JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer The solubility in water of sulphates down the \[Be\] group is \[Be>Mg>>Ca>Sr>Ba\]. This is due to [CBSE PMT 1995]

    A) High heat of solvation for smaller ions like \[B{{e}^{2+}}\]

    B) Increasing molecular weight

    C) Decreasing lattice energy

    D) Increase in melting points

    Correct Answer: A

    Solution :

    The hydration energy decreases from \[B{{e}^{+2}}\] to \[B{{a}^{+2}}\]. This causes the decrease in the solubilities of the sulphates in this order. In other words, the solubilities decreases with increase in the ionic size.


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