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Q.

A metal $M$ readily forms water soluble sulphate, and water insoluble hydroxide $M {(OH)}_{2}$ . Its oxide $M O$ is amphoteric, hard and having high melting point. The alkaline earth metal $M$ must be :

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a

$Mg$

b

$Be$

c

$Ca$

answer is B.

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Detailed Solution

The insoluble in water berillium hydroxide $(Be (OH)_{2})$ form

Amphoteric $Be (OH)_{2}$ interacts with $NaOH$ .

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