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  3. The luster of a metal is due to

. The luster of a metal is due to

1. Its high density

2. Its high polishing

3. Its chemical inertness

4. Presence of free electron

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Ans: 4

Sol: The lustre of a metal is due to the presence of free electrons, they absorb small amounts of energy and get excited into higher energy levels which when de-excites releases energy in the form of light

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