Question:

The metal that products $H_2$ with both dil $HCl$ and $NaOH (aq)$ is

Updated On: Jul 14, 2022
  • Zn
  • Mg
  • Ca
  • Fe
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The Correct Option is A

Solution and Explanation

$Zn$ produces $H _{2}$ with both dil. $HCl$ and $NaOH ( aq )$. The corresponding reactions are: $Zn +2 HCl \rightarrow ZnCl _{2}+ H _{2} \uparrow$ $Zn +2 NaOH \rightarrow Na _{2} ZnO _{2}+ H _{2} \uparrow$
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Concepts Used:

Dihydrogen

Dihydrogen is the homonuclear diatomic molecule built from two hydrogen atoms. This molecule characterizes a covalent bond between two hydrogen atoms, satisfying each of their required pair configurations.

Structure of Dihydrogen:

The dihydrogen molecule characterizes a single covalent bond between the two hydrogen atoms that comprise it. This molecule has a linear shape and is nonionic in nature. Each hydrogen atom comes up with one electron towards the covalent bond.

Properties of Dihydrogen:

  • At Standard Temperature and Pressure (STP), dihydrogen exists in the gaseous state.
  • The melting point of H2 is 13.99 Kelvin. Transforming this value to the celsius scale, the melting point of dihydrogen can be expressed as -259.16 degrees celsius.
  • The boiling point correlated with dihydrogen corresponds to 20.271 on the Kelvins scale. Transforming this value into the celsius scale, the boiling point of H2 can be represented as -252.879 degrees celsius.
  • The latent heat of fusion associated with the H2 molecule correlates to 0.117 kilojoules per mole.
  • The latent heat of vaporization (also known as the enthalpy of vaporization) of dihydrogen is equivalent to 0.904 kilojoules per mole.