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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM
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Understanding
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For the Balmer series in the spectrum of atom, the correct statements among (I) to (IV) are :
(I) As wavelength decreases, the lines in the series converge
(II) The integer is equal to
(III) The lines of longest wavelength corresponds to
(IV) The ionisation energy of hydrogen can be calculated from wave number of these lines
(I) As wavelength decreases, the lines in the series converge
(II) The integer is equal to
(III) The lines of longest wavelength corresponds to
(IV) The ionisation energy of hydrogen can be calculated from wave number of these lines
View answer and explanation
Correct option: D
I, II, III
Option D (I, II, III) is correct because statements I, II, and III accurately describe the Balmer series.
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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?