Atomic Structure PYQs - Last 10 Years

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Practice 59 AP EAPCET Chemistry questions from Atomic Structure. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Atomic Structure Questions

Showing 50 of 59 filtered questions.

1Atomic Structure

The energy of second Bohr orbit of hydrogen atom is -3.4 eV . The energy of the fourth Bohr orbit of the $\mathrm{He}^{+}$ ion will be

2Atomic Structure

The wavelength of a particular electron transition for $\mathrm{He}^{+}$is 100 nm . The wavelength (in $\AA$ ) of H atom for the same transition is

3Atomic Structure

In an element with atomic number $(Z) 25$, the number of electrons with $(n+l)$ value equal to 3 and 4 are $x$ and $y$ respectively. The value of $(x+y)$ is

4Atomic Structure

The work function of Cu is $7.68 \times 10^{-19} \mathrm{~J}$. If photons of wavelength 221 nm are made to strike the surface of the metal, the kinetic energy (in J) of the ejected electrons will be ( $h=6.63 \times 10^{-34} \mathrm{Js}$ )

5Atomic Structure

The number of electrons with magnetic quantum number, $m_l=0$ in the elements with atomic numbers $Z=24$ and $Z=29$ are respectively.

6Atomic Structure

$a, b, c, d$ are electromagnetic radiations. Frequencies of $a, b$ are $3 \times 10^{15} \mathrm{~Hz}, 2 \times 10^{14} \mathrm{~Hz}$, respectively, whereas wavelength of $c, d$ are $400 \mathrm{~nm}, 750 \mathrm{~nm}$, respectively. The in...

7Atomic Structure

Which of the following represents the wavelength of spectral line of Balmer series of $\mathrm{He}^{+}$ion?
$(R=$ Rydberg constant, $n>2)$

8Atomic Structure

The work functions (in eV ) of $\mathrm{Mg}, \mathrm{Cu}, \mathrm{Ag}, \mathrm{Na}$ respectively are $3.7,4.8,4.3,2.3$. From how many metals, the electrons will be ejected if their surfaces are irradiated with an electromagnetic radiation o...

9Atomic Structure

The radius of fourth orbit in $\mathrm{He}^{+}$ion is ' $R_1{ }^{\prime} \mathrm{pm}$ and radius of third orbit in $\mathrm{Li}^{2+}$ ion is ' $R_2{ }^{\prime} \mathrm{pm}$. The value of ( $R_1-R_2$ ) in pm is

10Atomic Structure

The de-Broglie wavelengths of two fast moving particles $X, Y$ are $1 \mathrm{~nm}, 3 \mathrm{~nm}$ respectively. Mass of $X$ is nine times the mass of $Y$. The ratio of kinetic energies of $X, Y$ is

11Atomic Structure

The total maximum number of electrons possible in $3 d$. $6 d, 5 s$ and $4 f$ orbitals with $m_l$ (magnetic quantum number) value -2 is

12Atomic Structure

The uncertainty in the velocities of two particles $A$ and $B$ are 0.03 and $0.01 \mathrm{~ms}^{-1}$ respectively. The mass of $B$ is four times to the mass of $A$. The ratio of uncertainties in their positions is

13Atomic Structure

Which of the following sets of quantum numbers is not possible for the electron?

14Atomic Structure

The wavenumber of the first line $\left(n_2=3\right)$ in the Balmer series of hydrogen is overline $\bar{v}_1 \mathrm{~cm}^{-1}$. What is the wavenumber (in $\mathrm{cm}^{-1}$ ) of the second line ( $n_2=4$ ) in the Balmer series of $\mathr...

15Atomic Structure

The de-Broglie wavelength of an electron in the third Bohr orbit of H -atom is

16Atomic Structure

The difference between the radii of 3rd and 2nd orbit of H -atom is $x \mathrm{pm}$. The difference between the radii of 4th and 3rd orbit of $\mathrm{Li}^{2+}$ ion is $y$ pm. $y: x$ is equal to

17Atomic Structure

The uncertainty in the position of electron $(\Delta x)$ is approximately 100 pm . The uncertainty in momentum (in $\mathrm{kg} \mathrm{ms}^{-1}$ ) of an electron $\left[h=6.626 \times 10^{-34} \mathrm{Js}\right]$

18Atomic Structure

Which of the following statements are correct?
I. The energy of hydrogen atom in its ground state is -13.6 eV .
II. On the basis of Bohr's model, the radius of the 3rd orbit of hydrogen atom is 158.7 pm .
III. The order of radius of the fir...

19Atomic Structure

When a metal surface is irradiated with light of frequency $x \mathrm{~Hz}$, the kinetic energy of emitted photoelectrons is $z \mathrm{~J}$. When the same metal is irradiated with light of frequency $y \mathrm{~Hz}$, the kinetic energy of ...

20Atomic Structure

Identify the correct statements from the following
I. Isotopes of an element show different chemical behaviour.
II. Lyman series of lines of hydrogen spectrum appear in UV region.
III. The oscillating electric and magnetic field components ...

