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The common salt, sodium chloride is an example for a crystal system with edge length a = b = c and axial angles α = β = γ = 90°.

1. Identify the crystal system. 

2. What happens when sodium chloride crystal is heated in presence of sodium?

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1. Cubic crystal

2. Gives yellow colour to the crystal due to F centre, ie. electron trapped anion vacancy. It is a metal excess defect.

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