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251.

Use the following standard electrode potentials, calculate `DeltaG^(@)` in kJ`//`mol for the indicated reaction : `5Ce^(4+)(aq)+Mn^(2+)(aq)+4H_(2)O(l)to5Ce^(3+)(aq)+MnO_(4)^(-)(aq)+8H^(+)(aq)` `MnO_(4)^(-)(aq)+8H^(+)(aq)+5e^(-)toMn^(2+)(aq)+4H_(2)O(l), E^(@)=+1.51 V` `Ce^(4+)(aq)+e^(=)toCe^(3+)(aq)" "E^(@)=+1.61 V`A. `-9.65`B. `-24.3`C. `-48.25`D. `-35.2`

Answer» Correct Answer - C
`E_(cell)^(@)=E_(RP(RHS))^(@)-E_(RP(LHS))^(@)`
`=1.61-1.51rArr0.10V`
`DeltaG^(@)=-nFE^(@)rArr-5xx96500xx0.10J`
`DeltaG^(@)=-48.25kJ`
Discussion
252.

For which of the following SOP and SRP are equalA. SHEB. Mg electrodeC. Ni electrodeD. Copper electrode

Answer» Correct Answer - A
For hydrogen SOP=SRP=O
Discussion
253.

One ampere of current is passed for 9650 seconds through molten `AlCl_(3)` What is the weight in grams of `Al` deposited at cathode? (Atomic weight of `Al=27)`A. `0.9`B. `9.0`C. `0.09`D. `90.0`

Answer» Correct Answer - A
Discussion
254.

With increase in temperature the electrical conduction of metallic conductorA. increasesB. decreasesC. remains the sameD. changes irregularly

Answer» Correct Answer - B
Discussion
255.

On passing a current through molten `KCl 19.5` g of K is deposited. The amount of `Al` deposited by the same quantity of electricity if passed through molten `AlCl_(3)` isA. `4.5` gB. `9.0` gC. `13.5` gD. 27 g

Answer» Correct Answer - A
Discussion
256.

In an electrolytic cell, the flow of electrons is formA. anode to cathode in the solutionB. cathode to anode through external circuitC. anode to cathode through external external circuitD. all to these

Answer» Correct Answer - C
Discussion
257.

How long will a current of 1 ampere take for complete deposition of copper from 1 litre of `1NCuSO_(4).5H_(2)O` solution ?A. 96500 secB. 2`xx`96500secC. `[(96500)/(2)]sec`D. `[(96500)/(4)]`sec

Answer» Correct Answer - A
Q=Ct
Discussion
258.

`6.24xx10^(19)` electrons are equal approximately toA. 10 coulombsB. 96500 coulombsC. one electron voltD. `0.1`F

Answer» Correct Answer - A
`6.023xx10^(23)e^(-)s=96,500` coulombs
Discussion
259.

In an electrolytic cell current flowsA. Cathode to anode in outer circuitB. Anode to cathode outside the cellC. Cathode to anode inside the cellD. Current does not flow

Answer» Correct Answer - A
In electrolylic cell current flows from cathode to another because flow of current is just opposite to flow of electrons.
`2H^(+)+2E^(-)rarrH_(2)uarr`(cathode)
Discussion
260.

Aluminium oxide may be electrolysed at `1000^(@)`C to furnish aluminium metal (Atomic mass = 27 amu, 1 Faraday = 96500 Coulomb). The cathode reaction is `Al^(3+) + 3e^(-) rightarrow Al`. To prepare 5.12 kg of aluminium metal by this method would require:A. `5.49xx10^(1)C` of electricityB. `5xx49xx10^(4)" Co of electricity"`C. `1.83 xx10^(7) "C of electricity"`D. `5.49xx10^(7) "C of electricity"`

Answer» Correct Answer - D
`9g-96500c" " 5.12xx10^(3)g-?`
Discussion
261.

The electrice charge for eeletrode deposition of `1g` equivalent of a substance isA. 96,500 coulombsB. One ampere per secC. One ampere for one hourD. Charge in faradays

Answer» Correct Answer - A
1 Faraday deposits 1 gm eqivalent of a substance.
Discussion
262.

The standard electrode potentials, `E_(I_(2)//I^(-))^(@), E_(Br^(-)//Br_(2))^(@)`and `E_(Fe//Fe^(2+))^(@)` are respectively `+ 0.54 V, -1.09 V` and `0.44 V` as the basis of given data which of following is/are spontaneousA. `Br_(2)+2I^(-) rarr 2Br^(-)+I_(2)`B. `Fe+Br_(2)rarr Fe^(2+)+2Br^(-)`C. `Fe+I_(2)rarr Fe^(2+)+2I^(-)`D. `I_(2)2Br^(-)rarr 2I^(-)Br_(2)`

Answer» Correct Answer - A
Discussion
263.

If mercury is used as cathode in the electrolysis of NaCl solution, the ions discharged at cathode areA. `H^(+)`B. `Na^(+)`C. `OH^(-)`D. `Cl^(-)`

Answer» Correct Answer - B
Discussion
264.

Statement : `Pt_(H_(2))|HCl ` at `25^(@)C E_(H) = 0`. Explanation : For primary reference electrode `E_(H//H^(+))^(@) = 0`A. S is correct but E is wrongB. S is wrong but E is correntC. Both S and E are correct and E is corrent explanation of S.D. Both S and E are correct but E is not correct explanation of S

Answer» Correct Answer - B
Primary reference electrode is
`underset("1 atm")(Pt_(H_(2)))//underset(1M)(HCl)" " at 25^(@)"C its",E^(@)=0`
Discussion
265.

Statement : The cathode of electrolytic cell during electrolysis of `NaCl_((aq.))` on additon of little litmus shows a blue colour. Explanation : At cathode : `2H^(+) + 2e rarr H_(2)`. The reaction at cathode give rise to an increase in `pH` ranging in alkaline medium and litmus shows blue colour.A. S is correct but E is wrongB. S is wrong but E is correntC. Both S and E are correct and E is corrent explanation of S.D. Both S and E are correct but E is not correct explanation of S

Answer» Correct Answer - C
Explanation is correct reason for statement
Discussion
266.

Assertion `(A):` The mobility of `Na^(o+)` is lower than that of `K^(o+)` ion. Reason `(R): ` The ionic mobility depends upon the effective radius of the ion.A. S is correct but E is wrongB. S is wrong but E is correntC. Both S and E are correct and E is corrent explanation of S.D. Both S and E are correct but E is not correct explanation of S

Answer» Correct Answer - C
Explanation is correct reason for statement
Discussion
267.

Statement : `E_(cell)^(@)` is an intensive property Explanation : `DeltaH^(@)//n` is also intensive propertyA. S is correct but E is wrongB. S is wrong but E is correntC. Both S and E are correct and E is corrent explanation of S.D. Both S and E are correct but E is not correct explanation of S

Answer» Correct Answer - C
`-DeltaG^(@)=nE^(@)F`
`thereforeE^(@)=(-DeltaG^(@))/(nF)`
Since `DeltaG` is intensive property then `E^(@)` is also intensive property
Discussion