A metal M readily forms sulphate MSO4 which is water insoluble. 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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answer is D.

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Detailed Solution

BeSO4 and MgSO4 are soluble in water. Only BeO is amphoteric and thus, reacts with NaOH.

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