JEE Main 2026 · 6 Apr · Shift 1 · Chemistry Q59

← JEE Main 2026 · 6 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 59 of 75

Given below are two statements:

Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of $E^\circ_{\ce{Al^3+}/\ce{Al}}$ is negative and $E^\circ_{\ce{Tl^3+}/\ce{Tl}}$ is positive.

Statement II: The sum of first three ionization enthalpies of boron is very high when compared to that of aluminium. Due to this reason boron forms covalent compounds only and aluminium forms $\ce{Al^3+}$ ion.

In the light of the above statements, choose the correct answer from the options given below

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Answer and worked solution

Official answer: A

Statement I. $E^\circ(\ce{Al^3+}/\ce{Al})=-1.66$ V and $E^\circ(\ce{Tl^3+}/\ce{Tl})=+1.26$ V. So Al is the more electropositive. True.

Statement II. Boron's very high sum of the first three ionisation enthalpies prevents $\ce{B^3+}$ from forming, so boron forms only covalent compounds. Aluminium forms $\ce{Al^3+}$ . True.

(A)

Topics:Group 13

← Previous question Next question →

JEE Main 2026 · 6 Apr · Shift 1, Chemistry question 59