JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 3 August 2021, Shift 1, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

The strength of 25 volume solution of hydrogen peroxide in percentage is ________ ×

10^{-1}

. (Nearest integer)

Official answer

NTA final key.

Chapter: Hydrogen
Topic: Mole Concept
Idea tested: Volume Strength of H2O2

Same topic in other shifts

All Mole Concept questions

4 Apr 2026, Shift 1 · Q51Number of moles and number of molecules in $1.4187$ L of $\mathrm{SO_2}$ at STP respectively areEasySingle correct
4 Apr 2026, Shift 1 · Q73 $2.0$ g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave $3.36$ g of AgBr. The percentage of carbon in the compound (X)…MediumNumerical value
4 Apr 2026, Shift 2 · Q51The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP is:EasySingle correct
5 Apr 2026, Shift 1 · Q54What is the mole fraction of water in 10% by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and…EasySingle correct
6 Apr 2026, Shift 1 · Q51An oxide of iron contains 69.9% iron, its empirical formula, is: (Given : Molar mass of Fe and O are 56 and 16 g mol $^{-1}$ respectively.)EasySingle correct
6 Apr 2026, Shift 2 · Q51Which of the following contain the same number of atoms ? (Given : Molar mass in g mol $^{-1}$ of H, He, O and S are 1, 4, 16 and 32…EasyOther

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.