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Atomic Structure MCQs for NEET — Chemistry Questions with Answers

Practice free Atomic Structure (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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Which of the expression given below gives IE of H atoms in terms of Rydberg’s constant $ (R_H)$ ?

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Explanation

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.

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

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If numerical value of mass and velocity are equal then de-Broglie wave length in terms of K.E. is

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If uncertainty in position and velocity are equal then uncertainty in momentum will be

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Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is

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Which of the following electronic transitions require that the greatest amount of energy be absorbed by a hydrogen atom?

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Explanation

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.

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How fast an electron is moving if it has a wavelength equal to the distance it travel in one second?

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If uncertainties in the measurement of position and momentum are equal, the uncertainty in the measurement of velocity is

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Energy equivalent of $ 10.00 cm^{–1} $ is

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The ratio of energy of the electron in ground state of hydrogen to the electron in first excited state of $ Be^{+3 } $ is

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Explanation

$ 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

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