NEET Practice Questions (MCQs) with Answers & Solutions

The energy of the hydrogen atom in its ground state (n=1) is -13.6 eV. The energy of the level corresponding to the quantum number n is given by E = (-13.6 eV)/n^2. For n=5, the energy will be (-13.6 eV)/5^2 = 0.54 eV.

Hund's rule states that for degenerate orbitals (orbitals with the same energy), the electrons occupy the orbitals in such a way that their spins are parallel, maximizing the total spin multiplicity. This rule is based on the principle of maximum multiplicity, which leads to greater stability.

According to the Heisenberg Uncertainty Principle, the position and momentum of a particle cannot be measured with absolute precision simultaneously. If the uncertainty in the position of an electron is zero, it implies that its position is known exactly, leading to an infinite uncertainty in its momentum.

The uncertainty in the position of a particle is given by the Heisenberg Uncertainty Principle: Δx * Δp ≥ h/4π, where Δx is the uncertainty in position, Δp is the uncertainty in momentum, and h is Planck's constant. Using the given values and the relation p = mv, the uncertainty in position is calculated to be 0.175 cm.

The radius of a hydrogen-like atom is inversely proportional to the nuclear charge (Z). For the Li2+ ion, Z = 3. Since the radius of the hydrogen atom is given as 0.53 Ã…, the radius of Li2+ in the ground state will be 0.53/3 = 0.17 Ã….

The splitting of spectral lines due to the influence of a magnetic field is known as the Zeeman effect. It is caused by the interaction between the magnetic dipole moment of the electron and the applied magnetic field.