Multiple choice

In a laboratory, NaCl is made by burning Na in the atmosphere of Cl, which is yellow in colour. The yellow colour is due to the presence of

  1. electrons in the crystal lattice

  2. Na+ ions in the crystal lattice

  3. Cl- ions in the crystal lattice

  4. face-centred cubic crystal lattice

  5. gold in the crystal lattice

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A Correct answer
Explanation

In a laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine, which is yellow in colour. The cause of yellow colour is the presence of electrons in the crystal lattice.