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Question

A metal M forms water-soluble sulphate MSO4, water-insoluble hydroxideM(OH)2 and oxide MO which becomes inert on heating. The hydroxide is soluble in NaOH. Then M is:

A
Be
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B
Mg
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C
Cannot be determine as data is incomplete
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D
Sr
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Solution

The correct option is A Be
Option (A) is correct.
Be forms water soluble BeSO4, water insoluble Be(OH)2 and BeO.Be(OH)2 is insoluble in NaOH giving sodium beryllate,Na2BeO2.
On moving down, water solubility of alkaline earth metals decreases.Oxides and hydroxides of alkaline earth metal are basic except Be which is amphoteric.Hence, the metal is Be.

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