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JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 27 June 2022, Shift 1, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

Heating white phosphorus with conc. NaOH solution gives mainly :

(1) $\mathrm{Na_3P}$ and $\mathrm{H_2O}$
(2) $\mathrm{H_3PO}$ and NaH
(3) $\mathrm{P(OH)_3}$ and $\mathrm{NaH_2PO_4}$
(4) $\mathrm{PH_3}$ and $\mathrm{NaH_2PO_2}$ Official answer

Official answer

Option 4

NTA final key.

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

Same idea in other shifts

Asked 2× in all

8 Jan 2020, Shift 2 · Q36White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of $\mathrm{CO_2}$ gives phosphine and compound (X).…MediumSingle 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.