JEE Main 2026 — Classification of Elements and Periodicity in Properties Question with Solution
JEE Main 2026 (06 April Shift 1)
Question
Given below are two statements:
Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of is negative and 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 ion.
In the light of the above statements, choose the correct answer from the options given below
Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of is negative and 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 ion.
In the light of the above statements, choose the correct answer from the options given below
Choose an option
Show full solutionCorrect option: A
Correct answer
ABoth Statement I and Statement II are true
Step-by-step explanation
Statement I: The standard reduction potential is V, which is highly negative, indicating that aluminium has a strong tendency to lose electrons and is highly electropositive. The standard reduction potential is 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 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 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
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 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 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
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This is a previous-year question from JEE Main 2026, covering the Classification of Elements and Periodicity in Properties chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.