AP EAMCET202021 Sep 2020Evening ShiftChemistryElectrochemistryActual
Which of the following statements is correct for the cell ( Zn | Zn ⁺² | Cu ⁺² | Cu ) ?
Options
- A( Zn ) is reducing agent.
- BCu is anode.
- C( Cu ) is oxidising agent.
- DThe cell reaction is ( Zn + Cu ⁺² Zn ⁺²+ Cu )
Correct answer
D. The cell reaction is ( Zn + Cu ⁺² Zn ⁺²+ Cu )
Step-by-step solution
In the Daniell cell, copper and zinc electrodes are immersed in a solution of copper(II) sulphate and zinc sulphate, respectively. At the anode (negative electrode), zinc is oxidised per the following half reaction. ( Zn (s) Zn ²⁺(a q)+2 e⁻ ) At the cathode (positive electrode), copper is reduced per the following reaction. ( Cu ²⁺(a q)+2 e⁻ Cu (s) ) Overall cell reaction is ( Zn (s)+ Cu ²⁺(a q) Zn ²⁺(a q)+ Cu (s) ) These processes result in the accumulation of solid copper at the cathode and the corrosion of the z