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Q.

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

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a

Be

b

Mg

c

Ca

d

Sr

answer is A.

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Detailed Solution

M is Be which forms water soluble BeSO4  water insoluble Be(OH)2  and BeO. Be(OH)2  is soluble in NaOH  giving sodium beryllate Na2BeO2

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