The  energy needed to convert helium atom  to He +2 is -79eV. The first ionization energy of this atom is about 

1. 65.4eV

2. 51.8eV

3. 24.6eV

4. 27.2eV

Subtopic:  Bohr's Theory |
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Elements upto atomic number 103 have been synthesized and studied. If a newly discovered element is found to have an atomic number 106, its electronic configuration will be -

1. [Rn] 5f14, 6d4, 7s2

2. [Rn] 5f14, 6d1, 7s2 7p3

3. [Rn] 5f14, 6d, 7s0

4. [Rn] 5f14, 6d5, 7s1

Subtopic:  AUFBAU Principle |
From NCERT
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The most probable radius (in pm) for finding the electron in He+ is -

1. 0

2. 52.9

3. 26.5

4. 105.8

Subtopic:  Bohr's Theory |
 56%
From NCERT
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The mass ratio of photons corresponding to the first lines of the Lymann and the Balmer series of the atomic spectrum of hydrogen is :

1. 5 : 27 2. 1 : 4
3. 27 : 5 4. 4 : 1
Subtopic:  Hydrogen Spectra |
 56%
From NCERT
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An electron, practically at rest, is initially accelerated through a potential difference of 100 volts. It then has a de Broglie wavelength=λ1Å. It then get retarded through 19 volts and then it has wavelength λ2 Å. A further retardation through 32 volts changes the wavelength to λ3.

What is (λ3-λ2)/λ1?

1. 20/41

2. 10/63

3. 20/63

4. 10/41

Subtopic:  De Broglie Equation |
 58%
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Which of the following has the maximum number of  unpaired electons-

1. Mg2+

2. Ti3+

3. V3+

4. Fe2+

Subtopic:  Number of Electron, Proton & Neutron |
 72%
From NCERT
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There are three energy levels in an atom. How many spectral lines are possible in its emission spectra?

1. One

2. Two

3. Three

4. Four

Subtopic:  Type of Spectra |
 75%
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Azimuthal quantum number defines -

1. e/m ratio of electron

2. Spin of electron

3. Angular momentum of electron

4. Magnetic momentum of electron

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 80%
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For the energy levels in an atom, which one of the following statements is correct -

1. There are seven principal electron energy levels

2. The second principal energy level can have two 'sub energy levels and contains a maximum of eight electrons

3. The energy level can have a maximum of 32 electrons

4. The 4s sub-energy level is at higher energy than the 3d sub-energy level

Subtopic:  Hydrogen Spectra |
 55%
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Arrange the following particles in increasing order of values of e/m ratio: Electron(e), proton(p), neutron(n) and α-particle(α)

1. n,p,e,α

2. n,α,p,e

3. n,p,α,e

4. e,p,n,α

Subtopic:  Introduction of Atomic Structure |
 57%
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