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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 9 January 2020, Shift 1, Chemistry Q32

Question 32 of 75 in this shift, Chemistry question 7 of 25, Section A.

B has a smaller first ionization enthalpy than Be. Consider the following statements : (I) it is easier to remove 2p electron than 2s electron (II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be (III) 2s electron has more penetration power than 2p electron (IV) atomic radius of B is more than Be (atomic number B = 5, Be = 4) The correct statements are :
  1. (1)(I), (II) and (III)Official answer
  2. (2)(I), (II) and (IV)
  3. (3)(II), (III) and (IV)
  4. (4)(I), (III) and (IV)

Official answer

Option 1

NTA final key (Jan 2020).

Chapter
Classification of Elements and Periodicity in Properties
Topic
Periodic Trends
Idea tested
Ionization Enthalpy Trends

Same idea in other shifts

Asked 14× in all
  1. 2 Apr 2026, Shift 2 · Q59Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of B > Al > Ga. Statement II:…MediumSingle correct
  2. 6 Apr 2026, Shift 1 · Q71First and second ionization enthalpies of lithium are 520 kJ mol−1^{-1} and 7297 kJ mol−1^{-1} respectively. Energy required to convert…EasyNumerical value
  3. 6 Apr 2026, Shift 2 · Q58In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right…EasySingle correct
  4. 8 Apr 2026, Shift 2 · Q58Match List - I with List - II. List - I (Electronic configuration of neutral atom (where n = 2)) | List - II (1st^{st} Ionization Energy…MediumMatch the list
  5. 3 Apr 2025, Shift 1 · Q60Which of the following statements are correct ? A. The process of adding an electron to a neutral gaseous atom is always exothermic. B.…MediumOther
  6. 8 Apr 2025, Shift 2 · Q56The atomic number of the element from the following with lowest 1st^{st} ionisation enthalpy is :EasySingle correct
  7. 4 Apr 2024, Shift 1 · Q66The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct…MediumOther
  8. 4 Apr 2024, Shift 2 · Q66Given below are two statements : Statement I : The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na < Li < Cl <…MediumTwo statements

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.