Which one is the wrong statement? - Chemistry MCQ NEET 2017 2026 | ExamTest.live | ExamTest.live

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Which one is the wrong statement?

A $de-Broglie's wavelength is given by λ = \frac{h}{m v}, where m = mass of the particle, v = group velocity of the particle$
B $The uncertainty principle is Δ E \times Δ t \geq \frac{h}{4 π}$
C $Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement$
D $The energy of 2 s orbital is less than the energy of 2 p orbital in case of Hydrogen like atoms$

Solution & Step-by-step Explanation

For hydrogen and hydrogen-like single-electron species (like He^{+}, Li^{2 +}), the energy of an orbital depends only on the principal quantum number n . Therefore, orbitals with the same n (like 2 s and 2 p) are degenerate (have equal energy).

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Which one is the wrong statement?

A

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

B

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

C

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

D

The energy of 2 s orbital is less than the energy of 2 p orbital in case of Hydrogen like atoms

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