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NEET Chemistry QUESTION #7380
Question 1
Which of the following is a WRONG statement?
  • The uncertainty principle is \(\Delta E \cdot \Delta t \geq \dfrac{h}{4\pi}\)
  • Half-filled and fully filled orbitals are more stable due to exchange energy, symmetry, and balanced electron arrangement
  • In hydrogen-like atoms, the energy of the 2s orbital is less than that of 2p orbital✔️
  • de Broglie wavelength is \(\lambda = \dfrac{h}{mv}\) where \(v\) is the group velocity of the particle
Correct Answer Explanation
Analysis of option (3):
In hydrogen and hydrogen-like (one-electron) atoms, orbitals with the same \(n\) are degenerate — 2s and 2p have the same energy (energy depends only on \(n\)). The statement that 2s energy is less than 2p is only true for multi-electron atoms (due to penetration and shielding). Hence option (3) is wrong for hydrogen-like atoms.