AP EAMCET202315 May 2023Morning ShiftChemistryd and f Block ElementsActual
Given below are two statements Assertion (A): All Cu (II) halides are known except the iodide Reason (R): Cu ²⁺ oxidizes I ⁻ to I ₂ The correct answer is
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of ( A )
- BBoth (A) and (R) are correct and (R) is the correct but ( R ) is not the correct explanation of ( A )
- C(A) is correct but (R) is not correct
- D(A) is not correct but ( R ) is correct
Correct answer
A. Both (A) and (R) are correct and (R) is the correct explanation of ( A )
Step-by-step solution
aligned & E _ Cu ²⁺ / Cu ^ =+0.34 ~V , E _ I ₂ / I ⁻ ^ =0.54 & 2 Cu ²⁺+4 I ⁻ 2 CuI + I ₂ aligned Despite the above values of the standard reduction potentials, Cu ²⁺ is able to oxidize iodide to I ₂ due to all the species like Cu ²⁺, Cu ⁺ , and CuI being present together in the solution. The cumulative effect of this results in the Cu ²⁺ CuI reduction potential being +0.88 ~V that makes the reaction feasible. Therefore, CuI or Cu ₂ I ₂ exists instead of CuI ₂ as Cu ²⁺ oxidises I ⁻ to I ₂ and so (A) and (R) are true