Redox Reaction Test

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Redox Reaction Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

Direction: 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) : Among halogens fluorine is the best oxidant.
Reason (R) : Fluorine is the most electronegative atom.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false,

D
D. Both A and R are false.

Solution

Reason (R): As fluorine has highest electron affinity and bond energy in comparison to other halogens, so the tendency to accept a new electron is highest.
Question 2
1 / -0

Direction: 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) : Among halogens fluorine is the best oxidant.
Reason (R) : Fluorine is the most electronegative atom.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Fluorine (F2) has the maximum E0 value (+2.87 V) among the halogens, hence, it reduces first than other halogens and acts as the best oxidant. Fluorine is the most electronegative atom due to its small size.
Hence, both assertion and reason are correct but reason is not the correct explanation for assertion.
Question 3
1 / -0

Direction: 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.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false,

D
D. Both A and R are false.

Solution

In the reaction given in assertion, the oxidation number changes from +7 to +4.
Question 4
1 / -0

Direction: 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.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

2KMnO4 +2KI⟶2MnO2 +I2 +4KO
Oxidation state of Mn in 2KMnO4 is −2+2x−16=0
x=9
Oxidation state of Mn in 2MnO2 is 2x−8=0
x=4
The decrease of oxidation state indicates that Mn is oxidising agent
Question 5
1 / -0

Direction: 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.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Disproportionation is a redox reaction in which one compound of intermediate oxidation state converts to two compounds, one of higher and one of lower oxidation states.
2H₂O₂(ag)→2H₂O(l)+O₂(g) Here the oxygen of peroxide, which is present in −1 state, is converted to zero oxidation state in O₂ undergoing oxidation and decreases to −2 oxidation state in H₂O undergoing reduction. So, it is an example of disproportionation reaction.
Hence, both assertion and reason are correct and reason is the correct explanation for assertion.
Question 6
1 / -0

Direction: 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.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false

Solution

Disproportionation is a redox reaction in which one compound of intermediate oxidation state converts to two compounds, one of higher and one of lower oxidation states.
2H₂O₂(ag)→2H₂O(l)+O₂(g) Here the oxygen of peroxide, which is present in −1 state, is converted to zero oxidation state in O₂ undergoing oxidation and decreases to −2 oxidation state in H₂O undergoing reduction. So, it is an example of disproportionation reaction.
So, it is an example of disproportionation reaction.Hence, both assertion and reason are correct and reason is the correct explanation for assertion.
Question 7
1 / -0

Direction: 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 and and are redox couples.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false,

D
D. Both A and R are false.

Solution

In the reaction of an electrolytic cell both the reduced and oxidized forms of the same species are present. These are represented in the reduction and oxidation half reactions separately or combined form i.e., redox couple.
Question 8
1 / -0

Direction: 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): Structure I is more accurate than II
Reason (R): More electronegative oxygen atom carries negative charge in I.

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

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

C
C. (A) is true but (R) is false.

D
D. (A) is false but (R) is true.

Solution

Atoms are electrically neutral. They do not have net electrical charge.Number of protons and electrons are equal. Hence, total positive charges are balanced with total negative charges.
Question 9
1 / -0

Direction: 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^OFe³⁺ /Fe²⁺and E^O Cu²⁺/Cu, Fe³⁺/ Fe²⁺ and Cu²⁺ / Cu are redox couples.

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

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

A redox couple is defined as pair of compounds or elements having together the oxidised and reduced forms of it and taking part in an oxidation or reduction half-reaction. So, Fe3+/Fe2+and Cu2+/Cu are redox couples.
Both assertion and reason are true reason is the correct explanation of assertion.
Question 10
1 / -0

Direction: 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 a reaction Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s) Zn is a reductant but itself get oxidized.
Reason (R) : In a redox reaction, oxidant is reduced by accepting electrons and reductant is oxidized by losing electrons.

A
(A) is True, (R) is True; (R) is a correct explanation for (A)

B
(A) is True, (R) is True; (R) is not a correct explanation for (A)

C
(A) is True, (R) is false

D
(A) is false, (R) is true

Solution