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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. |
Given : `E^(@) (Cu^(2+//Cu)` = 0.337V` and `E^(@) (Sn^(2+//Sn) = -0.136V`. Which of the following statements is correct?A. `Cu^(2+)` ions can be reduced by `H_(2)(g)`B. Cu can be oxidized by `H^(+)`C. `Sn^(2+)` ions can be reduced by `H^(2)(g)`D. Cu can reduce `Sn^(+)` |
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Answer» Correct Answer - A |
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| 52. |
A fully charged lead-storage battery contains 1.5L of 5M `H_(2)SO_(4)`. During discharging of lead-storage acid battery, following reaction takes place: `Pb(s)+PbO_(2)(s)+2H_(2)SO_(4)rarr2PbSO_(4)(s)+2H_(2)O` |
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Answer» Correct Answer - C |
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| 53. |
We have taken a saturated solution of `AgBr,K_(sp)` of AgBr is `12xx10^(-14)`. If `10^(-7)` "mole" of `AgNO_(3)` are added to 1 litre of this solution then the conductivity of this solution in terms of `10^(-7) Sm^(-1)` units will be: [Given: `lambda_((Ag^(+)))^(@)=4xx10^(-3)Sm^(2)"mol"^(-1),lambda_((Br^(-)))^(@)=6xx10^(-3) S m^(2) "mol"^(-1),lambda_((NO_(3)^(-)))^(@)=5xx10^(-3)Sm^(2) "mol"^(-1)`]A. 39B. 55C. 15D. 41 |
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Answer» Correct Answer - A |
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| 54. |
Calcualte the EMF of the cell at 298K `Pt|H_(2)(1atm) | NaOH(xM),` `NaCl(xM) | AgCl(s) | Ag` `E_(Cl^(-)|AgCl|Ag)^(@)` = +0.222VA. 1.048VB. `-0.04V`C. `-0.604`D. EMF depends on x and cannotbe determined unless value of x is given |
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Answer» Correct Answer - A |
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| 55. |
The oxidation ptentials of `Zn, Cu, Ag, H_2` and Ni are `0.76, - 34, - 0.80 . 0. 00, 0. 25` volt, respectively. Which of the following reactions will provide maximum voltage ?A. `Zn + Cu^(2) rightarrow Cu + Zn^(2+)`B. `Zn + 2Ag^(+) rightarrow 2Ag + Zn^(2+)`C. `H_(2) + Ci^(2+) rightarrow 2H^(+) + Cu`D. `H^(2) + Ni^(2+) rightarrow 2H^(+) + Ni` |
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Answer» Correct Answer - B |
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| 56. |
Consider the following Galvanic cell:- By what value the cell voltage when concentration of ions in anodic and cathodic compartments both increased by factor of 10 at 298K:A. `+0.591`B. `-0.0591`C. `-0.1182`D. 0 |
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Answer» Correct Answer - C |
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| 57. |
By how much will the potential of half-cell `Cu^(2+)|Cu` change if the solution is diluted to 100 times at 298K?A. Increase by 59 mVB. Decrease by 59 mVC. Increase by 29.5mVD. Decrease by 29.5 mV |
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Answer» Correct Answer - B |
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| 58. |
The emf of the cell, `Zn|Zn^(2+)(0.01M)|| Fe^(2+)(0.001M) | Fe` at 298 K is 0.2905 then the value of equilibrium constant for the cell reaction is:A. `e^(0.32/0.0295)`B. `1-^(0.32/0.0295)`C. `10^(0.26/0.0295)`D. `10^(0.32/0.0591)` |
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Answer» Correct Answer - B |
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| 59. |
`Pt |{:((H_(2))),(1atm):}:| pH = 2:|:|:pH =3 |:{:((H_(2))Pt),(1atm):}:|`. The cell reaction for the given cell is:-A. SpontaneousB. non-spontaneousC. equilibriumD. none of these |
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Answer» Correct Answer - B |
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| 60. |
The `Ni//Ni^(2+)` and `F^(-)//F_(2)` electrodes potentials are listed as `+0.25V` and `-2.87V` respectively (with respect to the standard hydrogen electode). The cell potential when these are coupled under standard conditions is:A. 2.62 V and dependent on the reference electrode chosen.B. 3.12 V and independent on the reference electrode chosen.C. 3.12 V and dependent on the reference electrode chosen.D. 2.62 V and independent on the reference electrode chosen. |
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Answer» Correct Answer - B |
