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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.
| 151. |
Wlhich of the following cell can produce more electrical work?A. `Pt,H_(2) | NH_(4)Cl||0.1M CH_(3)COOH|H_(2),Pt`B. `Pt,H_(2)|0.1M HCl||0.1M NaOH|H_(2), Pt`C. `Pt,H_(2)|0.1 M CH_(3)COOK|H_(2),Pt`D. `Pt,H_92)|0.1 M CH_(3)COOK||0.1M HCl|H_(2),Pt` |
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Answer» Correct Answer - D |
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| 152. |
The standard potential for the reaction, `Cl_(2)(g) + 2Br^(-)(aq) rightarrow Br_(2)(l) + 2Cl^(-)(aq)` is 0.283 volts. What is the equilibrium consant for this reaction at `25^(@)`C?A. `1.6 xx 10^(-5)`B. 22C. `6.1 xx 10^(4)`D. `3.9 xx 10^(9)` |
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Answer» Correct Answer - D |
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| 153. |
A sample of water from a large swimming pool has a resistance of `10000Omega` at `25^(@)C` when placed in a certain conductace cell. When filled with `0.02M KCI` solution, the cell has a resistance of `100 Omega` at `25^(@)C, 585 gm` of `NaCI` were dissolved in the pool, which was throughly stirred. A sample of this solution gave a resistance of `8000 Omega`. Given: Molar conductance of `NaCI` at that concentration is `125 Omega^(-1) cm^(2) mol^(-1)` and molar conductivity of `KCI` at `0.02 M` is `200W^(-1) cm^(2) mol^(-1)`. Volume (in Litres) of water in the pool is:A. `1.25xx10^(5)`B. 1250C. 12500D. none of these |
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Answer» Correct Answer - A |
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| 154. |
Tollen reagent is used for the detection of aldehydes. When a solution of `AgNO_(3)` is added to glucose with `NH_(4)OH`, then gluconic acid is formed. `Ag^(o+)+e^(-) rarr Ag," "E^(c-)._(red)=0.8V` `C_(6)H_(12)O_(6)rarr underset(Gluconic aci d)(C_(6)H_(12)O_(7)+)2H^(o+)+2e^(-) , " "E^(c-)._(o x i d ) =-0.05V` `[Ag(NH_(3))_(2)]^(o+)+e^(-) rarr Ag(s)+2NH_(3), " "E^(c-)._(red)=0.337V` `[Use2.303xx(RT)/(F)=0.0592` and `(F)/(RT)=38.92at 298 K ]` When ammonia is added to the solution, `pH` is raised to `11`. Which half cell reaction is affected by `pH` and by how much ?A. `E_("oxd")` will increase by a factor of 0.65 for `E_("oxd")^(@)`B. `E_("oxd")` will decrease by a factor of 0.65 for `E_("oxd")^(@)`C. `E_("red")` will increase by a factor of 0.65 for `E_("red")^(@)`D. `E_("red")` will decrease by a factor of 0.65 for `E_("red")^(@)` |
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Answer» Correct Answer - A |
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| 155. |
Tollen reagent is used for the detection of aldehydes. When a solution of `AgNO_(3)` is added to glucose with `NH_(4)OH`, then gluconic acid is formed. `Ag^(o+)+e^(-) rarr Ag," "E^(c-)._(red)=0.8V` `C_(6)H_(12)O_(6)rarr underset(Gluconic aci d)(C_(6)H_(12)O_(7)+)2H^(o+)+2e^(-) , " "E^(c-)._(o x i d ) =-0.05V` `[Ag(NH_(3))_(2)]^(o+)+e^(-) rarr Ag(s)+2NH_(3), " "E^(c-)._(red)=0.337V` `[Use2.303xx(RT)/(F)=0.0592` and `(F)/(RT)=38.92at 298 K ]` Ammonia is always added in this reaction. Which of the followijng must be wrong ?A. 66.13B. 58.38C. 28.3D. 46.29 |
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Answer» Correct Answer - B |
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| 156. |
