Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is
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Chemistry MCQs for NEET — Practice Questions with Answers
Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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.
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
The electrons present in K-shell of the atom will differ in
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The maximum number of electrons in a subshell for which l = 3 is (Andhra B. Tech 1982)
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Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
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Explanation
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
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Explanation
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.
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