JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 26 August 2021, Shift 2, Chemistry Q51

Question 51 of 90 in this shift, Chemistry question 21 of 30, Section B.

100 mL of

\mathrm{Na_3PO_4}

solution contains 3.45 g of sodium. The molarity of the solution is __________

\times 10^{-2}

mol

\mathrm{L^{-1}}

. (Nearest integer) [Atomic Masses - Na : 23.0 u, O : 16.0 u, P : 31.0 u]

Official answer

NTA final key.

Chapter: Some Basic Concepts of Chemistry
Topic: Mole Concept
Idea tested: Molarity Calculation

Same idea in other shifts

Asked 16× in all

4 Apr 2024, Shift 1 · Q61The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is : (Given : Molar Mass Na : 23 and Cl : 35.5…EasySingle correct
29 Jan 2024, Shift 1 · Q81A solution of $\mathrm{H_2SO_4}$ is 31.4% $\mathrm{H_2SO_4}$ by mass and has a density of 1.25g/mL. The molarity of the $\mathrm{H_2SO_4}$ …EasyNumerical value
30 Jan 2024, Shift 1 · Q81The mass of sodium acetate ( $\mathrm{CH_3COONa}$ ) required to prepare 250 mL of 0.35 M aqueous solution is ________ g. (Molar mass of…EasyNumerical value
10 Apr 2023, Shift 2 · Q80Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : 3.1500g of hydrated…EasyAssertion–reason
26 Jul 2022, Shift 1 · Q85When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The…MediumNumerical value
26 Jun 2022, Shift 1 · Q61A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is :…EasySingle correct
4 Aug 2021, Shift 1 · Q51A solution of $\mathrm{H_2SO_4}$ has 30% $\mathrm{H_2SO_4}$ by mass and a density of 1.25 g mL $^{-1}$ . The molarity of the solution is…EasyNumerical value
31 Aug 2021, Shift 1 · Q51The molarity of the solution prepared by dissolving 6.3 g of oxalic acid ( $\mathrm{H_2C_2O_4\cdot 2H_2O}$ ) in 250 mL of water in mol…EasyNumerical value

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.