An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide.

Question:

An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. $\mathrm{M}$ is :-

  1. $\mathrm{Ca}$

  2. Be

  3. $\mathrm{Mg}$

  4. $\mathrm{Sr}$


Correct Option: , 2

Solution:

[Be]

$\mathrm{BeSO}_{4}$ is water soluble

$\mathrm{Be}(\mathrm{OH})_{2}$ is water insoluble

$\mathrm{BeO}$ is stable to heat

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