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JEE Main202331 Jan 2023Morning ShiftChemistrySome Basic Concepts of ChemistryActual

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of 11 . 5 g of zinc with excess HCl is L (Nearest integer) (Given : Molar mass of Zn is 65 . 4 g mol - 1 and Molar volume of H 2 at STP = 22 . 7 L )

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Step-by-step solution

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. Zn   +   2 HCl   →   ZnCl 2   +   H 2 ↑ The molar mass of Zn is 65 . 4 g mol -1 Molar volume od H 2 at STP = 22 . 7 L Number of moles of Zn = 11 . 5 65 . 4 = Number of moles of H 2 evolved Volume of   H 2   =   11 . 5 65 . 4   ×   22 . 7   L   =   3 . 99   L   ≈   4   L

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