AIIMS Chemistry Structure Of Atom Class 11 Questions

Which has least covalent radius.

For balmer series, n¹ = 2 and n² = 3, 4, 5, 6,.........

As n=2 and Z=2 for He⁺ ion, so the wave length is calculated below.

The colors of the flame of the given metals are

For 4p electron, \( n = 4, l = 1, m = -1, 0, +1 \) and \( s = +1/2 \) or \( -1/2 \)

The radius of nᵗʰ orbit is, rₙ ∝ n²/Z (r₁)ₕ = (rₙ)Be³⁻ 1²/1 = n²/4 n = 2 The energy of their orbit is,

The chemical properties of different isotope are same but in isotopes the number of neutrons is different. So, the assertion is true but the reason is false.

m equals to zero corresponds to the s electron, which is the last electron of the element should be an s electron.

At 298 K temperature, A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH 10= and by passing hydrogen gas around the platinum were at one atm pressure. The potential of the electrode would be?

While moving from one orbit to another, an electron either radiates or absorbs energy. It radiate energy while moving from higher to lower orbit, and it absorb energy while moving away from lower to higher orbital.

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.

A metal having +2 oxidation state has approximately 23e⁻. M²⁺ → 23e⁻ Therefore, M → 25 e⁻ Electronic configuration of M is equal to 3d⁵ 4s² The spin magnetic moment is calculated as: \( \mu = \sqrt{n(n+2)} \)

In Balmer series, the transition is from 3 → 2. Therefore, wavelength can be calculated as: \( \frac{1}{\lambda} = R_H Z^2 \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right) \) \( \frac{1}{\lambda} = 1.09 \times 10^7 \times 1^2 \left( \frac{1}{2^2} - \frac{1}{3^2} \right) \) Simplify the above equation; \( \lambda = 654 \text{ nₘ} \)

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

Calculate the change in energy ΔE using the given formula.

The degeneracy of hydrogen atom that has energy equal to -\(\frac{R}{9}\) is (where R = Rydberg constant)

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.

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)

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

Which of the following is wrong for Bohr model?

In the ground state of Cu²⁺, the number of shells occupied, subshells occupied, filled orbitals and unpaired electrons respectively are

Assertion: The quantized energy of an electron is largely determined by its principal quantum number. Reason: The principal quantum number n is a measure of the most probable distance of finding the electron around the nucleus.

The de Broglie wavelength associated with a ball of mass 1 kg having kinetic energy 0.5 J is

α-Particles can be detected using

The most probable radius (in pm) for finding the electron in He⁺ is

For principle quantum number n = 4, the total number of orbitals having l = 3 is

The quantum number m of a free gaseous atom is associated with

Quantum numbers of an atom can be defined on the basis of

Which of the following has maximum energy?

Spectrum of Li²⁺ is similar to that of

Azimuthal quantum number defines

Which of the following does not have valence electron in 3d-subshell?

Assertion : For Balmer series of hydrogen spectrum, the value n₁ = 2 and n₂ = 3, 4, 5. Reason : The value of n for a line in Balmer series of hydrogen spectrum having the highest wave length is 4 and 6.

Assertion : Absorption spectrum consists of some bright lines separated by dark spaces. Reason : Emission spectrum consists of dark lines.

Which of the following arrangement is possible? n l m s

The electronic configuration 1s² 2s² 2p⁵ 3s¹ shows