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Question

If the energy of the second Bohr's orbit in H-atom is −328 kJ mol−1, then what is the energy of the fourth Bohr orbit?

A
82kJmol1
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B
41kJmol1
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C
1312kJmol1
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D
164kJmol1
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Solution

The correct option is A 82kJmol1
If energy of an electron in the nth orbit is En, according to the Bohr's atomic model is
EnZ2n2,
Thus, E4E2=2242=14

Now, E2=328 kJ mol1,
E4=14×E2=82 kJ mol1
Hence, option A is correct.

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