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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 · 2026 · Paper II, Chemistry · Q15 of 120

Geo-Scientist Prelims 2026 Chemistry Q15: Which one of the following is the most unstable in nature ?

Questionp-block / group 15 pentahalides

Which one of the following is the most unstable in nature ?

  1. (a) PF₅
  2. (b) AsCl₅
  3. (c) SbCl₅
  4. (d) BiF₅

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