Chemistry Class-11: Chapter –8. Redox Reactions Part-5

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IV. Matching Type

Question: 27

Match Column I with Column II for the oxidation states of the central atoms.

Match Column I with Column II for the Oxidation States of the Central Atoms
Match Column I with Column II for the oxidation states of the central atoms

Column I

Column II

(i)

(a)

(ii)

(b)

(iii)

(c)

(iv)

(d)

(e)

Answer:

Question: 28

Match Column I with Column II for the Oxidation States of the Central Atoms
Match Column I with Column II for the oxidation states of the central atoms

Column I

Column II

(i)

Ions having positive charge

(a)

(ii)

The sum of oxidation number

of all atoms in a neutral molecule

(b)

(iii)

Oxidation number of hydrogen ion

(c)

(iv)

Oxidation number of fluorine in

(d)

(v)

Ions having negative charge

(e)

Cation

(f)

Anion

Answer:

V. Assertion and Reason Type

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.

Question: 29

Assertion (A): Among halogens fluorine is the best oxidant.

Reason (R): Fluorine is the most electronegative atom.

(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.

Answer: (ii)

Question: 30

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 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.

Answer: (iii)

Question: 31

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 oxidation state and it is converted to zero oxidation state in and oxidation state in .

(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.

Answer: (i)

Question: 32

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 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.

Answer: (ii)

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