Question

Which of the following atomic and physical properties of hydrogen is false?

jipmer 2015

• A. $\text{Hydrogen > Deuterium >Tritium; (melting point /K)}$
• B. $\text{Hydrogen < Deuterium < Tritium ;(density}/g{L}^{-1})$
• C. $\text{Hydrogen > Deuterium > Tritium ;(\% relative abundance)}$
• D. $\text{Hydrogen < Deuterium < Tritium ;(boiling point /K)}$

Answer 1

The correct option is A $\text{Hydrogen > Deuterium >Tritium; (melting point /K)}$

Since melting and boiling points increase with increase in mass, the melting and boiling point order is: hydrogen < deuterium < tritium.
Density is also directly proportional to mass, the density order will also be hydrogen < deuterium < tritium.

The abundance of hydrogen protium is more than that of deuterium and tritium is rare.

$\begin{array}{cccc}Property& Tritium& Deuterium& Hydrogen\\ Meltingpoint& 20.62& 18.5& 13.9\\ Boilingpoint& 24.9& 23.5& 20.4\\ Denisty& 0.27& 0.18& 0.09\\ Relativeabundance\left(\%\right)& {10}^{-15}& 0.016& 99.984\end{array}$

By considering the above data, the property mentioned in statement $\left(a\right)$ is false.