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. M is:
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a
Be
b
Sr
c
Ca
d
Mg
answer is A.
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Detailed Solution
Water soluble sulphate and water insoluble hydroxide is ‘Be’. BeO does not have rock-salt structure.