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All Cu(II) halides are known except the ...

All Cu(II) halides are known except the iodide. The reason for it is that

A

iodide ion is a bulky ion

B

`Cu^(2+)` oxidizes iodide to iodine

C

`Cu^(2+) ` (aq) has much more negative hydration enthalpy

D

`Cu^(2+)` ion has smaller size

Text Solution

Verified by Experts

Iodide `(I^(-))` ions are stronger reducing agent. They reduce `Cu^(2+)` to `Cu^(+) ( 2CuI_(2) rarr Cu_(2)I_(2)+ I_(2))` In other words, `Cu^(2+)`oxidizes `I^(-)` ions to`I_(2)`
`(2Cu^(2+) + 4I^(-) rarrCu_(2)I_(2)(s)+ I_(2))`
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The unique behaviour of CU, having a positive E^(@) (reduction potential) accounts for its inability to liberate H_(2) from acids,. Only oxidising acids (nitric acid and hot concentrated sulphuric acid) react with Cu. The high energy of transform Cu(s) to Cu^(2+)(aq.) is not balanced by its hydration enthalpy. On the other hand, All Cu(II) halides are known except iodide. in this case, Cu^(2+) oxidises I^(-) to I_(2) : 2Cu^(2+)+4I^(-) to 2CuI(s)+I_(2) However, copper (I) compounds are unstable in aqueous solution annd undergo disproportionation. 2Cu^(+)(aq.)toCu^(2+)(aq.)+Cu The stability of Cu^(2+)(aq.) rather than Cu^(+)(aq) is due to the much more negative Delta_(Hyd) of Cu^(2+)(aq.) than Cu^(+)(aq.) Q. Select the correct chemical change:

The unique behaviour of CU, having a positive E^(@) (reduction potential) accounts for its inability to liberate H_(2) from acids,. Only oxidising acids (nitric acid and hot concentrated sulphuric acid) react with Cu. The high energy of transform Cu(s) to Cu^(2+)(aq.) is not balanced by its hydration enthalpy. On the other hand, All Cu(II) halides are known except iodide. in this case, Cu^(2+) oxidises I^(-) to I_(2) : 2Cu^(2+)+4I^(-) to 2CuI(s)+I_(2) However, copper (I) compounds are unstable in aqueous solution annd undergo disproportionation. 2Cu^(+)(aq.)toCu^(2+)(aq.)+Cu The stability of Cu^(2+)(aq.) rather than Cu^(+)(aq) is due to the much more negative Delta_(Hyd) of Cu^(2+)(aq.) than Cu^(+)(aq.) Q. Consider the following transformation: CuSO_(4)(aq.)+KI(excess)to product Select the correct statement:

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