Assertion (A) $\mathrm{MgO}, \mathrm{CaO}, \mathrm{SrO}$ and BaO are insoluble in water.
Reason ( R ) In aqueous medium the basic strength of $\mathrm{MgO}, \mathrm{CaO}, \mathrm{SrO}$ and BaO increases with increase in the atomic number of metal.
The correct option among the following is
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.