Identify the catalyst used in the reaction: $CO_2 + 2H_2 \xrightarrow{?} CH_3OH$

What is the sum of the number of neutrons and protons in the heaviest isotope of hydrogen?

At $298.2 \ K$,the relationship between the enthalpy of bond dissociation (in $kJ \ mol^{-1}$) for hydrogen $(E_{H})$ and its isotope,deuterium $(E_{D})$,is best described by:

Which one of the following metals forms interstitial hydride easily?

With which of the following does hydrogen combine directly?

Which of the following is used to dry ammonia gas?