Question 1 :
Which of the following is electronic configuration of Cu2+ (Z = 29) ?
Question 2 :
The frequency of a wave is 6 × 10<sup>15</sup> s<sup>-1</sup>. Its wave number would be
Question 3 :
In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen
Question 4 :
For {tex} 2 s {/tex} orbital<br>{tex} \Psi _ { \mathrm { r } } = \frac { 1 } { \sqrt { 8 } } \left( \frac { z } { a _ { 0 } } \right) ^ { \frac { 3 } { 2 } } \left( 2 - \frac { z r } { a _ { 0 } } \right) e ^ { - \frac { z r } { 2 a _ { 0 } } } {/tex}<br>then, hydrogen radial node will be at the distance of
Question 5 :
____ Series of lines are the only lines in hydrogen spectrum which appear in the visible region.
Question 6 :
If the shortest wave length of Lyman series of H atom is x, then the wave length of the first line of Balmer series of H atom will be -
Question 7 :
A stream of electrons from a heated filaments was passed two charged plates kept at a potential difference {tex}\mathrm{V \,meV}{/tex}. If e and m are charge and mass of electron,respectively,then the value of {tex} h / \lambda {/tex} (where {tex} \lambda {/tex} is wavelength associated with electron wave) is given by:<br>
Question 9 :
Out of X -rays, infrared rays, visible rays and microwaves, the largest frequency is of
Question 10 :
How many orbitals and electrons are associated with n = 4?
Question 11 : Effective nuclear charge (<img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e78e3a2630b1e60d8656e17' height='21' width='33' >)for a nucleus of an atom is defined as.
Question 12 :
Which of the following is the energy of a possible excited state of hydrogen?
Question 13 :
The de-Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 m/s is approximately (planck's constant, h = 6.63 ´ 10-34 J-s)
Question 15 :
The momentum of a particle which has a de Broglie wavelength of {tex} 0.1 \mathrm { \ nm } {/tex} is {tex} \left( \mathrm { h } = 6.6 \times 10 ^ { - 34 } \mathrm { Js } \right) {/tex}
Question 17 :
Which of the following statements in relation to the hydrogen atom is correct ?
Question 18 :
The total number of electrons in a {tex} 4 \mathrm { d } {/tex} subshell are
Question 19 :
Which of the following properties of atom could be explained correctly by Thomson model of atom?
Question 20 :
Fill in the blanks with appropriate words.<br>The principal quantum number n determines the __(i)__<br>And __(ii)__ of an orbital. With the increase in value of n, the number of allowed __(iii)___ increases. Azimuthal quantum number defines the __(iv)__ of the orbital. The number of subshells in a principal shell is equal to the value __(v)__<br>(i) (ii) (iii) (iv) (v)
Question 22 :
If first ionization potential of a hypothetical atom is 16 V, then the first excitation potential will be :
Question 24 :
How many {tex} 3 \mathrm { d } {/tex} electrons can have spin quantum number {tex} - \frac { 1 } { 2 } ? {/tex}
Question 25 :
The total number of orbitals in a shell with principal quantum number {tex} n {/tex} is
Question 26 :
Which one is not in agreement with Bohr's model of atom?
Question 27 : What is the atomic number of the element which has <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e78e39f27ebf85f08ad4c5a' height='21' width='24' >as its outermost configuration?
Question 28 :
The ratio of the radii of first orbits of H, He<sup>+</sup> and Li<sup>2+</sup> is -
Question 29 :
Radius of 2nd shell of {tex}\mathrm{He}^{+}{/tex} (where {tex} \mathrm { a } _ { 0 } {/tex} - Bohr radius)
Question 30 :
With increasing principal quantum number, the energy difference between adjacent energy levels in atoms
Question 31 : Which of the following conclusions regarding the structure of atom is based on Rutherford's <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e78e374630b1e60d8656da9' height='15' width='15' >- particle scattering experiment?
Question 32 :
Which of the following radiations has the highest wave number ?
Question 33 :
The relative abundance of two isotopes of atomic weight 85 and 87 is 75% and 25% respectively. The average atomic weight of element is
Question 34 :
In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?<br>{tex} \begin{array} { l l } { \text { (A) } n = 1 , l = 0 , m = 0 } & { \text { (B) } n = 2 , l = 0 , m = 0 } \\ { \text { (C) } n = 2 , l = 1 , m = 1 } & { \text { (D) } n = 3 , l = 2 , m = 1 } \\ { \text { (E) } n = 3 , l = 2 , m = 0 } \end{array} {/tex}<br>
Question 35 :
The fourth line of the Balmer series corresponds to electron transition between which energy levels
Question 36 :
The third line of the balmer series in the emission spectrum of the hydrogen atom is due to the transition from the.
Question 37 :
Which of the following sets of quantum numbers is correct for an electron in 4f orbital?
Question 38 :
The ratio of energies of photons with wavelengths $2000A^{0}$ and $ 4000A^{0}$ is:<br/>
Question 40 :
The product of which of the following is equal to the velocity of light:
Question 41 :
Energy of an electron is given by {tex} \mathrm { E } = - 2.178 \times 10 ^ { - 18 } \mathrm { J } \left( \frac { Z ^ { 2 } } { n ^ { 2 } } \right) {/tex}<br>Wavelength of light required to excite an electron in an hydrogen atom from level {tex} n = 1 {/tex} to {tex} n = 2 {/tex} will be :<br>{tex} \left( \mathrm { h } = 6.62 \times 10 ^ { - 34 } \mathrm { J } \mathrm { s } \text { and } \mathrm { c } = 3.0 \times 10 ^ { 8 } \mathrm { ms } ^ { - 1 } \right) {/tex}
Question 42 :
The ionization enthalpy of hydrogen atom is {tex} 1.312 \times 10 ^ { 6 } \mathrm { J } {/tex} {tex} \mathrm { mol } ^ { - 1 } . {/tex} The energy required to excite the electron in the atom from {tex} \mathrm { n } = 1 {/tex} to {tex} \mathrm { n } = 2 {/tex} is
Question 43 :
The correct set of quantum numbers for the unpaired electron of chlorine atom is
Question 44 :
The element having no neutron in the nucleus of its atom is
Question 45 : Correct order of radius of the <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e7980dcd3f9ab617fcdb1d0' height='17' width='11' >st orbit of H, He+, Li2+, Be3+ is :