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| 61. |
Cosoder the reactopm: `(T = 298 K)` `Cl_2 (g) + 2 BR^(-) (aq) rarr 2 Cl^(-) (aq) + Br_2 (aq.)` The emf of he cell, when `[Cl^(-) = (Br_2] = [Br^(-) ] = 0.01M and Cl_2 ` gas is at `1` atm pressure, will be : (`E^@` for the above reaction is `= 29` volt ).A. 0.54voltB. 0.35voltC. 0.24voltD. `-0.29volt` |
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Answer» Correct Answer - B |
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| 62. |
In the electrolysis of an aqueous potassium sulphate solution, the `PH` of the solution in the space near an electrode increased. Which pole of the current source is the electrode connected to ?A. The positive poleB. Could be either poleC. The negative poleD. Cannot be determined |
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Answer» Correct Answer - C |
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| 63. |
An increase in pH will promote which of the reactions below? (P) 2MnO_(4)^(-) + MnO_(2) + 4OH^(-) rightarrow 3MnO_(4)^(2-) + 2H_(2)O` (Q) `6Cl_(2) + 2I^(-) + 6H_(2)O rightarrow 12Cl^(-) + 2IO_(3)^(-) + 1H^(+)`A. P onlyB. Q onlyC. Both P and QD. Neither P nor Q |
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Answer» Correct Answer - C |
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| 64. |
Find EMF of cell `Pt |H_(2) | H^(+)(pH = 5) || H^(+) (pH =7) | H_(2)| Pt.` Given that `(2.303 RT)/(F) = 0.06`A. 6 voltB. `-0.06` voltC. `-0.12` voltD. 0 volt |
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Answer» Correct Answer - C |
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| 65. |
Cu metal displaces `Ag^(+)(aq)` from its aqueous solution. Which of the following is correct?A. `Cu^(2+)` is better oxidising agent than `Ag^(+)`B. Ag is a better reducing agent than CuC. Ag is easier to oxidise than CuD. `Ag^(+)` is easier to reduce than `Cu^(2+)`. |
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Answer» Correct Answer - D |
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| 66. |
Use the standard reduction potentials to find the standard cell potential `E^(@)`, for the reaction: `Zn(s)+2Tl^(+)(aq)rarrZn^(2+)(aq)+2Tl(s)`A. 0.427VB. 0.091VC. `-0.091V`D. `-0.427V` |
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Answer» Correct Answer - A |
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| 67. |
Which of the half reactions, when coupled, will make a galvanic cell that will produce the largest voltage under standard conditons? P. `Cu^(2+)(aq) + 2e^(-) rightarrow Cu(s)` `E^(@) = +0.34V` Q. `Pb^(2+)(aq) + 2e^(-) rightarrow Pb(s)` `E^(@) = -0.13V` R. `Ag^(+)(aq) + 3e^(-) rightarrow Al(s)` `E^(@) = -1.66V`A. P and QB. P and SC. Q and SD. R and S |
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Answer» Correct Answer - D |
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| 68. |
Nickel metal is added to a solution containign 1.0 m `Pb^(2+)(aq)` and `1.0 M `Cd^(2+)(aq)`. Use the standard reduction potentials to determine which reaction(s) will occur. Reaction 1: `Ni(s) + Pb^(2+)(aq) rightarrow Pb(s) + Ni^(2+)(aq)` Reaction 2: `Ni(s) + Cd^(2+)(aq) rightarrow Cd(s) + Ni^(2+)(aq)` `{:("Reaction", E^(@)), (Pb^(2+)(aq) + e^(-) rightarrow Pb(s) , -0.13V), (Ni^(2+)(aq) + 2e^(-) rightarrow Ni(s), -0.23V), (Cd^(2+)(aq) + 2e^(-) rightarrow Cd(s), -0.40V):}`A. 1 onlyB. 2 onlyC. Both 1 and 2D. Neither 1 nor 2 |
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Answer» Correct Answer - A |
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| 69. |
Use the information in the table and calcualate `E^(@)` for this reaction. `Ga(s) + 3Tl^(+)(aq) rightarrow 3Tl(s) + Ga^(3+) (aq)` `{: ("Reaction", E^(@)), (Ga^(3+)(aq) + 3e^(-) rightarrow Ga(s), -0.529V), (Tl^(+)(aq) + e^(-) rightarrow Tl(s), -0.336V):}`A. 0.479VB. 0.193VC. `-0.193V`D. `0.479V` |
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Answer» Correct Answer - B |
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| 70. |
