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An alkali 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:

1) Sr

2) Ca

3) Mg

Answers (1)

best_answer

Forms water soluble sulphate.

  • MgSO4? → soluble.

  • CaSO4? → sparingly soluble.

  • SrSO4? → insoluble.

So, the metal is most likely Mg.

Forms water insoluble hydroxide.

  • Mg(OH)2? → insoluble.

  • Ca(OH)2? (slaked lime) → sparingly soluble.

  • Sr(OH)2? → soluble.

Again, the metal is most likely Mg.

Oxide MO is very stable to heat.

  • MgO has highest thermal stability among given choices.

  • CaO,SrO decompose more easily.

Does not have rock-salt structure.

  • MgO → has NaCl (rock-salt) structure? → Actually, MgO has the rock-salt structure.

  • The exception is BeO (wurtzite/zinc blende structure).

  • Since Be is not in the options, and MgO is indeed highly stable and close to the given properties, the best answer from the options is still Mg.

Correct Answer: M = Mg (Magnesium)

Posted by

Saumya Singh

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