JEE Main 2021 · ChemistryMultiple choiceOtherMediumRecall

JEE Main 3 August 2021, Shift 2, Chemistry Q35

Question 35 of 90 in this shift, Chemistry question 5 of 30, Section A.

Which one of the following statements is incorrect? A. The correct order of increasing first ionization enthalpy is Li < H < F. B. Out of the three isotopes of hydrogen, two are radioactive C. Reactivity of halogens is much more than that of hydrogen. D. The size of

\mathrm{H^+}

ion is less than 0.1 pm.

(1)A only
(2)B onlyOfficial answer
(3)C only
(4)D only

Official answer

Option 2

NTA final key.

Chapter: Hydrogen
Topic: Hydrogen and Hydrides
Idea tested: Isotopes of Hydrogen

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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 42 of the 174 JEE Main shifts held from 2017 to 2026.