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A metal `M` readily forms water soluble sulphate `MSO_(4)`, water insoluble hydroxide `M (OH)_(2)` and oxide `MO` which becomes inert on heating. The

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A metal `M` readily forms water soluble sulphate `MSO_(4)`, water insoluble hydroxide `M (OH)_(2)` and oxide `MO` which becomes inert on heating. The hydroxide is soluble in `NaOH`. The `M` is
A. Be
B. Mg
C. Ca
D. Sr
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M is Be which forms water soluble `BeSO_(4),` water insoluble `Be(OH)_(2) and BeO. Be(OH)_(2)` is soluble in NaoH giving sodium beryllate `Na_(2) BeO_(2).`
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