A resistance of `50Omega` is registered when two electrodes are suspended into a beaker containing a dilute solution of a strong electrolyte such that exactly half of them are submerged into solution as shown in figure. If the solution is diluted by adding pure water (negligible conductivity) so as to just completely submerge the electrodes, the new ressitance offered by the solution would be: ltbegt A. `50 Omega`B. `100 Omega`C. `25Omega`D. `200Omega` |
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Answer» Correct Answer - A |
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| 71. |
Calculate emf of given cell at `25^(@)C`: [Given: `E_(Ag^(+)//Ag)^(@)) = 0.80V]`A. `+0.80V`B. 0.12 VC. `-0.178 V`D. 1.04 V |
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Answer» Correct Answer - A |
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| 72. |
How many liters of chlorine gas, `Cl_(2)`, measured at `0^(@)C` and 1 atm are released by the passage of 6.25 amperes for 1.85 hours through molten magnesium chloride?A. 0.0805LB. 0.161LC. 4.83LD. 9.67L |
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Answer» Correct Answer - C |
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| 73. |
The standard reduction potential for `H^(+)(aq)` is 0.00v. What is the reduction potential for a `1 xx 10^(-3)` M HCl solution?A. 0.355 VB. 0.178 VC. `-0.178` VD. `0.355`V |
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Answer» Correct Answer - C |
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| 74. |
Under what conditions is the Nernst equation used to calcualte cell potential voltages in a voltaic cell?A. Non standard concentration onlyB. non-spontaneous reactions onlyC. Reactions at equilibrium onlyD. Reactions of ions with the same charges only |
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Answer» Correct Answer - A |
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| 75. |
In a `H_(2) rightarrow O_(2)` fuel cell, 6.81 L of hydrogen at STP reacts in 15 minutes, the average current produced in amperes is:A. 64.3 ampB. 643.3 ampC. 6.43 ampD. 0.643 amp |
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Answer» Correct Answer - A |
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| 76. |
`DeltaG = DeltaH - TDeltaS` and `DeltaG + T[(d(DeltaG))/(dT)]_(p)` then `((dE_(cell)/(dT))` is:A. `(DeltaS)/(nF)`B. `(nF)/(DeltaS)`C. `-nFE_(cell)`D. `+nEF_(cell)` |
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Answer» Correct Answer - A |
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| 77. |
Statement-1: The SRP of three metallic ions `A^(+),B^(2+),C^(3+)` are `-0.3,-0.5,0.8` volt respectively, so oxidising power of ions is `C^(3+)gtA^(+)gtB^(2+)` Statement-2: Higher the SRP. Higher the oxidising power.A. Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-27B. Statement-1 is True, Statement-2 is True : Statement-2 is `NOT` a correct explanation for Statement-27C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - A |
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| 78. |
`DeltaG` is the available energy (energy produced) during the electochemical reaction in galvanic cell which can be converted into useful work. In the light of second law of thermodynamics, in the cell, the change in electrode potential with temperature will be equal to:A. `DeltaS)/(nF)`B. `(nF)/(DeltaS)`C. `-2.303` RT log `K_(c)`D. `(-2.303 RT)/(nF)` |
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Answer» Correct Answer - A |
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| 79. |
Statement-1: We can add the electrode potential in order to get electrode potential of net reaction. Statement-2: Electrode potential is an intensiveA. Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-28B. Statement-1 is True, Statement-2 is True : Statement-2 is `NOT` a correct explanation for Statement-28C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - D |
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| 80. |
Which of the following statements is wrong about galvanic cells?A. Cathode is the positive electrode.B. Cathode is the negative electrode.C. Electrons flow from cathode to anode in the external circuit.D. Reduction occurs at cathode. |
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Answer» Correct Answer - B::C |
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| 81. |
