Liquid ammonia is used in refrigeration because of its

Which of the following explanations is best for not placing hydrogen with alkali metals or halogens?

Asthma patients use a mixture of ........... for breathing.

From which source is the maximum amount of hydrogen obtained?

The charring of sugar takes place when treated with concentrated $H_2SO_4$. What is the type of reaction involved in it?

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