Which transition of electron in the hydrogen atom emits maximum energy:

(A) 2  1

(B) 1  4

(C) 4  3

(D) 3  2

Concept Questions :-

Hydrogen Spectra
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The spectrum of He-atom may be considered similar to the spectrum of - 

(A)H

(B)Li+

(C) Na

(D) He+

Concept Questions :-

Hydrogen Spectra
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Frequency ratio between violet (400nm) and red (750nm) radiations in the visible spectrum, is-

(A) 8/15

(B) 4/15

(C) 15/8

(D) None of these

Concept Questions :-

EMT Radiation
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The Compton wavelength for an electron is , calculate λ(1- cos θ) for a scattering angle  θ = π/3. What is the maximum value for λ ?

(A) 0.024 Å, 0.048 Å

(B) 0.012 Å, 0.048 Å

(C)0.012 Å, 0.024 Å

(D) 0.006 Å, 0.012 Å

Concept Questions :-

EMT Radiation
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The minimum value of spin multiplicity possible, when l=3, are 

(A) 2

(B) 1

(C) 0

(D) 3

Concept Questions :-

Quantum Numbers
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Positronium is an unstable complex of electron and positron, both of the same mass, but opposite charge. Apply Bohr's theory of hydrogen atom to this system and obtain the energy required to separate the electron from the positron.

(ionization energy of the ground state hydrogen atom= 13.62eV.) Express the result in KJmol-1

(A) 550 KJmol-1

(B) 657 KJmol-1

(C) 851 KJmol-1

(D) 720 KJmol-1

Concept Questions :-

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The total spin resulting from a d7 configuration is - 

(A) 3/2

(B) 1/2

(C) 2

(D) 1

Concept Questions :-

Quantum Numbers
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Supposing the energy of fourth shell for hydrogen atom is -50a.u. (Arbitrary unit). What would be its ionization potential-

(A) 50

(B) 800

(C) 15.4

(D) 20.8

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An element with atomic mass Z consists of two isotopes of mass number Z-1 and Z + 2. The percentage abundance of the heavier isotope is -

(A) 0.25

(B)33.3

(C)66.6

(D)75

Concept Questions :-

introduction
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Two isotopes of Boron are found in the nature with atomic weights 10.01(I) and 11.01(II). The atomic weight of natural Boron is 10.81. The percentage of (I) and (II) isotopes in it are respectively-

(A) 20 and 80

(B) 10 and 90

(C) 15 and 75

(D) 30 and 70

Concept Questions :-

introduction
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