Sodium metal exhibits metallic luster. Which of the following explains this phenomenon?
- ADue to the diffusion of sodium ions
- BDue to the oscillation of loosely bound electrons
- CDue to the excitation of free protons
- DDue to the body-centered cubic lattice structure
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List-$I$ (Alloy) List-$II$ (Use) $A$. $Li-Pb$ $I$. In aircraft construction $B$. $Be-Cu$ $II$. To make bearings for motor engines $C$. $Mg-Al$ $III$. To make tetraethyl lead $D$. $Na-Pb$ $IV$. To make high strength springs
| List-$I$ (Alloy) | List-$II$ (Use) |
|---|---|
| $A$. $Li-Pb$ | $I$. In aircraft construction |
| $B$. $Be-Cu$ | $II$. To make bearings for motor engines |
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| $D$. $Na-Pb$ | $IV$. To make high strength springs |
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