AIIMS Chemistry Structure of Atom Class 11 Questions

If energy of electron in ground state is −13.6 then find out speed of electron in fourth orbit of H⁻atom

If energy of 15 eV is given to electron in $4^{th}$ orbit then find it's final energy when it comes out of H⁻atom.

An electron is revolving in n = 3 orbit. What will be the magnetic field at the centre of hydrogen atom?

An electron collides elastically with H⁻like atom and excites it from ground state to n = 3. Find out the energy transfer to H⁻like atom

At which excited state of $\text{Be}^{3+}$ radius of $\text{e}^-$ will be same as $\text{H}$ atoms and electron in ground state.

Assertion: For revolving electron, direction of angular momentum and magnetic moment are opposite.

Reason: Charge of electron is negative.

Energy of electron (in eV) in $2^{\text{nd}}$ orbit of $\text{He}^+$ ion?

Assertion: For an element generally N ≥ Z (N=number of neutrons, Z= atomic number) Reason: Neutrons always experience attractive nuclear force.

Assertion: Hydrogen atom consists of only one electron but its emission spectrum has many lines. Reason: Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

Assertion : Hydrogen atom consists of only one electron but its emission spectrum has many lines.

Reason : Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

How many spectral line of Balmer series present in visible region :

If n = 2 for $\text{He}^+$ ion than find out the wave length

Which alkali metal during flame test will show colour corresponding to maximum wavelength?

Which one of the following set of quantum numbers is not possible for $4p$ electron?

Radius of $1^{\text{st}}$ orbit of $\text{H}$ and some orbit of $\text{Be}^{3+}$ is same. Energy of their orbit of $\text{Be}^{3+}$ is :

Assertion : The chemical properties of different isotope are same.

Reason : Isotopes having same number of neutron.

Which of the following elements outermost orbit's last electron has magnetic quantum number $m=0$?

Assertion : In absorption spectrum, $n_f > n_i$, while in emission spectrum, $n_f > n_i$

Reason : Energy is limited in absorption spectrum, that is, electron moves from lower to higher orbit and energy is absorbed in emission spectrum, because election jumps from higher to lower orbit.

Assertion: Balmer series contains four important lines called Hₐ, Hᵦ, Hᵧ and Hₛ lines (wavelength 6563 Å, 4862 Å, 4341 Å, 4102 Å respectively).

Reason: This is due to the jump from n₂ = 3,4,5,6 respectively to n₁ = 2.

Find out the velocity of electron in second orbit of helium.

In a hydrogen spectrum, the third line of the Balmer series has a wavelength $\lambda$. Find the binding energy of the ground state.

What is the shortest wavelength present in the Paschen series of spectral lines?

The Bohr radii of a hydrogen like atom are r₁ and r₂. Find the wavelength of photon when electron jumps from r₂ to r₁.

If radiation corresponding to first line of “Balmer series” of $\text{He}^+$ ion knocked out electron from $1^{\text{st}}$ excited state of $\text{H}$ atom, the kinetic energy of ejected electron from $\text{H}$ atom would be ($\text{eV}$)

$\left[\text{Given } E_n = \frac{Z^2}{n^2}(13.6\text{ eV})\right]$

The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 Å. The wavelength of the second spectral line in the Balmer series of singly-ionized helium atom is

Assertion: Electrons in the atom are held due to coulomb forces.

Reason: The atom is stable only because the centripetal force due to Coulomb’s law is balanced by the centrifugal force.

Assertion : The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.

Reason : Rutherford did α-particle scattering experiment.

A gas metal in bivalent state have approximately $23\text{e}^-$ what is spin magnetic moment in elemental state

What is maximum wavelength of line of Balmer series of Hydrogen spectrum $\left(R = 1.09 \times 10^7\text{ m}^{-1}\right)$ :

What is the energy ($\text{kJ/mol}$) associated with the de-excitation of an electron from $n = 6$ to $n = 2$ in $\text{He}^+$ ion?

In the following questions, a statement of assertion is given followed by a corresponding statement of reason.

Assertion:(A) Hydrogen atom consists of only one electron but its emission spectrum has many lines.

Reason:Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

Assertion: The positive charged nucleus of an atom has a radius of 10⁻¹⁵ m. Reason: In α-particle scattering experiment, the distance of closest approach for α particle is 10⁻¹⁵ m.

Assertion: The positively charged nucleus of an atom has a radius of almost 10⁻¹⁵ m. Reason: In α particle scattering experimenting, the distance of closest approach for α-particles is ≈ 10⁻¹⁵ m.

Which transition in the hydrogen atomic spectrum will have the same wavelength as the Balmer transition ( i.e. n=4 to n=2 ) of $\text{He}^{+}$ spectrum

Assertion : Electrons in the atom are held due to coulomb forces. Reason : The atom is stable only because the centripetal force due to Coulomb’s law is balanced by the centrifugal force.

According to Bohr’s theory, which of the following correctly represents the variation of energy and radius of an electron in nth orbit of H⁻atom?

Assertion: For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of Z. Reason: Electronegativity decreases across a period.

Assertion (A) The magnetic moment (μₗ) of an electron revolving around the nucleus decreases with increasing principle quantum number (n).

Reason (R) Magnetic moment of the revolving electron, μ ∝ n.

One mole of magnesium in the vapour state absorbed 1200 kJ mol⁻¹ energy. If the first and second ionisation energies of Mg are 750 and 1450 kJ mol⁻¹ respectively, the final composition of the mixture is

The degeneracy of hydrogen atom that has energy equal to -Rₕ/9 (where Rₕ = Rydberg constant)

The stability of ferric ion is due to

If the IP of Na is 5.48 eV, the ionisation potential of K will be

Maximum number of unpaired electrons are present in

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 × 10⁻⁴, then particle is

Assertion: Number of radial and angular nodes for 3p-orbital are 1, respectively. Reason: Number of radial and angular nodes depends only on principal quantum number.

Threshold frequency of a metal is 5 × 10¹³ s⁻¹ upon which 1 × 10¹⁴ s⁻¹ frequency light is focused. Then the maximum kinetic energy of emitted electron is

In Bohr’s orbit, $\frac{nh}{2\pi}$ indicates

Assertion : Bohr model fails in case of multi-electron species. Reason : It does not mention electron-electron interactions.

Assertion: The spectrum of $\text{He}^+$ is expected to be similar to that of hydrogen. Reason: $\text{He}^+$ is also one electron system.

Smallest wavelength occurs for