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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 27 August 2021, Shift 2, Chemistry Q35

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

Choose the correct statement from the following :
  1. (1)Among the alkali metal halides, LiF is least soluble in water.Official answer
  2. (2)LiF has least negative standard enthalpy of formation among alkali metal fluorides.
  3. (3)The low solubility of CsI in water is due to its high lattice enthalpy.
  4. (4)The standard enthalpy of formation for alkali metal bromides becomes less negative on descending the group.

Official answer

Option 1

NTA final key.

Chapter
The s-Block Elements
Topic
s-Block Elements
Idea tested
Anomalous Solubility of Specific Alkali Halides

Same idea in other shifts

Asked 2× in all
  1. 26 Jul 2022, Shift 2 · Q69Given below are two statements: one is labelled as **Assertion A** and the other is labelled as **Reason R**. **Assertion A:** LiF is…MediumAssertion–reason

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.