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BITSAT Chemistry Structure of Atom 2024 BITSAT 2024 (Memory Based Paper 2)

BITSAT Chemistry Question (2024) — Solution

Question

The energy of second orbit of hydrogen atom is -5.45 10^ -19 ~J . What is the energy of first orbit of Li ^ 2+ ion (in J) ?

Options

  1. A. -1.962 10^ -18
  2. B. -1.962 10^ -17
  3. C. -3.924 10^ -17
  4. D. -3.924 10^ -18

Answer

B. -1.962 10^ -17

Step-by-step solution

E_n=-13.6 [ z^2 n^2 ] e V E_1=-13.6 [ 3^2 1^2 ] eV =-122.4 eV =-122.4 1.602 10^ -19 ~J =-1.962 10^ -17 ~J

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