List of top Chemistry Questions on Atomic Structure

Identify the molecule in which central atom is not obeying the octet rule.

Atomic numbers of four elements A, B, C and D are (Z-1), (Z+2), Z and (Z+1) respectively. If Z=9, the type of bonding between A and B is

In which of the following, the number of unpaired electrons is maximum?

The number of electrons with magnetic quantum number $m_{l} = 0$ in chloride ion is

The n, l values possible for a sublevel with seven degenerate orbitals are respectively

According to the mole concept in chemistry, what is the number of carbon atoms in 12 g of Carbon-12?

In a cathode ray experiment hydrogen gas was subjected to very low pressure and high voltage. The $\frac{e}{m}$ of cathode rays liberated was $-x~C~kg^{-1}$. In the second experiment helium gas was used under the same experimental conditions. What is the $\frac{e}{m}$ $(in~C~kg^{-1})$ of cathode rays liberated in the second experiment?}

The work function $(W_0)$ of metals A, B and C is 2.25, 2.42 and 3.7 eV respectively. These metals were irradiated with light of wavelength 400 nm. Identify the metals from which photoelectrons are emitted $(h = 6.6 \times 10^{-34} Js; c = 3 \times 10^8 ms^{-1}; 1 eV = 1.6 \times 10^{-19} J)$

If velocity of an electron in the first Bohr orbit is denoted by $v_0$, then the velocity ($v$) of the electron in other orbits (as a function of principle quantum number `n') is represented as:

tert-Butylbenzene reacts with 1-chloro-2-methylpropane in the presence of anhydrous $\text{AlCl}_3$. The major product in this reaction is:

Acetylene is passed through red hot iron tube at 873 K to produce P. P reacts with chlorine gas in the presence of anhydrous $\text{AlCl}_3$ to produce Q. Q reacts with benzyl chloride and sodium to produce R as the major product. The structure of R is:

Two students (P and Q) independently made three measurements (denoted by I, II, and III) of the same property. The expected correct value is 9.0. The observed values by the students are provided in the given table.

Based on the given data, the correct statement is:

Species that are both isoelectronic and isostructural are:

The compound that produces aromatic species upon deprotonation of the indicated hydrogen is:

If the radius of $_{13}\text{Al}^{27}$ nucleus is $3.6\text{ fm}$, then the number of neutrons in a nucleus of atomic number $29$ and radius $4.8\text{ fm}$ is:

Which of the following sets of molecules / ions represent isoelectronic species?

The threshold frequency of a metal is \(1.15 \times 10^{15}\) Hz. If electrons with kinetic energy of \(0.20\) eV are ejected when this metal surface is irradiated with photons of frequency '\(\nu\)', the value of \(\nu\) is (\(h=6.60 \times 10^{-34}\) Js, \(1\) eV \(=1.6 \times 10^{-19}\) J)

Which one of the following statements is not correct?

In which of the following, the number of bonding electrons and non-bonding electrons are in 3:2 ratio?

The four quantum numbers for the electron in the outermost orbital of potassium ($Z=19$) are

The angular momentum of an electron in an orbit $X$ of hydrogen atom is $\frac{2h}{\pi}$. Maximum number of orbitals possible in $X$ is

The pair of orbitals with electron density maximum along the axes is

Which one of the following statements is not correct?

In which of the following, the number of bonding electrons and non-bonding electrons are in \(3:2\) ratio?

The total number of electrons, protons and neutrons present in the three isotopes of hydrogen is