NEET Chemistry Questions: Structure of Atom

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In one joule of energy, the number of photon with wave number equal to is




$ E = h \nu = nh { c \over \lambda } = nhc \bar v \therefore now E = 1 , \bar v = x \therefore n = { 1 \over hcx } = ( hcx)^{-1} $
Which of the expression given below gives IE of H atoms in terms of Rydberg’s constant $ (R_H)$ ?




The expression $R_H hc$ gives the ionization energy (IE) of the hydrogen atom in terms of the Rydberg constant ($R_H$), Planck's constant ($h$), and the speed of light ($c$). This expression is derived from the Rydberg formula and represents the energy required to remove an electron from the ground state of the hydrogen atom.

One unpaired electron causes magnetic moment of 1.1 B.M. The magnetic moment of $ Fe^{+2} $ ion is





No explanation available.
If numerical value of mass and velocity are equal then de-Broglie wave length in terms of K.E. is




No explanation available.
If uncertainty in position and velocity are equal then uncertainty in momentum will be




No explanation available.
Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is




No explanation available.
Which of the following electronic transitions require that the greatest amount of energy be absorbed by a hydrogen atom?




In the hydrogen atom, the energy required for electronic transitions increases as the difference between the initial and final principal quantum numbers increases. The transition from n=1 to n=2 corresponds to the largest energy gap (Lyman series) and therefore requires the greatest amount of energy to be absorbed by the hydrogen atom.
How fast an electron is moving if it has a wavelength equal to the distance it travel in one second?




No explanation available.
If uncertainties in the measurement of position and momentum are equal, the uncertainty in the measurement of velocity is




No explanation available.
Energy equivalent of $ 10.00 cm^{–1} $ is




No explanation available.
The ratio of energy of the electron in ground state of hydrogen to the electron in first excited state of $ Be^{+3 } $ is




$ E_n = { -13.6 Z^2 \over n ^2 } eV atom ^ {-1} $ For hydrogen atom in ground state Z=1 and n=1 for $ Be^{+3} $ ion in first excited state Z= 4 and n= 2
The electrons present in K-shell of the atom will differ in




No explanation available.
The maximum number of electrons in a subshell for which l = 3 is (Andhra B. Tech 1982)




No explanation available.
Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the




When sodium chloride is introduced into a Bunsen flame, the heat energy is absorbed by the sodium atoms, promoting their electrons to higher energy levels. As the excited electrons return to their ground state, they emit excess energy as radiation in the visible region, specifically a yellow color.
The exact path of electron 2p-orbital cannot be determined.” The above statement is based upon




The statement that the exact path of an electron in a 2p orbital cannot be determined is based on the Heisenberg Uncertainty Principle. This principle states that it is impossible to simultaneously determine the exact position and momentum (or velocity) of a particle with absolute precision.