Which of the following pairs will not produce $H_2$ gas?

How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

In which of the following reactions,hydrogen is acting as an oxidising agent?

When electric current is passed through an ionic hydride in the molten state,

Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Hydrogen is an environment-friendly fuel.
Reason $R:$ Atomic number of hydrogen is $1$ and it is a very light element.
In the light of the above statements,choose the correct answer from the options given below: