Hydrogen gains an electron to achieve the configuration of a noble gas. It behaves like which of the following?

Hydrogen has three isotopes $(A)$,$(B)$ and $(C)$. If the number of neutron$(s)$ in $(A)$,$(B)$ and $(C)$ respectively,are $(x)$,$(y)$ and $(z)$,the sum of $(x)$,$(y)$ and $(z)$ is:

Name the classes of hydrides to which $H_2O$,$B_2H_6$ and $NaH$ belong.

Write a short note on Dihydrogen.

Ammonium nitrate decomposes on heating into

Which of the following is a hydride?