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When metallic sodium is dissolved in liquid ammonia, a deep blue solution is produced. This blue colour arises because of the formation of:

1. solvated electron, e(NH3)x
2. solvated atomic sodium, Na(NH3)y
3. (Na+ + Na−)
4. NaNH2 + H2

Correct answer: solvated electron, e(NH3)x

Solution

The deep blue color in the solution is due to the presence of solvated electrons, which are free electrons that become stabilized by the surrounding ammonia molecules, allowing them to absorb specific wavelengths of light.

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