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JEE Main 20253 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2025 · 3 April · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

Mass of magnesium required to produce 220 mL of hydrogen gas at STP...

Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is
Given : Molar mass of Mg is 24 g mol−124 \mathrm{~g} \mathrm{~mol}^{-1}.

Options

  1. A235.7 g
  2. B0.24 mg
  3. C236 mg
  4. D2.444 g

Correct answer

C. 236 mg

Step-by-step solution

Mg+2HCl→MgCl2+H2\mathrm{Mg}+2 \mathrm{HCl} \rightarrow \mathrm{MgCl}_2+\mathrm{H}_2
Volume H2\mathrm{H}_2 evolved =220ml=220 \mathrm{ml}
Mole of H2=220×10−322.4=\mathrm{H}_2=\frac{220 \times 10^{-3}}{22.4}= mole of Mg used
<br/>∴ Mass of Mg used =220×10−322.4×24<br>=235.7×10−3gm<br>=235.7mg<br/>\begin{aligned}<br />\therefore \text{ Mass of Mg used } & =\frac{220 \times 10^{-3}}{22.4} \times 24 \\<br>& =235.7 \times 10^{-3} \mathrm{gm} \\<br>& =235.7 \mathrm{mg}<br />\end{aligned}
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