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Saturday, 10 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctHardRecall

JEE Main 13 April 2023, Shift 2, Chemistry Q67

Question 67 of 90 in this shift, Chemistry question 7 of 30, Section A.

Better method for preparation of BeF2\mathrm{BeF_2}, among the following is
  1. (1)Be+F2→ΔBeF2\mathrm{Be + F_2 \xrightarrow{\Delta} BeF_2}
  2. (2)(NH4)2BeF4→ΔBeF2\mathrm{(NH_4)_2BeF_4 \xrightarrow{\Delta} BeF_2}Official answer
  3. (3)BeO+C+F2→ΔBeF2\mathrm{BeO + C + F_2 \xrightarrow{\Delta} BeF_2}
  4. (4)BeH2+F2→ΔBeF2\mathrm{BeH_2 + F_2 \xrightarrow{\Delta} BeF_2}

Official answer

Option 2

NTA final key.

Chapter
The s-Block Elements
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.