While charging the lead storage battery:A. `PbSO_(4)` anode is reduced to Pb.B. `PbSO_(4)` cathode is reduced to Pb.C. `PbSO_(4)` anode is oxidised to PbD. `PbSO_(4)` anode is oxidised to `PbO_(2)` |
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Answer» Correct Answer - A |
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| 82. |
Which products are formed by the electrolysis of an aqueous solution of `AlCl_(3)`? (P) Al(s) (Q) `Cl_(2)(g)` (R) `H_(2)(g)` (S) `O_(2)(g)`A. P and R onlyB. P and S onlyC. Q and R onlyD. Q and S only |
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Answer» Correct Answer - C |
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| 83. |
Given `E_(Ag^(+)//Ag)^(@)=0.80V`, `E_(Mg^(2+)//Mg)^(@)=-2.37V`, `E_(Cu^(2+)//Cu)^(@)=0.79 E_(Hg^(2+)//Hg)^(@)=1.71V` Which of the following statements is/are correct?A. `AgNO_(3)` can be stored in copper vesselB. `Mg(NO_(3))_(2)` can be stored in copper vesselC. `CuCl_(2)` can be stored in silver vesselD. `HgCl_(2)` can be stored in copper vessel |
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Answer» Correct Answer - B::C |
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| 84. |
Statement-1: Electric work output is maximum when the electrochemical cell is in a equilibrium state. Statement-1: Maximum work can be obtained when the process is raversible and reaches equilibrium.A. Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-15B. Statement-1 is True, Statement-2 is True : Statement-2 is `NOT` a correct explanation for Statement-15C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - D |
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| 85. |
A variable, opposite external potential`(E_(ext)` is applied to the cell :`Zn|Zn^(2+)(1M)||Cu^(2+) (1M)|Cu, ` of potential 1.1 V.respectively electrons flow from :A. anode to cathode in both casesB. anode to cathode and cathode to anodeC. cathode to anode in both casesD. cathode to anode and anode to cathode. |
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Answer» Correct Answer - B |
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| 86. |
In a concentration cell, `Zn|Zn^(2+) (0.1M) || Zn^(2+) (0.15M) | Zn`, as the cell discharges:A. reaction proceeds to the rightB. the two solutions approach each other in concentration.C. no reaction takes placeD. water gets decomposed. |
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Answer» Correct Answer - B |
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| 87. |
Statement-1: Equivalent conductance increases when 1 mL (1M) solution of sodium acetate is injeced into a water bulb having 90 mL of `H_(2)O`. Statement-2: Degree of ionization increases with dilution.A. Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-1B. Statement-1 is True, Statement-2 is True : Statement-2 is `NOT` a correct explanation for Statement-1C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - B |
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| 88. |
Calcualte `DeltaG^(@)` for `Mn^(+2) + MnO_(2) overset(H^(+))to 2Mn^(+3) + H_(2)O` Given: `E_(Mn^(+3)//Mn^(+2))^(@) = 1.51V`, V, `E_(MnO_(2)//Mn^(+3))^(@)` = 0.95 V.A. 237.39 kJB. 54 kJC. `-54kJ`D. `-237.39kJ` |
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Answer» Correct Answer - B |
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| 89. |
For which half-reaction will a 0.1 unit increase in pH cause the greatest increases in half-cell potential?A. `V^(2+)(aq) rightarrow V^(3+)(aq) + 2^(-)`B. `VO_(3) + 2H^(+) rightarrow VO_(2)^(-) + H_(2)O`C. `VO^(2+) + 2H^(+) + e^(-) rightarrow V_(3+) + H_(2)O`D. `VO^(2+) + H_(2)O rightarrow VO_(2)^(+) + 2H^(+) + e^(-)` |
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Answer» Correct Answer - B |
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| 90. |
In a half-cell containing `[Tl^(3+)] = 0.1M` and `[Tl^(+)] = 0.01`M, the cell potential is `-1.2496 V` for the reaction `Tl^(+) rightarrow Tl^(3+) + 2e^(-)`. The standard reduction potential of the `Tl^(+3)|Tl^(+1)` couple at `25^(@)`C is:A. 144 VB. 0.61 VC. 2.44 VD. 1.22 V |
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Answer» Correct Answer - D |
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| 91. |
