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Iodine is liberated in the reaction betw...

Iodine is liberated in the reaction between KI and `CU^(2+)` ions but chlorine is not liberated when KCl is added to `Cu^(2+)` ions. Explain.

Text Solution

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KI dissolves in water to give `I^(-)` ions which are powerful reducing in nature. They reduce `Cu^(2+)` ions to `Cu^(+)` ions and `I_(2)` is thus liberated.
`2Cu^(2+)+2I^(-) to 2Cu^(+)+I_(2)`
But `Cl^(-)` ions released when KCl is dissolved in water are very weak reducing in nature and are not in a position to reduce `Cu^(2+)` ions to `Cu^(+)` ions. Therefore, chlorine is not liberated in this case.
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Explore conceptually related problems

(a) When a moist blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red and then latter gets decolourised. Explain. (b) Iodine is liberated when KI is added to a solution of Cu^(2+) ions but Cl_(2) is not liberated when KCl is added to a solution of Cu^(2+) ions. why?

Assign reasons for the following : (i) When a moist blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red and then latter gets decolourised. Explain. (ii) Iodine is liberated when KI is added to a solution of Cu^(2+) ions but Cl_(2) is not liberated when KCI is added to a solution of Cu^(2+) ions. Why ? (iii) Na_(2)S_(2)O_(3) reacts with Cl_(2) and I_(2) to give different oxidation products. Write the equations of the reactions involved and give a plausible explanation of their contrasting behaviour. (iv) Name a compound of fluorine which shows +1 oxidation state. How is this compound prepared ? Is this a disproportionation reaction ?

Knowledge Check

  • Cu^(2+) ion is

    A
    weakly acidic
    B
    weakiy basic
    C
    strongly basic
    D
    neutral

  • Cu^(2+) ion is

    A
    weakly acidic
    B
    weakly basic
    C
    strongly basic
    D
    neutral

  • Asserartion:Iodine is liberated when KI is added to Cu^(2+) ions but Cl_(2) is not liberated when KCl added to Cu^(2+) ions. Reason: The reducing power of I^(-) is more than Cl^(-) .

    A
    If both assertion and reason are true and reason is the true explanation of the asseraton.
    B
    If both asseration and reason are true but the reason is not the correct explanation of asseration.
    C
    If the asseration is true but reason is false.
    D
    If asseration is false but reason is true.

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