Given below are two statements: Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of E^ _ Al ^ 3+ / Al is negative and E^ _ Tl ^ 3+ / Tl is positive. Statement II: The sum of first three ionization enthalpies of boron is very high when compared to

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Given below are two statements: Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of E^ _ Al ^ 3+ / Al is negative and E^ _ Tl ^ 3+ / 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 Al ^ 3+ ion. In the light of the above statements, choose the correct answer from the options given below

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Correct answer: A. Both Statement I and Statement II are true

Statement I: The standard reduction potential E^ _ Al ^ 3+ / Al is -1.66 V, which is highly negative, indicating that aluminium has a strong tendency to lose electrons and is highly electropositive. The standard reduction potential E^ _ Tl ^ 3+ / Tl is +1.26 V, which is positive, indicating that thallium is less electropositive than aluminium. Thus, Statement I is true. Statement II: Boron has a very small atomic size, resulting in a very high sum of its first three ionization enthalpies. This high energy requirement prevents boron from losing three electrons to form B ^ 3+ ions, so it forms only covalent compounds. In contrast, aluminium has a larger size and a significantly lower sum of its first three ionization enthalpies, allowing it to easily form Al ^ 3+ ions in its compounds. Thus, Statement II is true. Both Statement I and Statement II are true. Answer: Both Statement I and Statement II are true

JEE Main Chemistry Question (2026) — Solution

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