Structure of atom practice · Mixed difficulty

Energy of atomic orbitals in a particular shell is in the order

The atomic number of an element is 35 and its mass is 81. The number of electrons in its outermost shell is

One require energy ${E_n}$ to remove a nucleon from a nucleus and an energy ${E_e}$ to remove an electron from the orbit of an atom, then:

The radius of first orbit of $\mathrm{H}$-atoms is $0.529\mathop {\text{A}}\limits^ \circ$. The radius of first orbit of $\mathrm{D}$-atoms should be

In unielectron system, the wave number of any spectral line is directly proportional to

If $n = 3,$ then which value of $'l'$ is correct

An atom having even number of electrons may be:

If ${S_1}$ be the specific charge (e/m) of cathode ray and ${S_2}$ be that of positive rays, then which is true?

Cathode rays carry/are

$\mathrm{Be}^{3+}$ and a proton are accelerated by the same potential, their de-Broglie wavelengths have the ratio (assume mass of proton = mass of neutron) :

A 100 watt bulb emits monochromatic light of wavelength 400 nm, the number of photons emitted per second by this bulb is

No two electrons can have the same values of …. quantum numbers.

Which of the following is not a fundamental particle?

Magnetic moments of $V(Z=23), \operatorname{Cr}(Z=24)$ and $\operatorname{Mn}(Z=25)$ are $x, y, z$. Hence

Calculate the wavelength of light required to break the bond between two chlorine atoms in a chlorine molecule. The $\mathrm{Cl}-\mathrm{Cl}$ bond energy is $243 \mathrm{KJ} / \mathrm{mol} .\left(h=6.6 \times 10^{-34} \mathrm{Js}\right)$

Which of the following pairs of nucleides are isodiaphers ?

Which of the following sets of quantum numbers is correct for an electron in 4f-orbital.

The ionisation enthalpy of hydrogen atom is $1.312 \times {10^6}\mathrm{Jmo}{\mathrm{l}^{ - 1}}$. The energy required to excite the electron in the atom from ${n_1} = 1\;\mathrm{to }\;{n_2} = 2$ is

Oxygen consists of ${\mathrm{O}^{16}},{\mathrm{O}^{17}}\mathrm{\;and\;}{\mathrm{O}^{18}}$ isotopes and carbon consists of isotopes of ${\mathrm{C}^{12}}$ and ${\mathrm{C}^{13}}$. Total number of $C{O_2}$ molecules possible are:

The electronic configuration of element with atomic number 24 is

A quantity of $1.0 \mathrm{~g}$ hydrogen atoms are excited to radiations. The study of spectra indicates that $45 \%$ of the atoms are in third energy level and $40 \%$ of atoms in second energy level and the rest in ground state. The total energy (in $\mathrm{kJ}$) evolved, when all the atoms return to ground state is (Ionization energy of hydrogen atom is $1310 \mathrm{~kJ} / \mathrm{mol}$)

The uncertainty in position and velocity of a particle are $10^{-11} \mathrm{~m}$ and $5.27 \times 10^{-24} \mathrm{~ms}^{-1}$, respectively. The minimum mass of the particle (in $\mathrm{kg}$ ) is

The electronic configuration of silver atom in ground state is:

If Rutherford would have used $\beta$-particles instead of $\alpha$-particles in his Gold-leaf experiment, which of the following observations would definitely not have been made:

Which set of quantum number are not possible

A 25 Watt bulb emits monochromatic yellow light of wavelength of $0.57 \mu \mathrm{m}$. What will be the rate of emission of quanta per second?

Total number of spectral lines in UV region, during transition from $5^{\text {th }}$ excited state to $1^{\text {st }}$ excited state

Assertion : Total number of orbitals associated with principal quantum number $n=3$ is 6 .

Reason : Number of orbitals in a shell equals to $2 n$.

An electron is accelerated from a very low velocity ($\sim$ zero speed) by the application of a potential difference of $\mathrm{V}$ volts. If the de Broglie wavelength should change (i.e., decrease) by $1.0 \%$ what percent increase in $\mathrm{V}$ causes it-

Pauli's exclusion principle states that