The E^° values are given as: E^ Al+/Al = +0.55 V and E^ Tl+/Tl = -0.34 V; E^ Al^3+/Al = -1.66 V and E^ Tl^3+/Tl = +1.26 V. Identify the incorrect statement.

NEET 2023 Phase 2 · ChemistryGalvanic & EMFPrevious Year Question

The $E^{\circ}$ values are given as: $E_{Al X^{+} / Al}^{\circ} = + 0.55 V$ and $E_{Tl X^{+} / Tl}^{\circ} = - 0.34 V$ ; $E_{Al X^{3 +} / Al}^{\circ} = - 1.66 V$ and $E_{Tl X^{3 +} / Tl}^{\circ} = + 1.26 V$ . Identify the incorrect statement.

Answer: (D) $Tl X^{3 +}$ is a better reducing agent than $Tl X^{+}$ .. \textbf{Answer:} (D) $Tl X^{3 +}$ is a better reducing agent than $Tl X^{+}$ — this statement is INCORRECT.

A. $Al X^{+}$ is unstable in solution.
B. $Tl$ can be more easily oxidised to $Tl X^{+}$ than to $Tl X^{3 +}$ .
C. $Al$ is more electropositive than $Tl$ .
D. $Tl X^{3 +}$ is a better reducing agent than $Tl X^{+}$ .✓

Correct Answer

(D) $Tl X^{3 +}$ is a better reducing agent than $Tl X^{+}$ .

Solution & Explanation

\textbf{Answer:} (D) $Tl X^{3 +}$ is a better reducing agent than $Tl X^{+}$ — this statement is INCORRECT. \textbf{Solution:} A more positive (higher) reduction potential means a stronger oxidising agent and a weaker reducing agent. $E_{Tl X^{3 +} / Tl}^{\circ} = + 1.26 V$ is highly positive, so $Tl X^{3 +}$ is a strong oxidising agent, NOT a reducing agent. Hence (D) is incorrect. Checking the others: (A) For $Al X^{+}$ , $E_{Al X^{+} / Al}^{\circ} = + 0.55 V$ (reduction favoured) while $E_{Al X^{3 +} / Al}^{\circ} = - 1.66 V$ ; $Al X^{+}$ tends to disproportionate, so it is unstable — correct. (B) $Tl$ is oxidised to $Tl X^{+}$ ( $E_{Tl X^{+} / Tl}^{\circ} = - 0.34 V$ ) far more easily than to $Tl X^{3 +}$ — correct. (C) $Al X^{3 +} / Al$ ( $- 1.66 V$ ) is much more negative than the $Tl$ couples, so $Al$ is more electropositive — correct.

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The E∘ values are given as: EAlX+/Al∘​=+0.55 V and ETlX+/Tl∘​=−0.34 V; EAlX3+/Al∘​=−1.66 V and ETlX3+/Tl∘​=+1.26 V. Identify the incorrect statement.

Solution & Explanation

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The $E^{\circ}$ values are given as: $E_{Al X^{+} / Al}^{\circ} = + 0.55 V$ and $E_{Tl X^{+} / Tl}^{\circ} = - 0.34 V$ ; $E_{Al X^{3 +} / Al}^{\circ} = - 1.66 V$ and $E_{Tl X^{3 +} / Tl}^{\circ} = + 1.26 V$ . Identify the incorrect statement.