Question
Question: A metal M readily forms water soluble sulphate MSO4 , water insoluble hydroxide M(OH)2 and oxide MO ...
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
A
Be
B
Mg
C
Ca
D
Sr
Answer
Be
Explanation
Solution
BeSO4 is water soluble but Be(OH)2 is water insoluble. Because of amphoteric nature, Be(OH)2 dissolves in
NaOH forming soluble sodium beryllate.
Be(OH)2 + 2NaOH ⟶Na2BeO2 + H2O