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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:
A. (a)Mg
B. (b)Ba
C. (c )Ca
D. (d)Be

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Correct Answer - D
`BeSO_(4)` and `MgSO_(4)` are soluble in water. Only `Be(OH)_(2)` being amphoteric reacts with `NaOH.`

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