Q. 33.9( 22 Votes )

Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions

Class 12th NCERT - Chemistry Part-I 3. Electrochemistry

Answer :

For a substance to oxidise Fe²⁺to Fe³⁺ ion, it must have high reduction potential than Fe³⁺. The reduction potential of Fe³⁺ to Fe²⁺ reaction is 0.77V, the substances which have reduction potentials higher than this value will oxidise Fe²⁺ ions. Comparing the values, from the table:

F₂,Br₂,Cl₂,H₂O₂ can oxidise ferrous ions.

Rate this question :

How useful is this solution?

We strive to provide quality solutions. Please rate us to serve you better.

PREVIOUSCan you store copper sulphate solutions in a zinc pot?NEXTCalculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

RELATED QUESTIONS :

(a) The cell in which the following reaction occurs :

2Fe³⁺(aq) + 2I^–(aq) → 2Fe²⁺(aq) + I₂(s)

has E°_cell = 0.236 V at 298 K. Calculate the standard Gibbs energy of the cell reaction. (Given : 1 F = 96,500 C mol^–1)

(b) How many electrons flow through a metallic wire if a current of 0.5 A is passed for 2 hours? (Given : 1 F = 96,500 C mol^–1)

Chemistry - Board Papers

A. Calculate of the following reaction at 298K:

Given:

B. Using the values of A and B, predict which is better for coating the surface of iron to prevent corrosion and why?

Given:

Chemistry - Board Papers

A. The conductivity of solution of is calculate its molar conductivity and degree of dissociation

Given and

B. Define electrochemical cell. What happens if external potential applied becomes greater than of electrochemical cell?

Chemistry - Board Papers

What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell? When will the maximum work be obtained from a galvanic cell?

Chemistry - Exemplar

What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell? When will the maximum work be obtained from a galvanic cell?

Chemistry - Exemplar

Assertion : Ag⁺/Ag increases with increase in concentration of Ag+ ions.

Reason : Ag⁺/Ag has a positive value.

Chemistry - Exemplar

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Ag⁺/Ag increases with increase in concentration of Ag+ ions.

Reason : Ag⁺/Ag has a positive value.

Chemistry - Exemplar