Tollen reagent is used for the detection of aldehydes. When a solution of `AgNO_(3)` is added to glucose with `NH_(4)OH`, then gluconic acid is formed. `Ag^(o+)+e^(-) rarr Ag," "E^(c-)._(red)=0.8V` `C_(6)H_(12)O_(6)rarr underset(Gluconic aci d)(C_(6)H_(12)O_(7)+)2H^(o+)+2e^(-) , " "E^(c-)._(o x i d ) =-0.05V` `[Ag(NH_(3))_(2)]^(o+)+e^(-) rarr Ag(s)+2NH_(3), " "E^(c-)._(red)=0.337V` `[Use2.303xx(RT)/(F)=0.0592` and `(F)/(RT)=38.92at 298 K ]` Ammonia is always added in this reaction. Which of the followijng must be wrong ?A. `NH_(3)` combines with `Ag^(+)` to form a complex.B. `Ag(NH_(3))_(2)^(+)` is a weaker oxidising reagent than `Ag^(+)`C. In absence of `NH_(3)`. Silver salt of gluconic acid is formed.D. `NH_(3)` has affected the standard reduction of glucose/gluconic acid electrode. |
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Answer» Correct Answer - D |
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| 157. |
A sample of water from a large swimming pool has a resistance of `10000Omega` at `25^(@)C` when placed in a certain conductace cell. When filled with `0.02M KCI` solution, the cell has a resistance of `100 Omega` at `25^(@)C, 585 gm` of `NaCI` were dissolved in the pool, which was throughly stirred. A sample of this solution gave a resistance of `8000 Omega`. Given: Molar conductance of `NaCI` at that concentration is `125 Omega^(-1) cm^(2) mol^(-1)` and molar conductivity of `KCI` at `0.02 M` is `200W^(-1) cm^(2) mol^(-1)`. Cell constant (in `cm^(-1))` of conductane cell is:A. 4B. 0.4C. `4xx10^(-2)`D. `4xx10^(-5)` |
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Answer» Correct Answer - B |
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| 158. |
A sample of water from a large swimming pool has a resistance of `10000Omega` at `25^(@)C` when placed in a certain conductace cell. When filled with `0.02M KCI` solution, the cell has a resistance of `100 Omega` at `25^(@)C, 585 gm` of `NaCI` were dissolved in the pool, which was throughly stirred. A sample of this solution gave a resistance of `8000 Omega`. Given: Molar conductance of `NaCI` at that concentration is `125 Omega^(-1) cm^(2) mol^(-1)` and molar conductivity of `KCI` at `0.02 M` is `200W^(-1) cm^(2) mol^(-1)`. Cell constant (in `cm^(-1))` of conductane cell is:A. `4xx10^(-2)`B. `4xx10^(-3)`C. `4xx10^(-5)`D. none of these |
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Answer» Correct Answer - C |
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| 159. |
A standard hydrogen electrode has zero electrode potential because :A. hydrogen is easier to oxidise.B.C. this electrode potential is assumed to be zeroD. hydrogen atom is only one electron |
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Answer» Correct Answer - B |
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| 160. |
Which of the following metals could be used successfully to galvanize iron? [Given: `E_(Ni^(+2)//Ni)^(@) = -0.23V` ``E_(Cu^(+2)//Cu)^(@) = -0.34V` `E_(Sn^(+2)//Sn)^(@) = -0.14V` `E_(Mn^(+2)//Mn)^(@) = -1.18V` `E_(Fe^(+2)//Fe)^(@) = -0.41V`A. NiB. CuC. SnD. Mn |
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Answer» Correct Answer - D |
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| 161. |
Which cell will measure standard electrode potential of copper electrode?A. `Pt(s) || H_(2) (g, 0.1 "bar") || H^(+)(aq., 1M) || Cu^(2+) (aq., 1M) || Cu`B. `Pt(s) || H_(2) (g, 1 "bar") || H^(+)(aq., 1M) || Cu^(2+) (aq., 2M) || Cu`C. `Pt(s) || H_(2) (g, 1 "bar") || H^(+)(aq., 1M) || Cu^(2+) (aq., 1M) || Cu`D. `Pt(s) || H_(2) (g, 0.1 "bar") || H^(+)(aq., 1M) || Cu^(2+) (aq., 1M) || Cu` |
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Answer» Correct Answer - C |
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| 162. |
