According to Mendeleev's Periodic Table, which element’s properties matched up remarkably well with eka-aluminium?

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SSC CPO 2024 Official Paper-I (Held On: 29 Jun, 2024 Shift 1)
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  1. Titanium
  2. Germanium
  3. Gallium
  4. Scandium

Answer (Detailed Solution Below)

Option 3 : Gallium
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The correct answer is Gallium

Key Points

  • Gallium is the element whose properties matched up remarkably well with eka-aluminium according to Mendeleev's Periodic Table.
  • Mendeleev had predicted the existence and properties of eka-aluminium, which was later discovered and named gallium.
  • Gallium's properties such as its density, melting point, and the formation of a hydroxide were very close to Mendeleev's predictions for eka-aluminium.

Additional Information

  • Dmitri Mendeleev created the Periodic Table and predicted the existence of elements that were not yet discovered.
  • He used the properties of known elements to predict the properties of the undiscovered ones, demonstrating the periodic trends in the elements.
  • Gallium was discovered by the French chemist Paul-Émile Lecoq de Boisbaudran in 1875.
  • The discovery of gallium and its properties were a significant validation of Mendeleev's periodic table.
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