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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Which one is the wrong statement?
  • A
    The uncertainty principle is $\Delta E \times \Delta t \geq \frac{h}{4\pi}$
  • B
    Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.
  • ✓
    The energy of $2s-$ orbital is less than the energy of $2p-$ orbital in case of hydrogen like atoms.
  • D
    de-Broglie's wavelength is given by $\lambda = \frac{h}{mv}$, where $m =$ mass of the particle, $v =$ group velocity of the particle.
✓

Answer

Correct option: C.
The energy of $2s-$ orbital is less than the energy of $2p-$ orbital in case of hydrogen like atoms.
c
In $H-$like atom energy of $2 s=2 \mathrm{p} $ orbital

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