Properties of Dihydrogen

Complete the following reaction:

${\mathrm{H}}_2\left(\mathrm{g}\right)+?\stackrel{ }{\to }2\mathrm{HCl}\left(\mathrm{g}\right)$

How do you prepare hydrochloric acid from hydrogen and chlorine?

What is the relative atomic mass of hydrogen?

The boiling point of hydrogen is 20K

The fuel of the main engine of the space shuttle is _____.

Hydrogen is used as a rocket fuel. Justify.

Define enthalpy of vapourization of hydrogen.

Write about the electron gain enthalpy of hydrogen.

How many volts does it take to ionize hydrogen?

What is the first ionization energy of hydrogen?

Calculate the density of dihydrogen at $\mathrm{STP}$.

Write the value of density of hydrogen gas.

 The density of hydrogen at $\mathrm{STP}$ is $0.09 \mathrm{g} {\mathrm{L}}^{-1}$.

Explain why there is a difference in the ionic radii of proton and the hydrogen anion. 

A hydrogen ion with a _____ charge has an ionic size greater than that of the hydrogen atom.

Which of the following is correct enthalpy of fusion for hydrogen?

Enthalpy of fusion of hydrogen is $2.18 \mathrm{kJ} {\mathrm{mol}}^{-1}.$

Enthalpy of fusion of hydrogen is _____ $\mathrm{kJ} {\mathrm{mol}}^{-1}$.

Hydrogen is a good reducing agent. Justify.

Which of the following statements are correct?

a) $NaH\left(\mathrm{s}\right)$ reacts violently with water to form $\mathrm{NaOH}$ and ${\mathrm{H}}_2$

b) An example for electron rich hydride is ${\mathrm{NH}}_3$

c) Nickel; forms saline hydride