21Atomic Structure

If the position of the electron was measured with an accuracy of +0.002 nm . The uncertainty in the momentum of it would be (in $\mathrm{kg} \mathrm{ms}^{-1}$ )
\(\left(h=6.626 \times 10^{-34} \mathrm{Js}\right)\)

22Atomic Structure

The sum of number of angular nodes and radial nodes for $4 d$-orbital is

23Atomic Structure

If $v_0$ is the threshold frequency of a metal $X$, the correct relation between de-Broglie wavelength $(\lambda)$ associated with photoelectron and frequency $(v)$ of the incident radiation is

24Atomic Structure

If the longest wavelength of spectral line of Paschen series of $\mathrm{Li}^{2+}$ ion spectrum is $x \mathop {\rm{A}}\limits^{\rm{o}}$. Then the longest wavelength (in $\mathop {\rm{A}}\limits^{\rm{o}}$ ) of Lyman series of hydrogen spectr...

25Atomic Structure

The ratio of ground state energy of $\mathrm{Li}^{2+}, \mathrm{He}^{+}, \mathrm{H}$ is

26Atomic Structure

The de-Broglie wavelength of an electron with kinetic energy of 2.5 eV is (in m$)\left(1 \mathrm{eV}=1.6 \times 10^{-19} \mathrm{~J}\right.$, $m_e=9 \times 10^{-31} \mathrm{~kg}$ )

27Atomic Structure

The energy of third orbit of $\mathrm{Li}^{2+}$ ion (in J ) is

28Atomic Structure

The number of $d$ electrons in Fe is equal to which of the following?
(i) Total number of ' $s$ ' electrons of Mg .
(ii) Total number of ' $p$ ' electrons of Cl .
(iii) Total number of ' $p$ ' electrons of Ne .
The correct option is

29Atomic Structure

The difference in radii between fourth and third Bohr orbit of $\mathrm{He}^{+}($in m$)$ is

30Atomic Structure

If $\lambda_0$ and $\lambda$ are respectively the threshold wavelength and wavelength of incident light the velocity of photo electrons ejected from the metal surface is

31Atomic Structure

Identify the pair of elements in which number of electrons in ( $n-1$ ) shell is same

32Atomic Structure

The angular momentum of an electron in a stationary state of $\mathrm{Li}^{2+}(Z=3)$ is $3 h / \pi$. The radius and energy of that stationary state are respectively

33Atomic Structure

The graph between variation of probability density. $\psi^2(r)$ and distance of the electron from the nucleus, $r$ is shown below. This represents

34Atomic Structure

If uncertainty in position and momentum of an electron are equal, then uncertainty in its velocity is

35Atomic Structure

A golf ball of mass $m \mathrm{~g}$ has a speed of $50 \mathrm{~ms}^{-1}$. If the speed can be measured within accuracy of $2 \%$ the uncertainty in the position is (in m)

36Atomic Structure

In the ground state of hydrogen atom, electron absorbs 1.5 times energy than the minimum energy $\left(2.18 \times 10^{-18} \mathrm{~J}\right)$ to escape from the atom. The wavelength of the emitted electron (in $m$ ) is ( $m_e=9 \times 10^...

37Atomic Structure

Correct set of four quantum numbers for the valence electron of strontium $(z=38)$ is

38Atomic Structure

The de-Broglie wavelength of a particle of mass 1 mg moving with a velocity of $10 \mathrm{~ms}^{-1}$ is $\left(\mathrm{h}=6.63 \times 10^{-34} \mathrm{Js}\right.$ )

39Atomic Structure

Vijaywada FM radio station broadcasts at frequency of 103.4 MHz . The wavelength of the corresponding radio wave (in m ) is

40Atomic Structure

The minimum number of quantum numbers required to specify an orbital in an atom is

41Atomic Structure

Which of the following electron arrangement does not obey Hund's rule?

42Atomic Structure

The de Broglie wavelength of an electron travelling with $20 \%$ of velocity of light is
\(\left(h=6.626 \times 10^{-34} \mathrm{Js} ; m_e=9.1 \times 10^{-31} \mathrm{~kg}\right)\)

43Atomic Structure

The energy required (in eV) to excite an electron of H -atom from the ground state to the third state is

44Atomic Structure

The wavelength associated with the electron moving in the first orbit of hydrogen atom with velocity \(2.2 \times 10^6 \mathrm{~ms}^{-1}\) (in nm) is
\(\left(m_e=9.0 \times 10^{-31} \mathrm{~kg}, h=6.6 \times 10^{-34} \mathrm{Js}\right)\)

45Atomic Structure

If \(\Delta x\) is the uncertainty in position and \(\Delta v\) is the uncertainty in velocity of a particle are equal, the correct expression for uncertainty in momentum for the same particle is

46Atomic Structure

The number of radial nodes and angular nodes of a \(4 f\)-orbital are respectively

47Atomic Structure

Which quantum number provides information about the shape of an orbital?

48Atomic Structure

The maximum number of electrons present in an orbital with \(n = 4, l = 3\) is

49Atomic Structure

Match the following species with the correct number of electrons present in them.

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50Atomic Structure

The masses of an electron, a proton and a neutron respectively will be n the ratio