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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM
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Assertion (A): -orbital electron will be more tightly bound to the nucleus than -orbital electron.
Reason (R): experienced by the electron decreases with increase of azimuthal quantum number ().
Reason (R): experienced by the electron decreases with increase of azimuthal quantum number ().
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Correct option: B
Both Assertion and Reason are correct; Reason is not the correct explanation of Assertion
Option B is correct because both the assertion and the reason are correct, but the reason is not the correct explanation of the assertion. s-orbitals are more tightly bound, and Zeff decreases with increasing l, but the binding energy is more directly related to penetration.
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Assertion: Unlike sound waves, electromagnetic waves do not require medium and can move in vacuum.
Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?
Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?