Structure of atom practice · Mixed difficulty

Which of the following statement is/are correct about Hertz $(\mathrm{Hz})$?

Statement (S): Specific charge of $\alpha$-particles is twice to that of proton.

Explanation (E): Specific charge is given by $e / m.$

Cathode rays have same charge to mass ratio as

The ratio of wavelength values of series limit lines $(n_2 = \infty)$ of Balmer series and Paschen series are

The energy of an electron in first Bohr orbit of H-atom is -13.6 eV. The possible energy value of electron in the excited state of $\mathrm{L}{\mathrm{i}^{2 + }}$ is

Electromagnetic radiations of wavelength 240 $\mathrm{nm}$ are just sufficient to ionize sodium atom. The ionization energy of sodium (in $\mathrm{kJ} / \mathrm{mol}$ ) is

Which of the following particles has more electrons than neutrons

The H-spectrum show

What is the de Broglie wavelength? Assume that one mole of protons has a mass equal to $1 \mathrm{~g}?$ $(h=6.626 \times$ $10^{-27} \text{erg s})$

In case of $d_{x^2-y^2}$ orbital:

The electronic energy levels of the hydrogen atom in the Bohr^' s theory are called:

The principal quantum number of H-atom orbital, if the electron energy is -3.4 eV, will be

If the electron in hydrogen atom jumps from the third orbit to second orbit, the wavelength of the emitted radiation is given by

A typical golf ball weighs $40.0 \mathrm{~g}$. If it is moving with a velocity of $20.0 \mathrm{~ms}^{-1}$, its de-Broglie wavelength is

Which is not an atomic orbital?

The energy in joule corresponding to light of wavelength 45 nm is

Bond dissociation on energy of $\mathrm{Br}_2$ is $200 \mathrm{~kJ} / \mathrm{mole}$. The longest wavelength of photon that can break this bond would be $\left(N_{\mathrm{A}} \times h c=0.12 \mathrm{~J}\right)$

According to Heisenberg's uncertainty principle, the product of uncertainties in position and velocities for an electron of mass $9.1 \times 10^{-31} {~kg}$ is

A metallic ion ${M^{2 + }}$ ion has a electronic configuration of 2, 8, 14 and the ionic weight is 56 amu. The number of neutrons in its nucleus are

Energy required to stop the ejection of electrons from ${Cu}$ plate is $0.24\, \mathrm{eV}$. If radiation of $\lambda=253.7 \mathrm{~nm}$ strikes the plate, the work function is

Quantum numbers for some electrons are given below

A : $n=4, I=1\qquad$ B : $n=4, I=0\qquad$ C: $n=3, I=2\qquad$ D: $n=3, I=1$

The correct increasing order of energy of electrons

The radius of an orbit of H – atom is $4.77 \times {10^{ - 10}}m$. Then the angular momentum of an electron in this orbit is

Which among the following radiations has maximum frequency?

How many neutrons are present in tritium nucleus?

A photon of light of wavelength 6000 Å has energy $E$. What will be the wavelength of photon of a light which has energy of photon $4 E$ ?

ASSERTION (A) : Two electrons in an atom can have the same values of four quantum numbers.

REASON (R) : Two electrons in an atom can be present in the same shell, subshell and orbital and have the same spin.

The principal and azimuthal quantum number of electrons in $4 f$ orbitals are

Based on the equation $\Delta E=-2.0 \times 10^{-18} \mathrm{~J}\left(\frac{1}{n_2^2}-\frac{1}{n_1^2}\right)$
the wavelength of the light that must be absorbed to excite hydrogen electron from level $n=1$ to level $n=2$ will be $\left(h=6.625 \times 10^{-34} \mathrm{~J} \mathrm{~s}, c=3 \times 10^8 \mathrm{~m} \mathrm{~s}^{-1}\right)$

Which one of the following set of ions represents a collection of isoelectronic species

Statement-I: Emitted radiation will be $0.408 \times 10^{-19}$ joule when an electron jump from $n=4$ to $n=2$ in $\mathrm{H}$-atom.

Statement-II: Balmer series radiations belong to IR region for hydrogen atom only.