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Q.

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 a 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

  • The size of the alkali earth metal atom increases down the group.
  • Down the group alkali earth metals form insoluble sulphates 
  • Down the group alkali earth metals form soluble hydroxides
  • Down the group stability to the heat of alkali earth metal oxides decreases
  • Among the alkali earth metal atoms beryllium upon dissolving in sodium hydroxide solution it  does not form any rock-salt structure
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