JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumRecall

JEE Main 31 August 2021, Shift 1, Chemistry Q57

Question 57 of 90 in this shift, Chemistry question 27 of 30, Section B.

The number of halogen/(s) forming halic (V) acid is __________.

Official answer

NTA final key.

Chapter: The p-Block Elements
Topic: Group 17 & 18
Idea tested: Nomenclature of Halogen Oxoacids

Same topic in other shifts

All Group 17 & 18 questions

2 Apr 2026, Shift 1 · Q60Given below are two statements : Statement (I) : Oxidising power of halogens decreases in the order $\mathrm{F_2>Cl_2>Br_2>I_2}$ , which is…MediumTwo statements
4 Apr 2026, Shift 1 · Q71According to Lewis theory, the total number of $\sigma$ bond-pairs and lone pair of electrons around the central atom of…MediumNumerical value
4 Apr 2024, Shift 2 · Q72When $\mathrm{MnO_2}$ and $\mathrm{H_2SO_4}$ is added to a salt (A), the greenish yellow gas liberated as salt (A) is :EasySingle correct
8 Apr 2024, Shift 1 · Q65Among the following halogens $\mathrm{F_2}$ , $\mathrm{Cl_2}$ , $\mathrm{Br_2}$ and $\mathrm{I_2}$ Which can undergo disproportionation…EasySingle correct
27 Jan 2024, Shift 1 · Q65Element not showing variable oxidation state is :EasySingle correct
31 Jan 2024, Shift 1 · Q73Give below are two statements: Statement - I: Noble gases have very high boiling points. Statement - II: Noble gases are monoatomic gases.…EasyTwo statements

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.