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Chemistry · Structure of atom
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Chemistry · Structure of atom
In R.A. Millikan's oil drop experiment, the magnitude of electrical charge \( q \) on the droplets is always an integral multiple of the electrical charge \( e \), represented as \( q = n e \). What are the possible values of \( n \)?
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Calculate the total number of exchange energy combinations possible for a half-filled \( d^5 \) electronic configuration.
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How many radial nodes are present in a \( 2s \)-orbital?
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A microscope using suitable photons is employed to locate an electron within a distance of \( 0.1 \text{ \AA} \). What is the uncertainty involved in the measurement of its velocity?
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Given below are two statements: Statement I: The line emission spectra of atomic hydrogen can be used in chemical analysis to identify unknown atoms in the same way as fingerprints are used to identify people. Statement II: Each element has a unique line emission spectrum. In the light of the above statements, choose the most appropriate answer from the options given below:
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Given below are two statements:\n Statement I: The number of radial nodes in an orbital is given by the expression \( n - l - 1 \).\n Statement II: The number of angular nodes for any orbital is equal to the azimuthal quantum number \( l \). \nIn the light of the above statements, choose the most appropriate answer from the options given below:
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According to Pauli's exclusion principle, what is the maximum number of electrons in an atom that can share the same values for quantum numbers \( n \), \( l \), and \( m_l \)?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Bohr's model is unable to explain the splitting of spectral lines in the presence of a magnetic field (Zeeman effect). Reason (R): Bohr's theory assumes electrons move in well-defined circular orbits of fixed radius and energy. In the light of the above statements, choose the correct answer from the options given below:
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The total number of nucleons in an atom is defined as the sum of:
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In a vacuum, all types of electromagnetic radiations travel at the same speed, \( c \), which is equal to:
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In Rutherford's \( \alpha \)-particle scattering experiment, what fraction of \( \alpha \)-particles were observed to bounce back, i.e., get deflected by nearly \( 180^\circ \)?
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Given below are two statements: Statement I: The frequency of radiation emitted when transition occurs between two stationary states is given by Bohr's frequency rule: \( \nu = \frac{\Delta E}{h} \). Statement II: The energy change takes place in a continuous manner when an electron moves from one stationary state to another. In the light of the above statements, choose the most appropriate answer from the options given below:
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What is the radius of the first stationary state (Bohr orbit, \( a_0 \)) for a hydrogen atom?
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What is the speed of electromagnetic radiation in vacuum according to Maxwell's theory and experimental measurements?
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Given below are two statements: Statement I: The value \( 109,677 \text{ cm}^{-1} \) is called the Rydberg constant for hydrogen. Statement II: The first five series of lines in the hydrogen spectrum known as Lyman, Balmer, Paschen, Bracket and Pfund correspond to \( n_1 = 1, 2, 3, 4, 5 \) respectively. In the light of the above statements, choose the most appropriate answer from the options given below:
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): In multi-electron atoms, orbitals within the same shell have different energies.\n Reason (R): Shielding of outer electrons by inner shell electrons leads to different effective nuclear charges experienced by different subshells. \nIn the light of the above statements, choose the correct answer from the options given below:
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What is the total number of orbitals associated with the principal quantum number \( n = 3 \)?
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A species has 18 electrons, 16 protons, and 16 neutrons. Assign the correct chemical symbol to this species.
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Given below are two statements:\n Statement I: The electron spin quantum number (\( m_s \)) was introduced to explain the splitting of spectral lines in magnetic fields and doublet/triplet structures.\n Statement II: Spin angular momentum of an electron is a vector quantity that can have two orientations relative to a chosen axis, designated as \( +\frac{1}{2} \) and \( -\frac{1}{2} \). \nIn the light of the above statements, choose the most appropriate answer from the options given below:
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Calculate the wavenumber (\( \bar{\nu} \)) of yellow light emitted from a sodium lamp having a wavelength \( (\lambda) \) of \( 580 \text{ nm} \).
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Which of the following points constitute the major limitations of Bohr's model of the atom? (A) It fails to account for the finer details of the hydrogen atom spectrum observed by sophisticated spectroscopic techniques. (B) It is unable to explain the spectrum of atoms other than hydrogen, such as helium. (C) It cannot explain the splitting of spectral lines in a magnetic field (Zeeman effect). (D) It correctly explains the ability of atoms to form molecules by chemical bonds. Choose the correct answer from the options given below:
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Which of the following describes Thomson's model of an atom correctly?
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