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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 31 August 2021, Shift 2, Chemistry Q35

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

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Lithium salts are hydrated. Reason (R) : Lithium has higher polarising power than other alkali metal group members. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are correct and (R) is the correct explanation of (A).
  2. (2)Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).Official answer
  3. (3)(A) is correct but (R) is not correct.
  4. (4)(A) is not correct but (R) is correct.

Official answer

Option 2

NTA final key.

Chapter
The s-Block Elements
Topic
s-Block Elements
Idea tested
Hydration Enthalpy Trends

Same idea in other shifts

Asked 4× in all
  1. 6 Apr 2023, Shift 2 · Q67Ion having highest hydration enthalpy among the given alkaline earth metal ions is:EasySingle correct
  2. 11 Apr 2023, Shift 2 · Q88Mg(NO3)2⋅XH2O\mathrm{Mg(NO_3)_2{\cdot}XH_2O} and Ba(NO3)2⋅YH2O\mathrm{Ba(NO_3)_2{\cdot}YH_2O}, represent formula of the crystalline forms of nitrate salts. Sum…MediumNumerical value
  3. 25 Jun 2022, Shift 1 · Q66Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution ?EasySingle correct

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.