Structure of atom practice · Medium

Which of the following statements concerning the quantum numbers are correct?

(i) Angular quantum number determines the threedimensional shape of the orbital.

(ii) The principal quantum number determines the orientation and energy of the orbital.

(iii) Magnetic quantum number determines the size of the orbital.

(iv) Spin quantum number of an electron determines the orientation of the spin of electron relative to the chosen axis.

The correct set of option is

For which of the following, the radius will be same as for hydrogen atom having n=1?

An electron that has quantum number n=3 and m=2:

Bohr radius for the hydrogen atom (n = 1) is approximately $0.53\,\,\mathop \mathrm{A}\limits^\mathrm{o} .$ The radius for the first excited state ( n = 2) orbit is (in $\mathop \mathrm{A}\limits^\mathrm{o} )$

In the Bohr’s orbit, what is the ratio of kinetic energy and total energy of the electron ?

Number of nodal planes in 4P – subshell will be

The first line in the Balmer series in the $\mathrm{H}$-atom will have the frequency

There are three elements A, B, C having outermost electronic configuration $3 s^2, 3 p^4, 3 p^5$ respectively. Which statement is incorrect for three elements:

Consider the following statements:

I. The energy of electrons in atoms is quantised.

II. The existence of quantised electronic energy levels is a direct result of the wave like properties of electrons.

III. The path of an electron in an atom can never be determined accurately.

The correct statements are

The quantum numbers of most energetic electron in Ne atom when it is in first excited state is:

The frequency of revolution of electron II excited state $\text{He}^+$ and I excited state of $\text{H}$-atom:

Assertion (A): The number of radial nodes in 3s and 4p orbitals is not equal.

Reason (R): The number of radial nodes in any orbital depends upon the values of $n$ and $l$ which are different for 3s and 4p
orbitals.

Assertion :- In hydrogen energy of 4s is more than 3d.

Reason :- An orbital with lower value of $(n+\ell)$ has smaller energy than the orbital with higher value of $(n+\ell).$

The number of wave made by an electron moving in an orbit having maximum magnetic quantum number +3 is :

Photodissociation of water ${H}_2 {O}({l})+h v \rightarrow {H}_2({~g})$ $+1 / 2 {O}_2({~g})$ has been suggested as a source of hydrogen. The heat absorbed in this reaction is $289.5 \mathrm{~kJ} / \mathrm{mole}$ of water decomposed. The maximum wavelength that would provide the necessary energy assuming that one photon causes the dissociation of one water molecule is ( $1 \mathrm{eV}=96.5 \mathrm{~kJ} / \mathrm{mol}$ )

What is the correct orbital designation for the electron with the quantum numbers, $n = 4,l = 3,m = - 2,s = 1/2?$

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

The number of radial nodes in $3 {~s}$ and $2 {p}$ orbitals are respectively

Number of electrons in $- \mathrm{CON}{\mathrm{H}_2}$ are

Which of the following sets of quantum number are correct

a) $n = 1,\,l = 1,\,m = + 2$ b) $n = 2,\,l = 1,\,m = + 1$

c) $n = 3,\,l = 2,\,m = - 2$ d) $n = 3,\,l = 4,\,m = - 2$

The possibility of finding an electron in an orbital was conceived by:

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

Which of the following conclusions could not be derived from Rutherford’s $\alpha$ - particle scattering experiment

The number of electrons in an atom with atomic number 105 having $\left( {n + l} \right) = 8$ are:

In which one of the following pairs the two species are both isoelectronic and isotopic?
(Atomic numbers : ${Ca}=20, {Ar}=18, {~K}=19, {Mg}=12$, ${Fe}=26, {Na}=11$ )

Assertion: The speed of light depends upon the nature of the medium through which it passes.

Reason: When a ray of white light is passed through a prism, the wave with shorter wavelength bends less than the one with a longer wavelength.

If ${a}_0$ is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength $(\lambda)$ of the electron present in the second orbit of hydrogen atom? $[ n :$ any integer]

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

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