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COMEDK2012ChemistryStructure of Atom

Which of the following electron transitions in the H-atom will release the largest amount of energy?

Options

  1. An=3 to n=2
  2. Bn=2 to n=1
  3. Cn=5 to n=2
  4. Dn=6 to n=2

Correct answer

B. n=2 to n=1

Step-by-step solution

The energy for electron transition is aligned & E=-13.6 Z² [ 1 n₂² - 1 n₁² ] & E ( 1 n₂² - 1 n₁² ) aligned For n=2 to n=1 value of E is highest. E₂=13.6 (0.75)=10.2 For n=6 to n=2 aligned E &=-13.6 ( 1 36 - 1 4 ) &=13.6 8 36 =3.02 aligned It is less than E₂ . For electron transition n=2 to n=1 , energy released is maximum.

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