question_answer

Aluminium displaces hydrogen from acids but copper does not. A galvanic cell prepared by combining \[Cu/C{{u}^{2+}}\]and \[Al/A{{l}^{3+}}\]has an e.m.f. of 2.0 V at 298 K. If the potential of copper electrode is  + 0.34 V, that of aluminium is                  [CPMT 2001; KCET 2001]

A)                 + 1.66 V               

B)                 ? 1.66 V

C)                 + 2.34 V               

D)                 ? 2.3 V