Which of the following methods is used to prepare dihydrogen with purity greater than $99.95 \%$?

Which of the following is a synthesis gas?

When $1:2$ equivalence ratio of the gases $X$ and $Y$ are heated to $573 \ K - 673 \ K$ at $200-300 \ atm$ in the presence of $ZnO-Cr_2O_3$ catalyst,methanol is formed. Here,the gases $X$ and $Y$ are $X$ and $Y$ respectively.

Which of the following is used to dry ammonia gas?

Identify the catalyst used to transform carbon monoxide from water gas into carbon dioxide.

Discuss the consequence of high enthalpy of $H-H$ bond in terms of chemical reactivity of dihydrogen.