When a mixture of methane and steam is passed over a nickel catalyst supported on alumina at $725\,^oC$,the product obtained is:

Consider the following statements:
$1.$ Atomic hydrogen is obtained by passing hydrogen through an electric arc.
$2.$ Hydrogen gas will not reduce heated aluminium oxide.
$3.$ Finely divided palladium adsorbs large volume of hydrogen gas.
$4.$ Pure nascent hydrogen is best obtained by reacting $Na$ with $C_2H_5OH$.
Which of the above statements is/are correct?

In the synthesis of which compound is water gas used?

What is Carbogen?

The difference between heat of adsorption of ortho and para hydrogen is $......... \ kJ \ mol^{-1}$.

The property of hydrogen which distinguishes it from other alkali metals is