Q31 of 37 Page 109

In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Redox couple is the combination of oxidised and reduced form of a substance involved in an oxidation or reduction half cell.


Reason (R) : In the representation E° Fe3+/fe2+and E°cu2+/cu , Fe3+ / Fe2+ and Cu2+ are redox couples.


(i) Both A and R are true and R is the correct explanation of A.


(ii) Both A and R are true but R is not the correct explanation of A.


(iii) A is true but R is false.


(iv) Both A and R are false


(iii) A is true but R is false.

A redox couple is a reducing species and its corresponding oxidizing form written in a particular representation.


Fe3+|Fe2+ and Cu2+|Cu are the correct representations of a redox couple, implying that Fe3+ is an oxidized state of Fe and same for Cu.


More from this chapter

All 37 →
29

In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): In the reaction between potassium permanganate and potassium iodide, permanganate ions act as oxidising agent.


Reason (R): Oxidation state of manganese changes from +2 to +7 during the reaction.


(i) Both A and R are true and R is the correct explanation of A.


(ii) Both A and R are true but R is not the correct explanation of A.


(iii) A is true but R is false.


(iv) Both A and R are false.


 30

In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): The decomposition of hydrogen peroxide to form water and oxygen is an example of disproportionation reaction.


Reason (R) : The oxygen of peroxide is in –1 oxidation state and it is converted to zero oxidation state in O2 and –2 oxidation state in H2O.


(i) Both A and R are true and R is the correct explanation of A.


(ii) Both A and R are true but R is not the correct explanation of A.


(iii) A is true but R is false.


(iv) Both A and R are false.


 32

Explain redox reactions on the basis of electron transfer. Give suitable examples.

 33

On the basis of standard electrode potential values, suggest which of the following reactions would take place? (Consult the book for Edegree value).

(i) Cu + Zn2+→ Cu2+ + Zn


(ii) Mg + Fe2+→ Mg2+ + Fe


(iii) Br2 + 2Cl-→ Cl2 + 2Br-


(iv) Fe + Cd2+→ Cd + Fe2+