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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceAssertion–reasonEasyCalculation

JEE Main 10 April 2023, Shift 2, Chemistry Q80

Question 80 of 90 in this shift, Chemistry question 20 of 30, Section A.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : 3.1500g of hydrated oxalic acid dissolved in water to make 250.0 mL solution will result in 0.1 M oxalic acid solution. Reason R : Molar mass of hydrated oxalic acid is 126 g mol−1\mathrm{mol^{-1}} In the light of the above statements, choose the correct answer from the options given below.
  1. (1)Both A and R are true and R is the correct explanation of AOfficial answer
  2. (2)Both A and R are true but R is NOT the correct explanation of A
  3. (3)A is true but R is false
  4. (4)A is false but R is true

Official answer

Option 1

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
  1. 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
  2. 29 Jan 2024, Shift 1 · Q81A solution of H2SO4\mathrm{H_2SO_4} is 31.4% H2SO4\mathrm{H_2SO_4} by mass and has a density of 1.25g/mL. The molarity of the H2SO4\mathrm{H_2SO_4}…EasyNumerical value
  3. 30 Jan 2024, Shift 1 · Q81The mass of sodium acetate (CH3COONa\mathrm{CH_3COONa}) required to prepare 250 mL of 0.35 M aqueous solution is ________ g. (Molar mass of…EasyNumerical value
  4. 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
  5. 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
  6. 4 Aug 2021, Shift 1 · Q51A solution of H2SO4\mathrm{H_2SO_4} has 30% H2SO4\mathrm{H_2SO_4} by mass and a density of 1.25 g mL−1^{-1}. The molarity of the solution is…EasyNumerical value
  7. 26 Aug 2021, Shift 2 · Q51100 mL of Na3PO4\mathrm{Na_3PO_4} solution contains 3.45 g of sodium. The molarity of the solution is __________ ×10−2\times 10^{-2} mol…MediumNumerical value
  8. 31 Aug 2021, Shift 1 · Q51The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4⋅2H2O\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.