Atomic Structure · Chemistry · TS EAMCET
MCQ (Single Correct Answer)
1
If $n, l$ represent the principal and azimuthal quantum numbers respectively, the formula used to know the number of radial nodes possible for a given orbital is
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2
If the radius of first orbit of hydrogen like ion is $1.763 \times 10^{-2} \mathrm{~nm}$, the energy associated with that orbit (in J ) is
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3
The wavelength of an electron is $10^{3} \mathrm{~nm}$. What is its momentum in $\mathrm{kg} \mathrm{ms}^{-1}$ ? ( $\left.h=6.625 \times 10^{-34} \mathrm{Js}\right)$
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4
Two statements are given below :
Statement I : In H atom, the energy of $2 s$ and $2 p$ orbitals is same.
Statements II : In He atom, the energy of $2 s$ and $2 p$ orbitals is same.
The correct answer is
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5
The wavenumber of first spectral line of Lyman series of $\mathrm{He}^{+}$ion is $x \mathrm{~m}^{-1}$. What is the wave number ( $\mathrm{in}^{-1}$ ) of second spectral line of Balmer series of $\mathrm{Li}^{2+}$ ion?
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6
The uncertainty in determination of position of a small ball of mass 10 g is $10^{-33} \mathrm{~m}$. With what $\%$ of accuracy its speed can be measured, if it has a speed of 52.5 $\mathrm{ms}^{-1} ?\left(h=6.6 \times 10^{-34} \mathrm{Js}\right)$
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7
The kinetic energy of electrons emitted, when radiation of frequency $1.0 \times 10^{15} \mathrm{~Hz}$ hits a metal, is $2 \times 10^{-19} \mathrm{~J}$. What is the threshold frequency of the metal (in Hz )? $\left(h=6.6 \times 10^{-34} \mathrm{Js}\right)$
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8
Identify the pair of species having same energy from the following. (The number given in the bracket corresponds to principal quantum number ( $n$ ) in which the electron is present.)
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9
Which one of the following corresponds to the wavelength of line spectrum of H atom in its Balmer series ? ( $R=$ Rydberg constant)
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10
The wavelength of second line of Balmer series of hydrogen atom is $\lambda \mathrm{nm}$. What is the wavelength of first line of Lyman series of $\mathrm{He}^{+}$ion (in nm )?
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11
Consider the following.
I. The electron spin quantum number describes the orientation of the spin of the nucleus with respect to the magnetic field.
II. The orbitals represented by the quantum numbers $n=3, l=2, m=+2$ and $n=3, l=2, m=-2$ have the same energy.
III. The energy of a photon is directly proportional to wavelength but inversely proportional to wave number.
IV. Lyman series of lines appear in ultra-violet region.
The correct statements are
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12
The radius of third orbit of hydrogen atom is $R \mathrm{pm}$. The radius of second orbit of $\mathrm{He}^{+}$ion (in pm is)
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13
The threshold frequency of a metal is $10^{15} \mathrm{~s}^{-1}$. The ratio of maximum kinetic energies of the photoelectrons, when the metal is made to strike with radiations of frequencies $1.5 \times 10^{15} \mathrm{~s}^{-1}$ and $2.0 \times 10^{15} \mathrm{~s}^{-1}$ respectively is
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