Which of the following set of metals have strong tendency to form super oxides?
Identify the correct statements with respect to compounds of beryllium.
I. Beryllium oxide is amphoteric in nature.
II. Beryllium hydride is formed by the reaction of beryllium with hydrogen.
III. Beryllium hydride is formed by the reaction of beryllium chloride with lithium aluminium hydride.
IV. Beryllium sulpahte is the least soluble sulphate among the sulphates of alkaline earth metals.
In group 13 of the long form of periodic table an element $X$ has a boiling point of $T_2(\mathrm{~K})$ and melting point of $T_1(\mathrm{~K})$. Identify the element $X$ for which $T_2-T_1(\mathrm{~K})$ is maximum
The dioxides and monoxides of elements $X$ and $Y$ are amphoteric in nature. $X$ and $Y$ are respectively