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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 · 2022 · Paper II, Chemistry · Q31 of 120

Geo-Scientist Prelims 2022 Chemistry Q31: Which one of the following represents the correct order of acidic…

Questionp-block / Lewis acidity of boron halides

Which one of the following represents the correct order of acidic strength among BBr₃, BCl₃, BF₃ and BI₃?

  1. (a) BI₃ < BBr₃ < BCl₃ < BF₃
  2. (b) BF₃ < BCl₃ < BBr₃ < BI₃
  3. (c) BF₃ < BBr₃ < BCl₃ < BI₃
  4. (d) BF₃ < BCl₃ < BI₃ < BBr₃

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