Four lowest energy levels of H-atom are shown in the figure. The number of possible emission lines would be

(a) 3             (b) 4
(c) 5             (d) 6

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The order of the size of nucleus and Bohr radius of an atom respectively are
(a)                (b)
(c)                (d)

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The ratio of the wavelengths for 2 $\to$ 1 transition in ${\mathrm{Li}}^{++}$${\mathrm{He}}^{+}$ and H is
(a) 1 : 2 : 3            (b) 1 : 4 : 9
(c) 4 : 9 : 36           (d) 3 : 2 : 1

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is
(a)          (b)
(c)           (d)

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Energy of the electron in nth orbit of hydrogen atom is given by ${\mathrm{E}}_{\mathrm{n}}=-\frac{13.6}{{\mathrm{n}}^{2}}\mathrm{eV}$. The amount of energy needed to transfer electron from first orbit to third orbit is

(a) 13.6 eV             (b) 3.4 eV
(c) 12.09 eV            (d) 1.51 eV

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The de-Broglie wavelength of an electron in the first Bohr orbit is
(a) Equal to one fourth the circumference of the first orbit
(b) Equal to half the circumference of the first orbit
(c) Equal to twice the circumference of the first orbit
(d) Equal to the circumference of the first orbit

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The frequency of 1st line of Balmer series in ${\mathrm{H}}_{2}$ atom is ${\mathrm{v}}_{0}$. The frequency of line emitted by singly ionised He atom is

(a) 2${\mathrm{v}}_{0}$           (b) 4${\mathrm{v}}_{0}$
(c) ${\mathrm{v}}_{0}$/2          (d) ${\mathrm{v}}_{0}$/4

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

When the electron in the hydrogen atom jumps from 2nd orbit to 1st orbit, the wavelength of radiation emitted is $\mathrm{\lambda }$. When the electrons jump from 3rd orbit to 1st orbit, the wavelength of emitted radiation would be
(a) $\frac{27}{32}\mathrm{\lambda }$             (b) $\frac{32}{27}\mathrm{\lambda }$
(c) $\frac{2}{3}\mathrm{\lambda }$               (d) $\frac{3}{2}\mathrm{\lambda }$

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which of the following transition will have shortest emission wavelength ?
(a) n = 2 to n =1           (b) n = 1 to n = 2
(c) n = 2 to n = 5          (d) n = 5 to n = 2

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of ${\mathrm{Li}}^{++}$ is
(a) 122.4 eV        (b) 30.6 eV
(c) 13.6 eV          (d) 3.4 eV

Concept Questions :-

Bohr's model of atom