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ChemistryInteger+4 / -1Question 84 of 90

JEE Main 2022 · 29 Jun · Shift 1, Chemistry question 84

A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ______ cm3^3. (Nearest integer)

[Given : Faraday constant F = 96500 C mol−1^{-1} at STP, molar volume of an ideal gas is 22.7 L mol−1^{-1}]

Answer and worked solution

Official answer: 127

Charge. 0.10×7200=7200.10\times7200=720 C =7.46×10−3=7.46\times10^{-3} mol e⁻.

Gases. H2\mathrm{H_2} 3.73×10−33.73\times10^{-3} and O2\mathrm{O_2} 1.87×10−31.87\times10^{-3} mol, total 5.60×10−35.60\times10^{-3} mol ×22700≈127\times22700\approx127 cm³.

Answer: 127

Topics:Electrolysis and Faraday's laws
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