Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202621 January 2026Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Given below are two statements : Statement I : The correct order in terms of atomic/ionic radii is Al > Mg > Mg ²⁺> Al ³⁺ . Statement II : The correct order in terms of the magnitude of electron gain enthalpy is Cl > Br > S > O . In the light of the above statements, choose the correct answer from the options given below :

Options

  1. ABoth Statement I and Statement II are false
  2. BBoth Statement I and Statement II are true
  3. CStatement I is false but Statement II is true
  4. DStatement I is true but Statement II is false

Correct answer

C. Statement I is false but Statement II is true

Step-by-step solution

Analyzing Statement I: The order given is Al > Mg > Mg²⁺ > Al³⁺. However, the correct atomic radii order should be Mg > Al because Mg is in group 2 (period 3) while Al is in group 13 (period 3), and moving right across a period decreases radius. The correct order would be Mg > Al > Mg²⁺ > Al³⁺. Therefore, Statement I is FALSE. Analyzing Statement II: Electron gain enthalpy magnitudes follow: Cl (highest, ~349 kJ/mol) > Br (~325) > S (~200) > O (~141). This is because Cl has the highest tendency to gain an electron

Practice Classification of Elements and Periodicity in Properties on Quantrex Academy →

More from Classification of Elements and Periodicity in Properties

The correct statement(s) regarding the periodic properties of elements is(are) 2026Match List-I with List-II. List-I Electronic configuration of neutral atom (where n=2 ) List-II 1^ st Ionization Energy (kJ mol ⁻¹ ) A. ns^2 I. 2080 B. ns^2np^1 II. 899 C. ns^2np^3 2026In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively 2026Given 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⁺/ 2026Given below are two statements : Statement I: The number of pairs among [Al₂O₃, Cr₂O₃] , [Cl₂O₇, Mn₂O₇] , [Na₂O, V₂O₃] and [CO, N₂O] that contain oxides of same nature (acidic, bas 2026Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is F > O > N . Statement II: The oxidation state of oxygen in O 2026The 1^ st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2^ nd ionization enthalpy of Mg is ______. 2026The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about E³⁺ are A. It can act as a reducin 2026 Full Classification of Elements and Periodicity in Properties list All JEE Main PYQs