JEE Advanced 2026 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Advanced 2026

The correct statement(s) regarding the periodic properties of elements is(are)

(A)Second ionization enthalpy of carbon atom is less than that of boron atom.Correct
(B)Increasing order of ionic radii: Al < Mg < NaCorrect
(C)Under identical conditions, in solid state, the density of potassium metal is more than density of sodium metal.
(D)The H–H bond is weaker than F–F bond.

Answer: (A),(B)

Solution

**(A)** The *second* ionization removes an electron from the mono-cation. * B is — removing an electron breaks a **completely filled, stable sub-shell**, so (B) is large. * C is — the electron comes from the higher-energy, less penetrating orbital, so

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Question ID VK-104795