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The standard reduction potentials for Zn ²⁺ / Zn , Ni ²⁺ / Ni , and Fe ²⁺ / Fe are -0.76,-0.23 and -0.44 ~V respectively. The reaction X + Y ²⁺ X ²⁺+ Y will be spontaneous when:

Options

  1. AX=N i, Y=F e
  2. BX=N i, Y=Z n
  3. CX=F e, Y=Z n
  4. DX=Z n, Y=N i

Correct answer

D. X=Z n, Y=N i

Step-by-step solution

aligned & Zn + Fe ⁺² Zn ⁺²+ Fe & Fe + Ni ⁺² Fe ²⁺+ Ni & Zn + Ni ²⁺ Zn ⁺²+ Ni aligned All these are spontaneous

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