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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2023 · Paper II, Chemistry · Q8 of 120

Geo-Scientist Prelims 2023 Chemistry Q8: Solutions of alkali metals in liquid ammonia are deep blue…

Questions-block / alkali metals in liquid NH₃

Solutions of alkali metals in liquid ammonia are deep blue irrespective of the type of alkali metal dissolved. The deep blue colour is due to :

  1. (a) Formation of ammoniates of alkali metals
  2. (b) Generation of ammoniated electrons in solution
  3. (c) Formation of alkali metal amides
  4. (d) Formation of alkali metal hydroxides

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