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Question

Given below are two statements:

Statement (I) : Oxidizing power of halogens decreases in the order $F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}$, which is the basis of "Layer test".

Statement (II): "Layer test" to identify ${Br}_{2}$ and $I_{2}$ in aqueous solution involves the oxidation of bromide or iodide into ${Br}_{2}$ or $I_{2}$ respectively with ${Cl}_{2}$, which is a type of displacement redox reaction.

In the light of the above statements, choose the correct answer from the options given below:

Options

A.Both Statement I and Statement II are true
B.Both Statement I and Statement II are false
C.Statement I is true but Statement II is false
D.Statement I is false but Statement II is true

Solution

Sol. [Key Concept: Oxidising power $F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}$; the layer test is a displacement redox.]

(I) $F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}$ (Oxidizing power order)

(II) $NaBr + {Cl}_{2}$-water $\rightarrow {Br}_{2} + NaCl$

$$NaI + {Cl}_{2}\text{-water}\text{~} \rightarrow I_{2} + NaCl$$

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