EASY
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During electrolysis, the reaction at the anode is:

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Important Questions on Redox Reactions

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If electrolysis of aqueous CuSO4 solution is carried out using Cu-electrodes, the reaction taking place at the anode is
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The hydrogen electrode is dipped in a solution of pH=3 at 25°C, the potential of the cell would be (the value of 2.303RTF=0.059V)
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During the electrolysis of aqueous sodium chloride, the product obtained at anode is
HARD

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

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  • Name the cation that remains as a spectator ion in the solution.
MEDIUM
The amount of Ag (atomic mass = 108) deposited at the cathode when a current of 0.5 amp is passed through a solution of AgNO3 for 1 hour is closest to
HARD

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

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  • Which equation for the reaction at the anode is correct?
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Aqueous solution of which of the following compounds is the best conductor of electric current?
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Among the following, which is the strongest oxidizing agent?
MEDIUM
What is the standard potential of cell NiNi2+1MCu2+1M|Cu If EoCu+2|Cu=0·337 V and EoNi+2|Ni=-0·236 V
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The electrode potential, E°, for the reduction of MnO4- to Mn2+ in acidic medium is +1.51
V. Which of the following metal(s) will be oxidised? The reduction reactions and standard electrode potentials for Zn2+,Ag+ and Au+Au+ are given as

Zn2+(aq)+2eZn(s),E°=-0.762 V

Ag+(aq)+eAg(s),E°=+0.80 V

Au+(aq)+eAu(s),E°+1.69 V

HARD

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

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  • What do you observe at the cathode and anode respectively?
EASY
The order of reactivity of K, Mg, Au and Zn with water is
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The electrode potential of M2+/M of 3 d-series elements shows positive value for?
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When electricity is passed through a solution of AlCl2, 13.5 g of Al is deposited at the cathode. The number of faradays passed is
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Hypophosphorus acid is a good reducing agent because
MEDIUM
When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is:
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A constant current (0.5 amp) is passed for 1 hour through (i) aqueous AgNO3 . (ii) aqueous CuSO4 and (iii) molten AlF3 , separately. The ratio of the mass of the metals deposited on the cathode is [MAg, MCu, MAl are molar masses of the respective metals]
MEDIUM
An iron wire is immersed in a solution containing ZnSO4 and NiSO4. When the concentration of each salt is 1M, predict which of the following reaction is likely to proceed.
Given EoZn+2/Zn=-0.76 V
EoFe+2/Fe=-0.44 V
and Eo(Ni+2/Ni)=-0.25 V
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Which of the following transformations can be carried out by using HI as a reducing agent, under acidic conditions?

[Given : I2s2I- Eo=0.54 V ]

(i) Cu+Cus  Eo=0.52 V

(ii) Cr3+Cr2+  Eo=-0.41 V

(iii) Fe3+Fe2+  Eo =0.77 V

(iv) Fe2+Fes  Eo=-0.44 V
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Which of the following metals will precipitate copper from copper sulphate solution?