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A metal M readily forms water soluble su...

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

A

`Be`

B

`Mg`

C

`Ca`

D

`Sr`

Text Solution

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The correct Answer is:
To solve the problem step-by-step, we need to analyze the properties of the metal M based on the information provided in the question. ### Step 1: Identify the characteristics of metal M - Metal M forms a water-soluble sulfate. - Metal M forms a water-insoluble hydroxide, \( M(OH)_2 \). - The oxide \( MO \) is amphoteric, hard, and has a high melting point. ### Step 2: Determine the group of metal M Since the question specifies that M is an alkaline earth metal, we know it belongs to Group 2 of the periodic table. The alkaline earth metals include: - Beryllium (Be) - Magnesium (Mg) - Calcium (Ca) - Strontium (Sr) - Barium (Ba) ### Step 3: Analyze the solubility of sulfates and hydroxides - As we move down the group in alkaline earth metals, the solubility of sulfates generally decreases. - Conversely, the solubility of hydroxides increases down the group. Given that metal M forms a water-soluble sulfate, we can infer that it is likely to be one of the upper alkaline earth metals (Beryllium or Magnesium), since the solubility of sulfates decreases down the group. ### Step 4: Consider the properties of hydroxides The question states that the hydroxide \( M(OH)_2 \) is water-insoluble. - Beryllium hydroxide (Be(OH)₂) is indeed water-insoluble. - Magnesium hydroxide (Mg(OH)₂) is also water-insoluble, but it is less soluble than beryllium hydroxide. ### Step 5: Evaluate the oxide properties The oxide \( MO \) is amphoteric, hard, and has a high melting point. - Beryllium oxide (BeO) is known to be amphoteric, hard, and has a high melting point. - Magnesium oxide (MgO) is also amphoteric but is less hard compared to beryllium oxide. ### Step 6: Conclusion Based on the analysis: - The metal M must be Beryllium (Be) because: - It forms a water-soluble sulfate (BeSO₄). - It forms a water-insoluble hydroxide (Be(OH)₂). - Its oxide (BeO) is amphoteric, hard, and has a high melting point. Thus, the alkaline earth metal M must be **Beryllium (Be)**.
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