A metal M readily forms its sulphate MSO...

A metal M readily forms its sulphate `MSO_(4)` which is water soluble. It forms oxide `MO` which becomes inert on heating. It forms insoluble hydroxide which is soluble in `NaOH`. The metal `M` is:

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On moving down, water solubility of alkaline earth metals decreases . Oxides and hydroxides of alkaline earth metals are basic , except Be, which gives amphoteric . Hence, metal is Be.

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