Question: the solution of alkali metal in liquid nh3 is blue coloured due to
[{'answer': 'the presence of solvated electrons', 'provenance': [{'wikipedia_id': '4459356', 'title': 'Solvated electron', 'start_paragraph_id': 2, 'start_character': 113, 'end_paragraph_id': 2, 'end_character': 147, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4459356', 'title': 'Solvated electron', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 663, 'bleu_score': 0.7421963653190251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10372365373137562760}, 'section': 'Section::::Abstract.'}]}]