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When an alkali metal dissolves in liquid...

When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change

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A dilute solution of alkali metal in `NH_3` has deep blue colour due to the formation of ammoniated electrons which absorb in the red region of visible light.
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A N EXCEL PUBLICATION-THE S-BLOCK ELEMENTS-QUESTION BANK
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  10. Starting with NaCl how would you proceed to prepare Na2CO3?

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