When an alkali metal is dissolved in liquid ammonia, a dilute solution appears deep blue. What visual and magnetic change occurs if the concentration of the metal is significantly increased (e.g., abo

Question

When an alkali metal is dissolved in liquid ammonia, a dilute solution appears deep blue. What visual and magnetic change occurs if the concentration of the metal is significantly increased (e.g., above 3M)?

Prashant Kotian · Accepted Answer

Correct answer: B. In concentrated solutions of alkali metals in liquid ammonia, the solvated (ammoniated) electrons associate and pair up within solvent cages. This pairing quenches the paramagnetism (making it diamagnetic) and shifts the absorption spectrum, causing the solution to exhibit a characteristic metallic bronze color.

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