Potential for some half cell reactions are given below. On the basis of these mark the correct answer. (i) `H^(+)(aq) + e^(-) rightarrow (1/2)H^(2)(g)` `E_(cell)^(@) = 0.00V` (ii) `2H_(2)O(l) rightarrow O_(2)(g) + 4H^(+)(aq) + 4e^(-)`, `E_(cell) = 1.96V` (iii) `2SO_(4)^(2-)(aq) rightarrow S_(2)O_(8)^(2-)(aq) + 2e^(-), E_(cell)^(@) = 1.96V`A. In dilute sulphuric acid solution, hydrogen will be reduced at cathode.B. In concentrated sulphuric acid solution, water will be oxidised at anode.C. In dilute sulphuric acid solution, water will be oxidised at anode.D. In dilute sulphuric acid solution, `SO_(4)^(2-)` ion will be oxidised to tetrathionate ion at anode. |
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Answer» Correct Answer - C |
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| 163. |
Copper reduced `NO_(3)^(-)` into NO and `NO_(2)` depending upon cone. Of `HNO_(3)` in solution. Assuming `[Cu^(2+)]=0.1M` and `P_(NO)=P_(NO_(2)=10^(-3)` atm and using given data answer the following question: `E_(Cu^(2+)|Cu)^(@)=+0.34` volt `E_(NO_(3)^(-)|NO)^(@)=+0.96` volt `E_(NO_(#)^(-)|NO_(3))^(@)=+0.79` volt at 298K `(RT)/(F)(2.303)=0.06` volt `E_("cell")` for reduction of `NO_(3)^(-)rarrNO` by Cu(s), when `[HNO_(3)]=1M` is: [At T=298]A. `~0.61`B. `~0.71`C. `~0.51`D. `~0.81` |
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Answer» Correct Answer - B |
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| 164. |
An unknown mtal, M, and its salt, `M(NO_(3)_(2)`are combined with a half-cell in which the following reaction occurs: `2Ag^(+) + M rightarrow 2Ag + M^(2+)` `Ag^(+)(aq) + e(-) rightarrow Ag(s)` `[E_(red)^(@) = 0.80V] If `E_(cell)^(@)` = 1.36V, what is `E_(red)^(@)` for `M^(2+)(aq) + 2e^(-) rightarrow M(s)`?A. 0.56VB. 0.24VC. `-0.24V`D. `-0.56V` |
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Answer» Correct Answer - D |
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| 165. |
Which two substances react spontaneously?A. Ag and CuB. `Ag^(+) and Cu`C. `Ag and Cu^(2+)`D. `Ag^(+) and Cu^(2+)` |
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Answer» Correct Answer - B |
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| 166. |
Any redox reaction would occur spontaneously, if:-A. the free energy change `(DeltaG)` is negativeB. the `DeltaG^(@)` is positiveC. the cell at be e.m.f. `(E^(@))` is negativeD. the cell e.m.f. is positive |
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Answer» Correct Answer - A::D |
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| 167. |
Electrolysis of dilute aqueous `NaCl` solution was carried out by passing `10mA` current. The time required to liberate `0.01mol` of `H_(2)` gas at the cathode is `(1F=96500C mol ^(-1))`A. `9.65xx10^(4)`secB. `19.3xx10^(4)` secC. `28xx10^(4)` secD. `38.6xx10^(4)` sec |
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Answer» Correct Answer - B |
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| 168. |
Which is a consistent set of values for a specific redox reaction carried out under standard conditions? |
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Answer» Correct Answer - A |
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| 169. |
Equivalent weight of `H_(2)SO_(4)` in the following reaction `(Pb(s) + PbO_(2)(s) + H_(2)SO_(4) rightarrow PbSO_(4) + H_(2)O` isA. 98B. 49C. 196D. 80 |
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Answer» Correct Answer - A |
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| 170. |
