JEE Advanced · 2019 · 27 May 2019 · Paper 1 · p-Block Elements

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Among and , the total number of molecules containing covalent bond between two atoms of the same kind is ____

Answer: 4

Solution

Examining each molecule for bonds between two atoms of the same element:
  • : Contains B–H–B bridges, but no direct B–B bond. NO.
  • (borazine): Alternating B–N bonds, no B–B or N–N. NO.
  • : Contains N≡N bond. YES.
  • : Contains N–N bond linking two units. YES.
  • (thiosulfate): Contains S–S bond. YES.
  • (peroxydisulfate): Contains O–O (peroxide) bond. YES.

Total: 4 molecules.

JEE Advanced · 2019 · 27 May 2019 · Paper 1 · Numerical answer

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