BITSAT2014ChemistryStructure of AtomActual
The wave number of the limiting line in Lyman series of hydrogen is 109678 ~cm ⁻¹ . The wave number of the limiting line in Balmer series of He ⁺ would be :
Options
- A54839 ~cm ⁻¹
- B109678 ~cm ⁻¹
- C219356 ~cm ⁻¹
- D438712 ~cm ⁻¹
Correct answer
B. 109678 ~cm ⁻¹
Step-by-step solution
R _ H =109678 ~cm ⁻¹ Wave number of the limiting line in Balmer series of He ⁺ array l = R _ H Z ² [ 1 n ₁² - 1 n ₂² ] =109678 (2)² [ 1 [2)² - 1 ] =109678 ~cm ⁻¹ array