Question:
Consider the following two statements
Statement--I: The order of energies of \(2s\)-orbitals of H, Li and Na is
\[
E_{2s}(\mathrm{H})<E_{2s}(\mathrm{Li})<E_{2s}(\mathrm{Na})
\]
Statement--II: The photoelectric effect explains the wave nature of light.
The correct answer is
Consider the following two statements
Statement--I: The order of energies of \(2s\)-orbitals of H, Li and Na is
\[
E_{2s}(\mathrm{H})<E_{2s}(\mathrm{Li})<E_{2s}(\mathrm{Na})
\]
Statement--II: The photoelectric effect explains the wave nature of light.
The correct answer is
Show Hint
- Photoelectric effect proves the particle nature of light.
- Increasing nuclear charge lowers (makes more negative) the orbital energy.
Updated On: Jul 9, 2026
- Both statements--I and II are correct
- Statement--I is correct but Statement--II is not correct
- Statement--I is not correct but Statement--II is correct
- Both statements--I and II are not correct \bigskip
Show Solution
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The Correct Option is D
Solution and Explanation
Step 1: Analyse Statement--I.
The energy of the \(2s\)-orbital becomes more negative with increasing atomic number.
Hence,
\[
E_{2s}(\mathrm{Na})<E_{2s}(\mathrm{Li})<E_{2s}(\mathrm{H})
\]
Therefore, Statement--I is incorrect.
Step 2: Analyse Statement--II. The photoelectric effect demonstrates the particle nature of light (photons), not its wave nature. Hence, Statement--II is also incorrect.
Step 3: Final conclusion. Both statements are incorrect. \[ \boxed{\text{Both Statement--I and Statement--II are not correct}.} \] Hence, the correct option is \(\boxed{(D)}\).
Step 2: Analyse Statement--II. The photoelectric effect demonstrates the particle nature of light (photons), not its wave nature. Hence, Statement--II is also incorrect.
Step 3: Final conclusion. Both statements are incorrect. \[ \boxed{\text{Both Statement--I and Statement--II are not correct}.} \] Hence, the correct option is \(\boxed{(D)}\).
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