JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 16 March 2021, Shift 2, Chemistry Q37

Question 37 of 90 in this shift, Chemistry question 7 of 30, Section A.

The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M

\mathrm{H_3PO_3}

solution and 100 mL of 2 M

\mathrm{H_3PO_2}

solution, respectively, are :

(1)50 mL and 50 mL
(2)100 mL and 50 mL
(3)100 mL and 200 mLOfficial answer
(4)100 mL and 100 mL

Official answer

Option 3

NTA final key.

Chapter: The p-Block Elements
Topic: Group 15 & 16
Idea tested: Phosphorus Oxoacids

Same idea in other shifts

Asked 3× in all

8 Apr 2023, Shift 2 · Q88The ratio of sigma and $\pi$ bonds present in pyrophosphoric acid is ____________.MediumNumerical value
29 Jun 2022, Shift 1 · Q71The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is :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 42 of the 174 JEE Main shifts held from 2017 to 2026.