as addetion NaOH thus causing neutralizes the undissociated HAc to HAc with strong condutance eletroyte `Na^(+)Ac^(-)`.The increase in conducting `OH^(-)` ions gtthe graph near the highly equivalence point actual equivalence point can as usual be ontained by the extrapoiation method In all thses graphs it been assumed that the vloume change due addition of solution from burette in negligible heane vloume change of the sloution in beaker the conuctance of which is measured is almost constant throughout the measurement the nature of curve obtained for the titration between weak acid vs strong base as described in the above will beA. B. C. D. |
|
Answer» Correct Answer - A |
|
| 53. |
In two different experiments, equilibrium `A(g) hArr B(g)` is established by initially taking reactant only. In first experiment, reaction is carried out in absence of catalyst and in second experiment reaction is carried out in presence of catalyst, then, which of the following curve of rate us time for forward and backward reaction hold true in these two experiments ?A. B. C. D. |
|
Answer» Correct Answer - A |
|
| 54. |
Given P-X curve for a non-ideal liquid mixture (fig). Identify the correct T-X curve for the same mixture. A. B. C. D. |
|
Answer» Correct Answer - B |
|
| 55. |
The curve shown results when a liquid is cooled. What temperature is closest to the freezing point of the liquid ? A. LB. MC. `(L+M)/(2)`D. `(M+N)/(2)` |
|
Answer» Correct Answer - B |
|
| 56. |
According to the solubility curve shown, how many grams of solute can be recrystallized when 20 mL of a saturated solution at `60^(@)C` are cooled to `0^(@)C` ? A. `7.0`B. 12C. 25D. 35 |
|
Answer» Correct Answer - A |
|
| 57. |
P-V plot for two gases (assuming ideal) during adiabatic processes are given in the figure. Plot A and plot B should correspond respectively to : A. He and `H_(2)`B. `H_(2)` and HeC. He and NeD. `H_(2)` and `CI_(2)` |
|
Answer» Correct Answer - B |
|
| 58. |
Which of the following graphs are correct ?A. B. C. D. |
|
Answer» Correct Answer - B::C |
|
| 59. |
According to the Arrhenius equation `k = Ae^(-E_(a)//RT)` a plot of ln k against `1//T` yields:A. `E_(a)` as the slope and A as the interceptB. `E_(a)//R` as the slope and A as the inerceptC. `E_(a)//R` as the slope and ln A as the interceptD. `-E_(a)//R` as the slope and ln A as the intercept |
|
Answer» Correct Answer - D |
|
| 60. |
What is the order of a reaction that produces the graphs shown ? A. Zero orderB. First orderC. Second orderD. Some other order |
|
Answer» Correct Answer - C |
|
| 61. |
Following reaction can take place in both direction `A overset(k_(1))underset(k_(2))hArr B`. Graph is given for the forward reaction. And for the beackward reaction, following data is obtained: `{:([B],Rate),(0.01M,1 xx 10^(-2)Ms^(-1)),(0.02M,2xx 10^(-2)Ms^(-1)):}` Hence, net reaction rate of B is:A. `=k_(1) [A] - k_(2)[B]`B. `=k_(1) - k_(2)[B]`C. `=k_(1) [A] - k_(2)`D. `=k_(1)-k_(2)` |
|
Answer» Correct Answer - B |
|
| 62. |
For the reactions (i) `A overset(K_(I))rarr P` and (ii) `B overset(K_(II))rarr Q`, following observation is made. Calculate `(K_(I))/(K_(II))` where `K_(I)` and `K_(II)` are rate constants for the respective reaction.A. `2.772`B. 1C. `0.36`D. None of these |
|
Answer» Correct Answer - A |
|
| 63. |
For the reaction `2CI F_(3)(g) harr CI_(2)(g) +3F_(2)(g) log K_(eq) vs (1)/(T)` (where temperature is in K) curve is obtained as given. Which of the following change will increase the concentration of `CI_(2)` in an equilibrium mixture of `CI_(2), F_(2)` and `CIF_(3)`? A. Addition of inert gas at constant pressureB. Increase in temperature at constant volumeC. Addition of catalyst at equilibriumD. Removal of `F_(2)(g)` at equilibrium |
|
Answer» Correct Answer - B::D |
|
| 64. |
