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Get Answers to all your Questions
- Home
- Engineering
- solution of Alkali metals in ammonia
- #Engineering
- #S - Block Elements (Alkali and Alkaline Earth Metals)
- #Chemistry
- #Joint Entrance Examination Main
Which of the following is true about the solution of sodium in ammonia? (1) It is colourless. (2) It is diamagnetic. (3) Both a and b (4) It is paramagnetic.
Answers (1)
The reason for the first option-
All alkali metal( Na, K, etc.) dissolves in liquid ammonia giving deep blue solutions which are conducting in nature. These solutions contain ammoniated cations and ammoniated electrons as shown below:
M + ( x + y ) NH3 → M+(NH3 )x + e-(NH3)y
The blue colour of the solution is considered to be due to ammoniated electrons which absorb energy corresponding to the red region of the visible light
For 2nd and 4th -
The solution is paramagnetic
the correct answer is 4
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