JEE Main 2020ChemistrySurface ChemistryMediumNumerical

JEE Main 2020 — Surface Chemistry Question with Solution

JEE Main 2020 (07 Jan Shift 2)

Question

The flocculation value of HCl for arsenic sulphide sol is 30 mmolL-1. If H2SO4 is used for the flocculation of arsenic sulphide, the amount, in grams, of H2SO4 in 250ml required for the above purpose is ________
(molecular mass of H2SO4=98 g/mol

Enter your answer

Show full solutionCorrect answer: 0.36
Correct answer
0.36

Step-by-step explanation

For 1L sol 30 mmol of HCl is required
∴ For 1L sol 15 mmol H2SO4 is required
For 250 mL of sol 154×10-3 mmol H2SO4

Mass of H2SO4=3.75 × 10-3×98 = 0.3675 g

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About this question

This is a previous-year question from JEE Main 2020, covering the Surface Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.