Which of the following statement are true regarding the log K vs `1//T`. Plot shown in the given diagram? A. Plot P shows that the energy of activation is independent of temperatureB. Plot Q describes the behaviour of temperature dependence of energy of activationC. Arrhenius behaviour is described by PD. The slope of curve P gives the value `-(E_(a))/(R)` |
|
Answer» Correct Answer - A::B::C::D |
|
| 65. |
For adsorption of a gas on a solid, the plot of log `(x//m)` vs log P is linear with a slope equal to [n being a whole number]:A. KB. log KC. nD. `1//n` |
|
Answer» Correct Answer - D |
|
| 66. |
The pressure P of a gas is plotted against its absolute temperature T for two different constant volumes, `V_(1)` and `V_(2)` (for same no. of moles) where `V_(1) gt V_(2)`, the correct statement is:A. Curves have the same slope and do not intersectB. Curve must intersect at some point other than `T = 0`.C. Curve for `V_(2)` hasa greater slope than that for `V_(1)`D. Curve for `V_(1)` has a greater slope than that for `V_(2)`. |
|
Answer» Correct Answer - C |
|
| 67. |
Consider the given graph: Graph is plotted for 1 mol of gas at 400K, find slope of curve [take: `R = 0.08(L-atm)/(mol-K)]` A. `(32)^(2)`B. `(16)^(2)`C. `(8)^(2)`D. `(4)^(2)` |
|
Answer» Correct Answer - A |
|
| 68. |
What will be the order of reaction and rate constant for a chemical change having log `t_(50%)` vs log concentration of (a) curves as: A. `0,1//2`B. `1,1`C. `2,2`D. `3,1` |
|
Answer» Correct Answer - A |
|
| 69. |
Above graph is plotted for 1 mole of ideal monoatomic gas. Find net heat exchange for the process `BC,"if" (V_(C))/(V_(B))=4/1:`A. `+600 R In 2`B. `-600 R In 2`C. `+1200 R In 2`D. `-1200 R In 2` |
|
Answer» Correct Answer - C |
|
| 70. |
P vs V graph is plotted for 1 mole of hypothetical gas. Range of a/b for this gas in (atm-L/mole). `[R = 0.08 "atm-litre"//-"mle"-K]` A. `54 lt ((a)/(b)) lt 81`B. `27 lt ((a)/(b)) lt 42`C. `40 lt ((a)/(b)) lt 65`D. `13.5 lt ((a)/(b)) lt 40.5` |
|
Answer» Correct Answer - A |
|
| 71. |
For an irreversible process, if P-V graphs are plotted simply to represents the work involved in the process as the area under the P-V curve. Then which of the following options has/have the correct P-V curve for the mentioned process on an ideal gas placed in a cylinder fitted with a piston.A. B. C. D. |
|
Answer» Correct Answer - A::D |
|
| 72. |
A graph plotted between log `t_(50%)` vs log concentration is a straight line. What conclusion can you draw from this graph? A. `n = 1, t_(1//2) prop a`B. `n = 2, t_(1//2) prop (1)/(a)`C. `n = 1, t_(1//2) = (0.693//k)`D. None of the above |
|
Answer» Correct Answer - C |
|
| 73. |
A graph is plotted between uncertainty in position and inverse of uncertainty in wavelength for an electron. We get a straight line passing through origin. Calculate voltage through which electron is accelerated with: A. `150 V`B. `75V`C. `37.5V`D. `300V` |
|
Answer» Correct Answer - C |
|
| 74. |
For a first order reaction: `A_(3) rarr 3A`, Following graph is observed when concentration vs. time graph is plotted. Identify the option which is correct. A. Half life of the reaction will be 20 hrsB. The coordinates of the point of interaction will remain same even if initial concentration is changed.C. Concentration of A will be 3 times that of `A_(3)` in 20 min.D. If the reaction occurs in a rigid container at constant temperature pressure will decrease. |
|
Answer» Correct Answer - B |
|
| 75. |
From the graph of binding energy (B.E.) usmass number plotted as shown, identify the correct option (s). (All the graphs are straight line) A. Order of stability of nucleus is `D lt A lt C lt B`B. If D undergoes breakage to give C and another nucleus then energy will be releasedC. If A and B combine to form D then energy must be suppliedD. If C undergo breakage into two fragements of equal mass number then energy will be released |
|
Answer» Correct Answer - A::B::C |
|
| 76. |
