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AIPMT 2003MCQEasy📈 Topic in 75% papers+4−1
Ques. 1AIPMT 2003

In which of the following systems will the radius of the first orbit (n = 1) be minimum?

  1. doubly ionized lithium
  2. singly ionized helium
  3. deuterium atom
  4. hydrogen atom

Answer

(1) doubly ionized lithium

Solution

For a hydrogen-like species, rn = 0.529 n2Z A

For n = 1, r1 1Z

Z: Li2+ = 3, He+ = 2, deuterium = 1, hydrogen = 1

∴ r1 is minimum for doubly ionized lithium (r1 = 0.5293 0.18 A).

Answer: (1)

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Ques. 2AIPMT 2001

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
Ques. 3AIPMT 2000

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
Ques. 4AIPMT 2000

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

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