The overall reaction for the lead storage batter when it discharges is: `Pb(s) + PbO_(2)(s) + 4H^(+)(aq) + 2SO_94)^(2-)(aq) rightarrow 2PbSO_(4)(s) + 2H_(2)O(l)` (P) PbSO_(4) is formed only at the cathode. (Q) The density of the solution decreases. Which statements correctly describes the battery as its discharges?A. P onlyB. Q onlyC. both P and QD. neither P not Q |
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Answer» Correct Answer - B |
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| 171. |
When a cleaned strip of zinc metal is placed in a solution of `CuSO_(4)`, a spontaneous reaction occurs, which of the following observation(s) is/are made?A. The mass of zinc metal decreases graduallyB. The copper metal starts depositing on either zinc plate or settles donw in the vesselC. The solution remains electrically neutralD. The temperature of the solution decreases as it is an endothermic reaction. |
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Answer» Correct Answer - A::B::C |
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| 172. |
Four colourless salt solutions are placed in separation test tubes and a strip of copper is dipped in each. Which solution finally turns blue? (use data from electrochemical seriesA. `Pb(NO_(3)_(2)`B. `AgNO_(3)`C. `Zn(NO_(3)_(2)`D. `Cd(NO_(3)_(2)` |
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Answer» Correct Answer - B |
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| 173. |
Copper reduced `NO_(3)^(-)` into NO and `NO_(2)` depending upon cone. Of `HNO_(3)` in solution. Assuming `[Cu^(2+)]=0.1M` and `P_(NO)=P_(NO_(2)=10^(-3)` atm and using given data answer the following question: `E_(Cu^(2+)|Cu)^(@)=+0.34` volt `E_(NO_(3)^(-)|NO)^(@)=+0.96` volt `E_(NO_(#)^(-)|NO_(3))^(@)=+0.79` volt at 298K `(RT)/(F)(2.303)=0.06` volt At what `HNO_(3)` concentration thermodynamic tendency for reduction of `NO_(3)^(-)` into NO and `NO_(3)` by copper is same?A. `10^(1//23)M`B. `10^(0.56)M`C. `10^(0.625)M`D. `10^(0.12)M` |
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Answer» Correct Answer - C |
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| 174. |
The reduction potential of hydrogen half cell will be negative if :A. `p(H_(2)) = 1 atm and [H^(+)] = 2.0 M`B. `p(H_(2))` = 1 atm and `[H^(+)]` = 1.0 MC. `p(H_(2)` = 2 atm and [H^(+)] = 1.0 MD. `p(H_(2)` = 2atm and` [H^(+)]`= 2.0M |
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Answer» Correct Answer - C |
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| 175. |
`|underset("("p_(1)")")(H_(2))|underset("("p_(1)")")(H^(+))|underset("("1M")")(H^(+))|underset("("p_(2)")")(H_(2))|` Pt (where `p_(1) and `p_(2)`are pressures) cell reactioin will be spontaneous if:A. `p_(1) = p_(2)`B. `p_(1) lt p_(2)`C. `p_(2) gt p_(1)`D. `p_(1) = 1atm` |
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Answer» Correct Answer - B |
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| 176. |
`Zn | Zn^(2+)(C_(1) || Zn^(2+)(C_(2)| Zn`. For this cell `DeltaG` is negative if:A. `C_(1) = C_(2)`B. `C_(1) gt C_(2)`C. `C_(2) gt C_(1)`D. none of these |
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Answer» Correct Answer - C |
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| 177. |
The standard emf for the cell cell reaction ` Zn + Cu^(2+) rarr Zn^(2+) + Cu ` is 1.10 volt at ` 25^@ C`. The emf for the cell reaction when ` 0.1 M Cu^(2+)` and ` 0.1 M ZN^(2+)` solutions are used at `25^@ =C` is .A. `1.10`VoltB. 0.110 voltC. `-1.10volt`D. `-0.110volt` |
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Answer» Correct Answer - A |
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| 178. |
