Question:

Hydrogen can be prepared by the action of dil $H_{2}SO_{4}$ on

Updated On: Jul 28, 2022
  • copper
  • iron
  • lead
  • mercury
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The Correct Option is B

Solution and Explanation

Hydrogen cannot be prepared by the action of dil. $H _{2} SO _{4}$ on copper or mercury as these two metals cannot displace hydrogen from acids. Action of dil. $H _{2} SO _{4}$ on $Pb$ stops after some time due to the formation of insoluble $PbSO _{4}$. Only iron reacts rapidly with dil. $H _{2} SO _{4}$ to give $H _{2}$.
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Concepts Used:

Preparation of Dihydrogen

Laboratory Preparation of Dihydrogen is given below:

  • Reacting Zinc with Acid - One common way to produce or prepare dihydrogen gas in the lab is by reacting Zinc with a diluted acid.

\(Zn + H_2SO_4 → ZnSO_4 + H_2\)

\(Zn +HCl → ZnCl_2 + H_2\)

  • Reacting Zinc with Alkaline - Zinc can also react with an aqueous alkali such as Sodium Hydroxide, The sodium and zinc will combine and produces dihydrogen as another product. The reaction is given as:

\(Zn + 2NaOH → Na_2ZnO_2 + H_2\)

  • Commercial Preparation of Dihydrogen - The commercial preparation of hydrogen is a huge industry due to the high demand for hydrogen in the production of fertilizers and the oil-refining process.
    • Electrolysis of Water
    • Lane’s Process
    • From Natural Gas