Multiple choice

Standard electrode potential values for Al3+/Al is –1.66 V and that of Tl3+/Tlis + 1.26 V. About the formation of M+/M3+ ion in solution and the electropositive character of these metals, the true statement(s) is/are A. Al and Tl form stable Al3+ and Tl3+ ions in aqueous solution. B. Tl+ is more stable than Tl3+. C. Al is more electropositive element than that of thallium.

  1. A only

  2. B only

  3. C only

  4. A and B

  5. B and C
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Standard electrode potential values for two half cell reactions suggest that aluminium has high tendency to make Al3+(aq) ions, whereas Tl3+ is not only unstable in solution but is a powerful oxidising agent also. Thus, Tl+ is more stable in solution than Tl3+. Aluminium being able to form Al3+ ions easily, is more electropositive than thallium.

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