Structure of atom practice · Mixed difficulty

The total number of nodes in a subshell are given by

The quantum number values for the designation $3 d$ are

A photon of 300 nm is absorbed by a gas which then
re-emits two photons. One re-emitted photon has
wavelength of 496 nm. Wavelength of other re-emitted
photon is

Which of the following is correctly matched?

For a d – electron, the orbital angular momentum is

An electron and a proton are accelerated through a potential $V$. If $P_{\mathrm{e}}$ and $P_{\mathrm{p}}$ are their momentum, then $P_{\mathrm{P}}: P_{\mathrm{e}}$ ratio is approximately equal to

S-II: Electrons may be considered as particles and waves.

S-II: An electron in an atom may be described as occupying at atomic orbital or by a wave function $\psi$, which is a solution to the schrodinger wave equation.

Which one is wrong statement?

Which of the following is not permissible arrangement of electrons in an atom

The ratio of speed of γ-rays and X-rays is:

Stark effect refers to the

Which of the following is never true for cathode rays?

Statement I: $\mathrm{Fe}^{3+}$ ion is more stable than $\mathrm{Fe}^{2+}$ ion in the gaseous state.
Statement II: $\mathrm{Fe}^{3+}$ ion has more number of unpaired electrons than $\mathrm{Fe}^{2+}$ ion.

Which of the following orbital have nodal plane in XY-plane?

If radius of second orbit of $\mathrm{He}^{+}$is $\mathrm{x} \mathrm{nm}$ then the radius of the first orbit of $\mathrm{Li}^{2+}$ will be

In hydrogen atomic spectrum, a series limit is found at 12186.3 $c{m^{ - 1}}$. Then, it belongs to

Which d-orbital does not have four lobes?

The most probable radius (in pm) for finding the electron inHe ${ }^{+}$is:

Which of the following has the highest value of specific charge?

The momentum of a photon is $p,$ the energy associated with photon is given by:

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason
R.
Assertion A: Energy of 2s orbital of hydrogen atom is greater than that of 2s orbital of lithium.
Reason R : Energies of the orbitals in the same subshell decrease with increase in the atomic number.
In the light of the above statements, choose the correct answer from the options given below.

A transition element X has configuration $\left[ {\mathrm{Ar}} \right]3{d^5}$ in its +3 oxidation state. Its atomic number is:

Two electrons occupying the same orbital are distinguished by:

An electron revolves round $\mathrm{Li}^{2+}$ nucleus at a distance of $1.587\,\mathop {\text{A}}\limits^ \circ$. The speed of electron should be

The minimum energy required to eject an electron from an atom is called :

Number waves in a Bohr orbit of H – atom is 3. Its potential energy would be

Select the correct statements from the following.

A. Atoms of all elements are composed of two fundamental particles.

B. The mass of the electron is $9.10939 \times 10^{-31} \mathrm{~kg}$.

C. All the isotopes of a given element show same chemical properties.

D. Protons and electrons are collectively known as nucleons.

E. Dalton's atomic theory, regarded the atom as an ultimate particles of matter.

Choose the correct answer from the options given below.

The de Broglie wavelength associated with a ball of mass $200 {~g}$ and moving at a speed of $5 {~m} / {h}$, is of the order of $\left({h}=6.625 \times 10^{-34} {Js}\right.$ )

The radii of an atom and atomic nucleus is of the order of

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is $\frac{{16}}{{15R}}\mathrm{cm}$. What is the value of ${n_2}$?(R=Rydberg constant)