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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 8 January 2020, Shift 2, Chemistry Q36

Question 36 of 75 in this shift, Chemistry question 11 of 25, Section A.

White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2\mathrm{CO_2} gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y). The basicity of compound (Y) is :
  1. (1)1Official answer
  2. (2)2
  3. (3)3
  4. (4)4

Official answer

Option 1

NTA final key (Jan 2020).

Chapter
The p-Block Elements
Topic
Group 15 & 16
Idea tested
Preparation of Phosphine

Same idea in other shifts

Asked 2× in all
  1. 27 Jun 2022, Shift 1 · Q70Heating white phosphorus with conc. NaOH solution gives mainly :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.