List of top Chemistry Questions on Quantum Numbers and Orbitals

The number of radial nodes in 3s and 2p orbitals, respectively are

Given below are two statements:}
Statement I:} In 30% (w/w) solution of methanol in CCl$_4$ (at $T$ K), the mole fraction of CCl$_4$ is equal to 0.33.
Statement II:} Mixture of methanol and CCl$_4$ shows positive deviation from Raoult's law.

The Bohr radius of a hydrogen like species is $70.53\,\text{pm}$. The species and the stationary state $(n)$ are respectively. (Given: Hydrogen atom Bohr radius is $52.9\,\text{pm}$).

Identify the correct statements from the following :}
A. Heisenberg uncertainty principle is applicable to electrons.
B. The size of $2p_x$ orbital is less than the size of $3p_x$ orbital.
C. The energy of $2s$ orbital of H atom is equal to the energy of $2s$ orbital of Li.
D. The electronic configuration of Cr is $[Ar] 3d^5 4s^1$

The first and second ionization constants of a weak dibasic acid $ H_2A $ are $ 8.1 \times 10^{-8} $ and $ 1.0 \times 10^{-13} $ respectively. 0.1 mol of $ H_2A $ was dissolved in 1L of 0.1 M HCl solution. The concentration of $ \text{HA}^- $ in the resultant solution is:

What is the energy (in J atom$^{-1}$) required for the following process?} \[ Li^{2+}(g) \rightarrow Li^{3+}(g) + e^{-} \] (Take the ionization energy for the H atom in the ground state as $2.18 \times 10^{-18}$ J atom$^{-1}$).

Given below are two statements:
Statement (I): For a given shell, the total number of allowed orbitals is given by $ n^2 $.
Statement (II): For any subshell, the spatial orientation of the orbitals is given by $ -l $ to $ +l $ values including zero. In the light of the above statements, choose the correct answer from the options given below:

Total number of electrons in chromium (Z = 24) for which the value of azimuthal quantum number (l) is 1 and 2.