For an ideal gas subjected to different processes as shown by the graphs, select the graph which will involve greatest amount of heat exchange if initial and final temperature are same in all .A. B. C. D. |
|
Answer» Correct Answer - A |
|
| 77. |
An ideal gas is taken around the cycle ABCA as shown in P-V diagram. The net work done by the gas during the cycle is equal to : A. `12 P_(1)V_(1)`B. `6P_(1)V_(1)`C. `5P_(1)V_(1)`D. `P_(1)V_(1)` |
|
Answer» Correct Answer - C |
|
| 78. |
`AgNO_(3)` (aq) was added to an aqueous KCl solution gradually and the conductivity of the solution was measured. The plot of conductance `(^^)` versus the value of `AgNO_(3)` is A. PB. QC. RD. S |
|
Answer» Correct Answer - D |
|
| 79. |
For `O_(2)` gas at `T_(1)` and `T_(2)` following Maxwell speed distribution is observed [not to be scale] Ratio `A_(1)//A_(2)` is equal to |
|
Answer» Correct Answer - 1 |
|
| 80. |
Between two isotherms we have a cycle as shown. Find the work done by the gas during the cycle in (J). [Take: `T_(1) = 127^(@)C, T_(2) = 16^(@)C, n = 1` mole] |
|
Answer» Correct Answer - 75 |
|
| 81. |
A liquid which is confined inside an adiabatic piston is suddenly taken from state 1 to state 2 by a single stage process. If the piston comes to rest at point 2 as shown. Then, the enthalpy change for the process will be: A. `DeltaH = (2gamma P_(0)V_(0))/(gamma -1)`B. `DeltaH = (3gamma P_(0)V_(0))/(gamma-1)`C. `DeltaH =- P_(0)V_(0)`D. none of these |
|
Answer» Correct Answer - C |
|
| 82. |
q.w, `DeltaE` and `DeltaH` for the following process ABCD on a monoatomic gas are: A. `{:(w =- 2P_(0)V_(0)ln2,q = 2P_(0)V_(0)ln2),(DeltaE =0,DeltaH = 0):}`B. `{:(w =- 2P_(0)V_(0)ln2,q = 2P_(0)V_(0)ln),(DeltaE =0,DeltaH =2P_(0)V_(0)ln2):}`C. `{:(w =- P_(0)V_(0)(1+ln2),q = P_(0)V_(0)(1+ln2)),(DeltaE = 0,DeltaH = 0):}`D. `{:(w =- P_(0)V_(0)ln2,q = P_(0)V_(0)ln2),(DeltaE = 0,DeltaH = 0):}` |
|
Answer» Correct Answer - A |
|
| 83. |
What names apply to chemical species corresponding to locations 1 and 2 on this reaction coordiante diagram ? A. `{:("Location 1","Location 2"),("activated complex","activated complex"):}`B. `{:("Location 1","Location 2"),("reaction intermediate","activated complex"):}`C. `{:("Location 1","Location 2"),("activated complex","reaction intermediate"):}`D. `{:("Location 1","Location 2"),("reaction intermediate","reaction intermediate"):}` |
|
Answer» Correct Answer - B |
|
| 84. |
Water ice exists in several different form depending on the pressure and temperature. A proton of the phase diagram for ice I, ice III and liquid water is shown below. Which statement about the densities of these three phases is correct ? A. The density of liquid water is greater than the densities of either ice I or ice III.B. The density of ice I is greater than the densities of either ice III or liquid water.C. The density of ice III is greater than the densities of either ice I or liquid waterD. The densities of ice I and ice III are equal and greater than the density of liquid water. |
|
Answer» Correct Answer - C |
|
| 85. |
Which points in this phase diagram represent conditions of temperature and pressure where liquid will be present ? A. a,b and g onlyB. a,c,d and g onlyC. a,c,d and f onlyD. c,d,e and g only |
|
Answer» Correct Answer - C |
|
| 86. |
A thermodynamic process is shown in the following figure. In the process AB, 600 J of heat is added to the system and in BC, 200 J of heat is added to the system. The change in internal energy of the system in the process AC would be: `P_(A) = 3 xx 10^(4) Pa, V_(A) = 2xx 10^(-3) m^(3)` `P_(B) = 8 xx 10^(4) Pa, V_(C) = 5 xx 10^(-3) m^(3)` A. `560 J`B. `800 J`C. `600 J`D. `640 J` |
|
Answer» Correct Answer - A |
|
| 87. |
