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ChemistryJEE Main 22 Jan 2026, Shift 1·Q4·MCQ·Easy–moderate

Structure of Atom · Bohr model excitation energy

The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is J mol−1^{-1}.

Given : RH=2.18×10−11R_\mathrm{H} = 2.18\times10^{-11} ergs.

  1. (1)1.635×10−181.635\times10^{-18}
  2. (2)9.835×1059.835\times10^{5}
  3. (3)9.835×10129.835\times10^{12}
  4. (4)1.635×10−111.635\times10^{-11}

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See the full 22 Jan 2026, Shift 1 paper