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Consider the following standard electrode potentials ( E o in volts) in aqueous solution: E l e m e n t M 3 + / M M + / M A l - 1.66 + 0.55 T l + 1.26 - 0.34 Based on these data, which of the following statements is correct?

Options

  1. AT l + is more stable than A l 3 +
  2. BA l + is more stable than A l 3 +
  3. CT l 3 + is more stable than A l 3 +
  4. DT l + is more stable than A l +

Correct answer

D. T l + is more stable than A l +

Step-by-step solution

∆ G o = - n F E o if E o =   p o s i t i v e ;   then ∆ G o = n e g a t i v e , For those, conversions whose E o values are more positive are more favourable. As we can see from then electrode potential data, that reduction of Al + is spontaneous, but reduction of Tl + is not. So, we can conclude from this that T l + is more stable than A l +

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