From the energy profiles for the two untimolecular reactions below, how will the rates of the two reactions compare if the temperature of each reaction is increased from `25^(@)C` to `75^(@)C`? A. The rate of reaction `A rarr B` will increase more than the rate of reaction `C rarr D`.B. The rate of reaction `C rarr D` will increase more than the rate of reaction `A rarr B`C. The rates of the reactions will increase by the same amount.D. The rate of reaction `A rarr B` will increase but the rate of reaction `C rarr D` will decrease. |
|
Answer» Correct Answer - C |
|
| 88. |
Graph depicting correct behaviour of ideal gas and `H_(2)` gas will be (neglect a):A. B. C. D. |
|
Answer» Correct Answer - A |
|
| 89. |
According to the phase diagram, what would be the effect of increasing the pressure on this substance ? A. Decrease in both the melting and boiling pointsB. Increase in both the melting and boiling pointsC. Increase in the melting point and decrease in the boiling pointD. Decrease in the melting point and increase in the boiling point |
|
Answer» Correct Answer - B |
|
| 90. |
If for a reaction in which `A(g)` converts to `B(g)` the reaction carried out at const. `V` & `T` results into the following grapg. A. Then the reaction must be `A(g) rarr 3B(g)` and is first order reactionB. Then the reaction must be `A(g) rarr 3B(g)` and is second order reactionC. Then the reaction must be `A(g) rarr 3(g)` and is a zero order reactionD. Then the reaction must be `A(g) harr 3B(g)` and is a first order reaction |
|
Answer» Correct Answer - C |
|
| 91. |
For adsorption of gas over solid surface following data is obtained at 300 K. `{:("Pressure of gas (mm of Hg)",100,25),("Amount adsorbed per Kg of charcoal",3gm,1.5gm):}` The slope of the graph between log P us log `x//m` will be: [`x//m` and P are in same units as given in question.] |
|
Answer» Correct Answer - 2 |
|
| 92. |
For adsorption of a gas on solid surface, following isotherm was obtained. Where P is pressure of gas in atm, x represents amount of gas adsorbed and m represents mass of adsorbent, calculate the value of `(x)/(m)` of the gas at same temperature and at a pressure of 81 atm. |
|
Answer» Correct Answer - 90 |
|
| 93. |
Consider the following partially labelled figure (graph is upto scale) for an ideal binary solution of benzene and toluence and answer the following questions. Which graph corresponds to benzene ?A. 1B. 2C. 3D. Any of 1 or 2 |
|
Answer» Correct Answer - B |
|
| 94. |
Following graph shows a single stage expansion, then work done by the system is: A. `-9104 J`B. `-202.6 J`C. `-506 J`D. `-101.3J` |
|
Answer» Correct Answer - B |
|
| 95. |
A given mass of gas expends from the state A to the state B by three paths 1,2 and 3 as shown in the figure. If `w_(1),w_(2)` and `w_(3)` respectively be the magnitude of worl done by the gas along three paths then : A. `w_(1) gt w_(2) gt w_(3)`B. `w_(1) lt w_(2) lt w_(3)`C. `w_(1) = w_(2) = w_(3)`D. `w_(2) lt w_(3) lt w_(1)` |
|
Answer» Correct Answer - B |
|
| 96. |
Electrode potential for Mg electrode varies according to the graph.A. B. C. D. |
|
Answer» Correct Answer - B |
|
| 97. |
In a Cu-voltameter, mass deposited in 30s is m gm. If the time-current graph is shown in the following figure. What is the electrochemical equivalent of Cu? A. `(m)/(2)`B. `(m)/(3)`C. `(m)/(4)`D. `(m)/(63.5)` |
|
Answer» Correct Answer - B |
|
| 98. |
The figures given below depict different processes for a given amount of an ideal gas. |
|
Answer» Correct Answer - a-q,r,t; b-s; c-q,r; d-p,s,t |
|
| 99. |
One mole of an ideal gas going from state-A to state-B through different processes. Column-I shows graph of the process and column-II shows change in parameter in these process. Match the following: |
|
Answer» Correct Answer - a-p,r,s,t; b-p,t; c-p, r,s,t; d-p |
|
| 100. |
A,B and C react in the 1:1:1 stoichiometric ratio. The concentration of A,B and C where found to vary with time as shown in the figure below: The value of equilibrium repreasented in above sketch will be :A. `(12)/(7)`B. `(2)/(3)`C. 2D. `(2)/(9)` |
|
Answer» Correct Answer - B |
|