AP EAMCET201822 Apr 2018Morning ShiftChemistryElectrochemistryActual
When an aqueous solution of CuCl ₂ is electrolysed using Pt inert electrodes, the reaction at cathode and anode respectively are
Options
- A4 H ₂ O (f) +4 a ⁻ 2 H ₂(g)+4 OH ₂( aq ) ; 2 H ₂ O (l) -4 a ⁻ O ₂(g)+4 H ⁺( aq )
- B2 Cu ^ 2 * ( aq ) + se ⁻ 2 Cu ( s ) ; 2 H ₂ O (l) -4 ~s ⁻ O ₂(g)+4 H ^*(a q)
- CCu ^ 2 * ( aq ) +2 a ⁻ , Cu ( s ) ; 2 Cl ⁻( aq ) -2 a ⁻ Cl ₂( ~g )
- D2 H ₂ O (f) +2 a ⁻ H ₂(g)+2 O H ( aq ) ; 2 Cl ⁻(a q) -2 an ⁻ Cl ₂(g)
Correct answer
C. Cu ^ 2 * ( aq ) +2 a ⁻ , Cu ( s ) ; 2 Cl ⁻( aq ) -2 a ⁻ Cl ₂( ~g )
Step-by-step solution
CuCl ₂ Cu ²⁺(a q)+2 Cl ⁻(a q) Cl ⁻ show oxidation at anode and form Cl ₂ gas. 2 Cl ⁻ -2 2 e⁻ Cl ₂(g) Due to less reactivity, Cu ²⁺ gain electrons and deposited at cathode electrode. Cu ²⁺+2 e⁻ Cu