The questions consist of two atatements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses : Ig ` ((dE_(cell))/(dT))_pgt 0` for a cell reaction then `Delta S` is positive . `Delta S= nFT ((dE)/(dT))_p`.A. Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-4B. Statement-1 is True, Statement-2 is True : Statement-2 is `NOT` a correct explanation for Statement-4C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - C |
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| 179. |
A steady current of 1.20 ampere is passed through a solution of `MCl_(x)` for 2 hours and 33 minutes. If 2.98 g of metal M is plated out, what is the identity of the metal?A. AlB. CrC. NiD. Zn |
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Answer» Correct Answer - B |
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| 180. |
A current of 0.5 ampere when passed through `AgNO_(3)` solution for 193 sec. deposited 0.108 g of Ag. Find the equivalent weight of Ag. |
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Answer» Correct Answer - 108 |
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| 181. |
When a current of 0.25 ampere is passed through excess of molten `MCl_(x)` for half an hour, 0.45gm of metal M (atomic mass=193) is deposited at the cathode. The value ofg x is:A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B |
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| 182. |
In an electrolytic cell the electrode at which the electrons enter the solution and the chemical change that occurs at this electrode are called respectively as:A. anode, oxidationB. anode,reductionC. cathode, oxidationD. cathode, reduction |
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Answer» Correct Answer - D |
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| 183. |
A current of 2.0A is used to plate Ni(s) from 500mL of a 1.0M `Ni^(2+)`(aq) solution. What is the `[Ni^(2+)]` after 3.0 hours?A. 0.39mB. 0.46mC. 0.78mD. 0.89m |
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Answer» Correct Answer - C |
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| 184. |
A solution containing equimolar amounts of `NiCl_(2)` and `SnBr_(2)` is electrolyzed using a 9V battery and graphite electrodes. What are the first products formed. A. Ni(s) at cathode, `Cl_(2)(aq)` at anodeB. Ni(s) cathode, `Br_(2)(aq)` at anodeC. Sn(s) at cathode, `Br_(2)(aq)` at anodeD. Sn(s) at cathode, `Cl_(2)(aq)` at anode |
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Answer» Correct Answer - C |
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| 185. |
When an aqueous solution of potassium fluoride is electrolyzed, which of the following occursA. `O_(2)` and `H^(+)` are produced at one electrode and `H_(2)` and `OH^(-)` are formed at the other.B. `O_(2)` and `OH^(-)` are produced at one electrode and `H_(2)` and `H^(+)` are formed at the other.C. Metallic K is formed at one electrode and `O_(2)` and `H^(+)` are formed at the other.D. Metallic K is produced at one electrode and elemental `F_(2)` is produced at the other. |
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Answer» Correct Answer - A |
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| 186. |
In a battery with a zinc anode, what is the 250mA is drawn for 12.0 minutes?A. 0.0610gB. 0.122gC. 0.244gD. 1.02g |
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Answer» Correct Answer - A |
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| 187. |
