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Chemistry · PYQ NEET UG 2018

हिन्दी

Which one is a WRONG statement?

  1. Total orbital angular momentum of electron in 's' orbital is equal to zero.
  2. An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
  3. The electronic configuration of N atom is \( \begin{array}{ccc} 1\text{s}^2 & 2\text{s}^2 & 2\text{p}_x^1 2\text{p}_y^1 2\text{p}_z^1 \\ \uparrow\downarrow & \uparrow\downarrow & \uparrow \uparrow \uparrow \end{array} \)
  4. The value of m for \( \text{d}_{z^2} \) is zero.

Correct answer · Option 3

The electronic configuration of N atom is \( \begin{array}{ccc} 1\text{s}^2 & 2\text{s}^2 & 2\text{p}_x^1 2\text{p}_y^1 2\text{p}_z^1 \\ \uparrow\downarrow & \uparrow\downarrow & \uparrow \uparrow \uparrow \end{array} \)

Explanation

Orbital angular momentum is given by \( \sqrt{l(l+1)}\frac{h}{2\pi} \). For an 's' orbital, \( l=0 \), so orbital angular momentum is zero. However, option C violates Hund's rule or shows incorrect pairing arrangement in the diagram representation.
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