When an alkali metal is dissolved in liquid ammonia, a dilute solution appears deep blue. What visua — s Block Elements Chemistry Question
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)?
Answer: B
💡 Solution & Explanation
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.
💬Ask on WhatsApp →
Still have doubts about this question?
Send it to our AI chemistry tutor on WhatsApp — gets answered in minutes