`Ag^(+)(aq) + e^(-) rightarrow Ag(s)` `E^(@) = 0.80V` `Co^(2+)(aq) + 2e(-) rightarrow Co(s)` `E^(@) = -0.28V` Use the standard reduction potentials to determine the standard potential for the reaction: `Co(s) + 2Ag^(+)(aq_) rightarrow Co^(2+)(aq) + 2Ag(s)`A. 0.52VB. 0.66VC. 1.08VD. 1.88V |
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Answer» Correct Answer - C |
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| 188. |
Given the standard reduction potentials. `{:(O_(2)+4H^(+)+4e^(-)rarr2H_(2)O,E^(@)=1.23V),(Br_(2)+2e^(-)rarr2Br^(-),E^(@)=1.08V),(2H^(+)+2e^(-)rarrH_(2),E^(@)=0.00V),(Na^(+)+e^(-)rarrNa,E^(@)=-2.71V):}` What products are formed in the electrolyss of 1M NaBr in a solution with `[H_(3)O^(+)]=1M`?A. Na(s) and `O_(2)(g)`B. Na(s) and `Br_(2)(g)`C. `H_(2)(g)` and `Br_(2)(g)`D. `H_(2)(g)` and `O_(2)(g)` |
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Answer» Correct Answer - C |
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| 189. |
`H_(2)O_(2)` can be produced by the ammonium hydrogen sulphate. Reactions occuring in electrolytic cell, `NH_(4)HSO_(4)rarrNH_(4)^(-)+2e^(-)` (Anode) `2SO_(4)^(2-)rarrS_(2)O_(8)^(2-)+2e^(-)` `2H^(+)+2e^(-)rarrH_(2)` (Cathode) Hydrolysis of ammonium persulphate: `(NH_(4))_(2)S_(2)O_(8)+2H_(2)Orarr2NH_(4)HSO_(4)+H_(2)O_(2)` Assume 100% yield of hydrolysis reaction. How many "mole"s of electrons are to be passed in order to produce enough `H_(2)O_(2)` which when reacted with excess of KI then liberated iodine required 100 mL of centimolar hypo solution.A. `10^(-1)`B. `10^(-2)`C. `10^(-3)`D. `5xx10^(-4)` |
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Answer» Correct Answer - C |
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| 190. |
`H_(2)O_(2)` can be produced by the ammonium hydrogen sulphate. Reactions occuring in electrolytic cell, `NH_(4)HSO_(4)rarrNH_(4)^(-)+2e^(-)` (Anode) `2SO_(4)^(2-)rarrS_(2)O_(8)^(2-)+2e^(-)` `2H^(+)+2e^(-)rarrH_(2)` (Cathode) Hydrolysis of ammonium persulphate: `(NH_(4))_(2)S_(2)O_(8)+2H_(2)Orarr2NH_(4)HSO_(4)+H_(2)O_(2)` Assume 100% yield of hydrolysis reaction. What volume of hydrogen gas at 1 atm and 273 K will be produced in cathode in previous question?A. 22.4LB. 11.2LC. 5.6LD. 2.8L |
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Answer» Correct Answer - B |
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| 191. |
`H_(2)O_(2)` can be produced by the ammonium hydrogen sulphate. Reactions occuring in electrolytic cell, `NH_(4)HSO_(4)rarrNH_(4)^(-)+2e^(-)` (Anode) `2SO_(4)^(2-)rarrS_(2)O_(8)^(2-)+2e^(-)` `2H^(+)+2e^(-)rarrH_(2)` (Cathode) Hydrolysis of ammonium persulphate: `(NH_(4))_(2)S_(2)O_(8)+2H_(2)Orarr2NH_(4)HSO_(4)+H_(2)O_(2)` Assume 100% yield of hydrolysis reaction. What is the current efficiency when 100 Amp current is passed for 965 seconds in order to produce 17 gm of `H_(2)O_(2)`.A. 0.2B. 0.4C. 0.8D. 1 |
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Answer» Correct Answer - D |
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| 192. |
If same quantity of electricity is passed through three electrolytic cells containing `FeSO_(4),Fe_(2)(SO_(4))_(3)`, and `Fe(NO_(3))_(3)`, thenA. the amount of iron deposited in `FeSO_(4)` and `Fe_(2)(SO_(4))_(2)` are equal.B. the amount of iron deposited in `FeSO_(4)` is 1.5 times of the amount of iron deposited in `Fe(NO_(3))_(3)`.C. the amount of iron deposited in `Fe_(2)(SO_(4))_(3)` and `Fe(NO_(3))_(3)` are equal.D. the same amount of gas is evolved in all threee cases at the anode. |
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Answer» Correct Answer - B::C::D |
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| 193. |
