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Atoms · Question 47

AIPMT 2001MCQEasy📈 Topic in 75% papers+4−1
1

The energy of hydrogen atom in nth orbit is En, then the energy in nth orbit of singly ionised helium atom will be

  1. 4En
  2. En/4
  3. 2En
  4. En/2

Answer

(1) 4En

Solution

For a hydrogen-like ion: En = - 13.6 Z2n2 eV, i.e. E Z2 for the same n.

For H, Z = 1; for He+, Z = 2.

⇒ EHe+ = 22 En = 4En

Answer: (1)

AIPMT 2001

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2

Maximum frequency of emission is obtained for the transition

  1. n = 2 to n = 1
  2. n = 6 to n = 2
  3. n = 1 to n = 2
  4. n = 2 to n = 6
AIPMT 2000
3

When an electron makes a transition from n = 4 to n = 2, then the emitted line spectrum will be

  1. first line of Lyman series
  2. second line of Balmer series
  3. first line of Balmer series
  4. second line of Paschen series
AIPMT 2000

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