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BITSAT2018Chemistrys Block ElementsActual

Which of the following property of alkaline earth metal increases with their atomic number?

Options

  1. Aelectronegativity
  2. Bsolubility of their hydroxides in water
  3. Csolubility of their sulphate in water
  4. Dionisation energy

Correct answer

B. solubility of their hydroxides in water

Step-by-step solution

The lattice energy of the hydroxides of alkaline earth metal decreases more rapidly than their hydration energy leading to more negative value of ΔH sol down the group. More negative is ΔH sol , more is the solubility of compounds. Hence the solubility of hydroxides of alkaline earth metal increases with their atomic number.

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