Conductivity of an electrolytic solution depends on:A. nature of electrolyteB. concentration of electrlyteC. power of AC sourceD. distance between the electrodes |
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Answer» Correct Answer - D::B |
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| 194. |
Ionic conductances of `H^(+)` and `SO_(4)^(2-)` at infinite dilution are x and y S `cm^(2) "equiv"^(-1)`. Hence, equivalent conductance of `H_(2)SO_(4)` at infinite dilution is:A. x+yB. `2(x+y)`C. `2x+y`D. `x+2y` |
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Answer» Correct Answer - A |
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| 195. |
Which has the maximum conductivity ?A. `[Cr(NH_(3))_(3)Cl_(3)]`B. `[Cr(NH_(3))_(4)Cl_(2)]Cl`C. `[Cr(NH_(3))_(5)Cl]Cl_(2)`D. `[Cr(NH_(3))_(6)Cl_(3)` |
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Answer» Correct Answer - D |
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| 196. |
For a saturated solution of AgCl at `25^(@)C,k=3.4xx10^(-6) ohm^(-1)cm^(-1)` and that of `H_(2)O` (l) used is `2.02xx10^(-6) ohm^(-1) cm^(-1),lambda_(m)^(@)` for AgCl is 138 `ohm^(-1) cm^(2) "mol"^(-1)` then the solubility of AgCl in "mole"s per litre will be:A. `10^(-5)`B. `10^(-10)`C. `10^(-14)`D. `10^(-16)` |
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Answer» Correct Answer - A |
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| 197. |
The conductivity of saturated solution of `BaSO_(4)` is `3.06xx10^(-6) ohm^(-1) cm^(-1)` and its equivalent conductance is 1.53 `ohm^(-1) cm^(2) "equiv"^(-1)`. The `K_(sp)` for `BaSO_(4)` will be:A. `4xx10^(-12)`B. `2.5xx10^(-13)`C. `25xx10^(-9)`D. `10^(-6)` |
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Answer» Correct Answer - D |
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| 198. |
Molar conductance of `BaCl_(2),H_(2)SO_(4)` and HCl at infinite dilutions are `x_(1),x_(2)` and `x_(3)`, respectively. Equivalent conductance of `BaSO_(4)` at infinite dilution will be:-A. `([x_(1)+x_(2)-x_(3)])/(2)`B. `([x_(1)-x_(2)-x_(3)])/(3)`C. `2(x_(1)+x_(2)-2x_(3))`D. `([x_(1)+x_(2)-2x_(3)])/(2)` |
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Answer» Correct Answer - D |
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| 199. |
`MnO_(4)^(-) + 8H^(+) + 5e^(-) rightarrow Mn^(2+) + 4H-(2)O`, If `H^(+)` concentration is decreased from 1 M to `10^(-4)` M at `25^(@)C`, whereas concentration of `Mn^(2+)` and `MnO_(4)^(-)` remains 1M, then:A. The potential decreases by 0.38V with decrease in oxidising power.B. The potential increases by 0.38 V with increase in oxidising powerC. the potential decreases by 0.25 V with decrease in oxidising powerD. the potential decreases by 0.38 V without affecting oxidising power. |
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Answer» Correct Answer - A |
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| 200. |
The concentration of potassium ions inside a biological cell is at least 20 times higher than outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simplel model for a concentration cell involving a metal `M` is `M(s)|M^(o+)(aq,0.05 ` molar`)||M^(o+)(aq,1` molar`)|M(s)` For the abov electrolytic cell, the magnitude of the cell potential is `|E_(cell)|=70mV.` If the `0.05` moolar solution of `M^(o+)` is replaced by a `0.0025` molar `M^(o+)` solution, then the magnitude of the cell potential would beA. 35mVB. 70mVC. 140mVD. 700mV |
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Answer» Correct Answer - C |
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