Which of the following is radioactive?

Oxidation state of hydrogen in compound $X$ is $-1$ and in compound $Y$ is $+1$. $X$ and $Y$ are respectively

Metals of groups $7$,$8$,and $9$ do not form metallic hydrides. This is termed as

When steam is passed over red hot iron,the substances formed are

What do you expect the nature of hydrides is,if formed by elements of atomic numbers $15$,$19$,$23$,and $44$ with dihydrogen? Compare their behaviour towards water.

What is the structural formula of lithium tetrahydridoaluminate?