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Atoms · Question 46

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

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)

AIPMT 2003

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2

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
AIPMT 2001
3

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
4

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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