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The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements3 Marks
Question
The alkali and alkaline earth metals characterized by their large atomic sizes, lower ionisation enthalpies, invariable +1 oxidaton state and solubility of their oxo salts. In the light of these features describe the nature of oxides, halides and oxo salts.
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Answer

Nature of oxides: They forms basic oxides. Basic character of oxides increases down the group because electropositive character increases, solubility in water increases.
Nature of halide:
  • All of them form ionic halides except lithium which forms covalent halides.
  • All are soluble in water but lithium halides are more soluble in organic solvents.
Nature of oxo salts:
  • Carbonates are thermally stable and soluble in water except $\mathrm{Li}_2 \mathrm{CO}_3$.
  • Sulphates are soluble in water
  • Hydrogen carbonates are soluble in water
  • Nitrates are soluble in water.

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