Normal aluminimum electrode cupled with normal hydrogen electrode gives an emf of ` 1.66 V`. So the standard electrode potential of aluminimu is ,A. ` -1. 66 V`B. ` + 1.66 V`C. ` - 0. 83 V`D. ` + 0. 83 V`

Normal aluminimum electrode cupled with normal hydrogen electrode give

1.	Normal aluminimum electrode cupled with normal hydrogen electrode gives an emf of ` 1.66 V`. So the standard electrode potential of aluminimu is ,A. ` -1. 66 V`B. ` + 1.66 V`C. ` - 0. 83 V`D. ` + 0. 83 V`
Answer» Correct Answer - A Al is above hydrogen in the electrochemical secies, therefore `Al^(3+)` has lesser reuction tendecy as compared with `H^(+)`. Hence, hydrogen electrode acts as anode when copled with aluminum electrode. ` E_("cell")^@=E_(H+//H_2)^@ -D_(Al^(3+)//Al)^@` ` :. 1.66V=0.0V- E_(Al^(3+)//Al)^@` ` E_(Al^(3+)//Al) =- 1.66 V`.

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Normal aluminimum electrode cupled with normal hydrogen electrode gives an emf of ` 1.66 V`. So the standard electrode potential of aluminimu is ,A. ` -1. 66 V`B. ` + 1.66 V`C. ` - 0. 83 V`D. ` + 0. 83 V`

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