AIIMS 2019 Chemistry Alkali Metals in Liquid Ammonia MCQ Question
Assertion : The alkali metal dissolves in liquid , giving deep blue solution. Reason : Blue colour of the solution is due to the ammoniated electron which absorbs energy in visible region of light.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The blue color of the solution in liquid ammonia arises from the presence of ammoniated electrons, which are electrons that become solvated by ammonia molecules, leading to their stabilization and excitation. This results in a characteristic blue hue due to their ability to absorb specific wavelengths of light. Option B, "solvated electron," is technically similar but less specific to ammonia, while option C, "free electron," does not account for the interaction with ammonia, and option D, "hydrated electron," is incorrect as it refers to electrons solvated by water (H₂O) rather than ammonia (NH₃). Understanding these distinctions is crucial for grasping the behavior of electrons in different solvent environments.
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