Chemistry Class 11 NCERT Solutions: Chapter 8 Redox Reactions Part 8

Chemistry Class 11 NCERT Solutions Chapter 8 Redox Reactions Part 8

Q: 13. Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions:

(A) Equation

(B) Equation

(C) Equation

(D) Equation

(E) Equation

Answer:

(A) Oxidised substance → Equation

Reduced substance → Equation

Oxidising agent → Equation

Reducing agent → Equation

Q 13 A Structure of Silver Bromide

Q 13 a Structure of Silver Bromide

Q 13 A Structure of Silver Bromide

(B) Oxidised substance → Equation

Reduced substance → Equation

Oxidising agent → Equation

Reducing agent → HCHO

(C) Oxidised substance → Equation

Reduced substance → Equation

Oxidising agent → Equation

Reducing agent → Equation

(D) Oxidised substance → Equation

Reduced substance → Equation

Oxidising agent → Equation

Reducing agent → Equation

(E) Oxidised substance → Equation

Reduced substance → Equation

Oxidising agent → Equation

Reducing agent → Equation

Q: 14. Consider the reactions:

Equation

Equation

Why does the same reductant, thiosulphate react differently with iodine and bromine?

Answer

The average oxidation number (O.N.) of S in Equation is +2. Being a stronger oxidising agent than Equation oxidised Equation , in which the O.N. of S is +6. However, Equation is a weak oxidising agent. Therefore, it oxidised Equation in which the average O.N of S is only +2.5. As a result, Equation reacts differently with iodine and bromine.

Q: 15. Justify giving reactions that among halogens, fluorine is the best oxidant and among

a Hydrohalic compound, hydroiodic acid is the best reductant.

Answer

Equation as:

Equation

Equation

Equation

On the other hand, Equation , and Equation cannot oxidize Equation . The oxidizing power of halogens increases in the order of Equation . Hence, fluorine is the best oxidant among halogens.

HI and Equation can reduce Equation , but HCl and HF cannot. Therefore, HI and HBr are

stronger reductants than HCl and HF.

Equation

Equation

Again, I– can reduce Equation cannot.

Equation

Hence, hydroiodic acid is the best reductant among hydrohalic compounds.

Thus, the reducing power of hydrohalic acids increases in the order of Equation

Q: 16. Why does the following reaction occur?

Equation

What conclusion about the compound Equation (of which Equation is a part) can be drawn

from the reaction.

Answer:

The given reaction occurs because Equation oxidises Equation reduces Equation

Equation

In this reaction, the oxidation number (O.N.) of Equation decreases from +8 in Equation to +6 in

Equation and the O.N. of F increases from –1 in F– to O in Equation .

Hence, we can conclude that Equation is a stronger oxidising agent than Equation

Q: 17. Consider the reactions:

(A) Equation

Equation Equation

(C) Equation

(D) Equation → No change observed.

What inference do you draw about the behaviour of Equation and Equation from these reactions?

Answer:

Equation and Equation act as oxidising agents in reactions

(A) And

(B) Respectively. In reaction

(C) Equation oxidises Equation to Equation but in reaction

(D) Equation cannot oxidise C6H5CHO.

Hence, we can say that Equation is a stronger oxidising agent than Equation .

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