Which one is the wrong statement?

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The uncertainty principle is $Δ E \times Δ t \geq \frac{h}{4 π}$

Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.

de-Broglie's wavelength is given by $λ = \frac{h}{m v},$ where m = mass of the particle, v = velocity of the partice.

The energy of 2s-orbita1 is less than the energy of 2p-orbital in case of hydrogen like atoms.

answer is C.

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Detailed Solution

For single electron system, E α n irrespective of ‘l’ values.
For unielectronic species, 2s=2p, 3s = 3p = 3d.
(1) According to Heisenberg uncertainty principle, the product of uncertainty conjugate pairs $\geq \frac{h}{4 π}$ . The conjugate pairs are:
i. $∆$ E and $∆$ T
ii. $∆$ X and $∆$ P
(where $∆$ represents uncertainty in measurements)
(2) More the exchange energy, less the energy that the system posseses. Less energy and less energy systems are more stable. More the symmetry, greater is the stability of the system.
(4) The de Broglie’s wavelength is given by $λ = \frac{n}{mv}$ , where m = mass of the particle, and v= velocity of the particle.