Hydrogen is produced by the reaction:

Which of the following statements are correct?
$(i)$ $NaH_{(s)}$ reacts violently with water to form $NaOH$ and $H_2$
$(ii)$ An example for electron rich hydride is $NH_3$
$(iii)$ Nickel forms saline hydride

The synonym for water gas when used in the production of methanol is:

Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

The reaction of $H_2S$ with $O_2$ produces .....

The equation that represents the water-gas reaction is: