Structure of atom practice · Mixed difficulty

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 $(n+\ell).$

STATEMENT-1 : $\gamma$-rays have very high penetrating power.

STATEMENT-2 : $\gamma$-rays are electromagnetic radiations of high energy.

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

The radius of first Bohr's orbit for hydrogen is $0.53 \mathop {\text{A}}\limits^ \circ$. The radius of third Bohr's orbit would be

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

The energy of a photon is inversely proportional to its

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

What will be the difference in mass number if the number of neutrons halved and the number of electrons double in ${{}_6{C^{12}}}$

According to Dalton, the smallest particle of matter which is indivisible, is called:

What is the trend of energy of Bohr’s orbits?

What is the ration of mass of an electron to the mass of a proton?

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

Given that in the H-atom the transition energy for $n = 1\,to\,n = 2$, 10.2eV, the energy for the same transition in $\mathrm{B}{\mathrm{e}^{3 + }}$ is:

Which of the following wave properties is proportional to
energy for electromagnetic radiation?

According to (n+l) rule after completing 'np' level the electron enters to:

An electron has a velocity of $300 \mathrm{~m} / \mathrm{sec}$ that is accurate to $0.01 \%$ with what accuracy can be locate the position of this electron :

The equation, $\lambda = \frac{h}{{mv}}$ was deduced by

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:

Statement (S): Humphrey series discovered in $\mathrm{H}$ atomic spectra has lowest energy radiations.

Explanation (E): The series belongs to $n_1=6.$

S-I: $\mathrm{Fe}^{+3}$ ion is less stable than $\mathrm{Fe}^{+2}.$

S-II : $\mathrm{Fe}^{+3}$ ion has less number of unpaired electrons than $\mathrm{Fe}^{+2}.$

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.

S-I: Line spectrum of $\mathrm{Li}^{+2}$ and $\mathrm{He}^{+}$are identical.

S-II: Isoelectronic species produce identical spectrum.

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]