For a galvanic cell involving the half-reaction at standard conditions, `Au^(3+) + 3e(-) rightarrow Au` `E^(@) = 1.50V` `Tl^(+) + e(-) rightarrow Tl` `E^(@) = -0.34V`A. 0.48VB. 1.16VC. 1.84VD. 2.52V |
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Answer» Correct Answer - C |
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| 92. |
When the sample of copper with zinc impurityn is to be purified by electrolysis, the appropriate electrode are .A. pure zinc as cathode and pure copper as anodeB. impure sample as cathode and pure copper as anodeC. impure zinc as cathode and impure sample as anodeD. pure copper as cathode and impure sample as anode. |
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Answer» Correct Answer - D |
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| 93. |
100L aqueous solution of KBr is electrlysed by using current of 9.65 ampere for 10 seconds, using Pt electrode. Which of the following species will not be produced due to electrolysis?A. `H_(2)`B. `O_(2)`C. `Br_(2)`D. `KOH` |
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Answer» Correct Answer - B |
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| 94. |
100L aqueous solution of KBr is electrlysed by using current of 9.65 ampere for 10 seconds, using Pt electrode. pH of the the resulting solution in cell will be:A. 3B. 5C. 11D. 9 |
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Answer» Correct Answer - D |
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| 95. |
The standard electrode potential for the reactions, `Ag^(+)(aq)+e^(-) rarr Ag(s)` `Sn^(2+)(aq)+2e^(-) rarr Sn(s)` at `25^(@)C` are `0.80 ` volt and `-0.14 ` volt, respectively. The `emf`of the cell `Sn|Sn^(2+)(1M)||Ag^(+)(1M)Ag` is `:`A. 0.66 voltB. 0.80 voltC. 1.80 voltD. 0.94 volt |
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Answer» Correct Answer - D |
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| 96. |
The EMF of an electrolytic cell does not depend upon:A. valency of reacting material used in cellB. concentration of metal ion present in the electrolyte soutionC. quantity of electrolytic solution used in the cellD. temperature of elecrolytic cell |
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Answer» Correct Answer - C |
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| 97. |
For the reaction: `C_(3)H_(8)(g) + 5O_(2)(g) rightarrow 3CO_(2)(g) + 4H_(2)O(l)`, `DeltaG^(@) = -2.108 xx 10^(3) kJmol^(-)` What is the value of of the standard electrode potential, `E^(@)` for a fuel cell based on this reaction?A. 1.09 VB. 2.18 VC. 4.37 VD. 21.8 V |
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Answer» Correct Answer - A |
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| 98. |
Accidentally chewing on a stray fragmet of aluminium foil can causes a sharp tooth path if the aluminium comes in contact with an amalgam filing. The filing, an alloy of silver, tin and mercury, acts as the cathode of a tiny galvanic cell, the aluminium behaves as the anode, and salivas serves as the electrolyte. when the aluminium and the filling come in contact, and electric current passage from the aluminium to the filling which is sensed by a nerve in the tooth. Aluminium is oxidized at the anode, and `O_(2)` gas is reduced to water at the cathode. `E_(AI^(3+)//AI)^(@) =- 1.66 E_(O_(2)H^(+)//H_(2)O)6^(@) = 1.23 V` Standard `E.M.F` experienced by the person with dental filing is:A. 0.43VB. 2.89VC. 3.98VD. None of these |
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Answer» Correct Answer - B |
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| 99. |
For the cell `Tl|Tl^(+)(0.001M)||Cu^(2+)(0.01M)|Cu.E_("cell")` at `25^(@)C` is 0.83V, which can be increased:A. by increasing `[Cu^(2+)]`B. by increasing `[Tl^(+)]`C. by decreasing `[Cu^(2+)]`D. by decreasing `[Tl^(+)]` |
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Answer» Correct Answer - A::D |
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| 100. |
`Pt(Cl_(2))(p_(1))|HCl(0.1M)|(Cl_(2))(p_(2)),Pt` cell reaction will be endergonic ifA. `P_(1) = P_(2)`B. `P_(1) gt P_(2)`C. `P_(2) gt P_(1)`D. `P_(1) = P_(2) = 1 atm` |
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Answer» Correct Answer - C |
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